JPH03288359A - Recording medium driving device control method and recording medium driving device - Google Patents

Abstract

PURPOSE:To continuously reproduce data by continuously obtaining data at a constant data rate while controlling a retry function when reading out the time sequential data at real time. CONSTITUTION:The time sequential data are read out from a CD-ROM 11 as a recording medium. When it is necessary to read out the data at real time, the retry function is controlled not be operated. An error detecting means executes the error detection processing or error detection correction processing of the read data and outputs a retry request instruction when detecting uncorrectable error. A microprocessor 122 inputs a retry necessity instruction from an external control equipment and the retry request instruction from the error detecting means and when the retry function is required, the data is controlled so as to be read out at high speed rather than the case of refusing the retry function.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a recording medium drive device having an error detection function or an error detection and correction function and a retry function for data read from a recording medium, and control of the recording medium drive device. It is about the method.

2. Description of the Related Art In recent years, personal computers, which are computers for individuals, have become popular, and the number of cases in which a personal computer is connected to a recording medium drive BE such as a fixed disk drive is increasing.

There is also a movement to use computers to handle audio and video information, and there is a trend toward using inexpensive, large-capacity recording media such as compact disc read-only memory (hereinafter referred to as C
It is called D-ROM. ) and optical video disk drive devices are also beginning to be controlled by computers.

As a conventional recording medium drive control method, for example, there is a fixed disk drive control method described in "Electronic Science J, May 1983 issue, pages 13 to 24.

The recording medium drive method disclosed in this publication has a fixed disk drive that has an error detection and correction function and a retry function, and can specify whether or not to enable the IJ) write function from an external control device. When controlling the device, the fixed disk drive was controlled to activate the retry function.

In addition, as a conventional recording medium drive device, for example, "Electronics" magazine February 1980 issue, pages 73 to 80
There is a CD-ROM drive described on the page. The CD-ROM drive device disclosed in this publication always played CD-ROMs at the same linear velocity as a music compact disc (hereinafter referred to as a CD), so the data transfer rate was constant (150 kilobytes). /second).

Problems to be Solved by the Invention However, in the recording medium drive control method as described above, time-series data is recorded on a recording medium, and when the data is read out, it is attempted to be processed at the same speed as the data reading speed. In this case, if a data error occurs, the retry function is activated, resulting in a problem that data that should be reproduced continuously on the time axis is not reproduced continuously.

In addition, since the recording medium drive device described above always plays back a CD-ROM at the same linear velocity as a CD, for example, program data does not need to be continuous on the time axis, and the time required for playback is shortened. Even when reproducing data for which the shorter the better, the problem is that it takes a considerable amount of time.

In view of the above, the present invention makes it possible to read out data continuously on the time axis even if a read error occurs when reading out time-series data recorded on a recording medium in real time. It is an object of the present invention to provide a recording medium drive control method and a recording medium drive that can vary the data transfer rate depending on the application.

Means for Solving the Problems The recording medium drive control method of the present invention provides a retry function when data read from a recording medium is time-series data and needs to be read in real time. The recording medium drive device of the present invention is characterized in that the recording medium drive device of the present invention includes a reading means for reading and outputting data from a recording medium, and an error detection process or an error detection and correction process for the read data. error detection means that outputs a retry request command when an uncorrectable error is detected, inputs a retry necessity command from an external control device and a retry request command from the error detection means, and when the retry function is required. The apparatus is characterized in that it includes at least a control means for controlling the reading means to read data at a higher speed than when the retry function is disabled.

Operation The recording medium drive control method of the present invention uses the method described above to control the recording medium drive when the data read from the recording medium is time-series data and needs to be read in real time. The recording medium drive device of the present invention can obtain data continuously at a constant data rate at all times, and due to the above-described configuration, the recording medium drive device of the present invention can obtain data at a high transfer rate when a retry function is required.

EXAMPLE Hereinafter, a first example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a CD-ROM drive device that is a recording medium drive device in a first embodiment of the present invention and a personal computer that is an external control device that controls the device, and FIG. CD as a medium
ROM format diagram, Figure 3 is C in the same embodiment.
FIG. 4 is a schematic diagram showing the relationship between audio data recorded in a D-ROM and audio reproduced by this audio data. FIG. 4 is a format diagram of a data read command sent from a personal computer to a CD-ROM drive.

In FIG. 1, 11 is a recording medium, CD-ROM1.
12 is a CD-ROM drive device which is a recording medium drive device;
13 is a personal computer that controls the CD-ROM drive unit [12; 14 is an amplifier that amplifies the audio signal; 15
is a speaker that outputs an acoustic signal as audio.

In the CD-ROM drive device 12, 121 is a microprocessor that receives instructions from the personal computer 13 and controls the entire CD-ROM drive device 12;
123 is a servo circuit that controls the spindle motor 123 and the pickup 124, 123 is a spindle motor that rotates the CD-ROMI 1, and 124 is a servo circuit that controls the CD-ROMI 1 by optical means.
- A pickup that reads data from the ROM 11 and outputs an analog electrical signal; 125 is a waveform shaping circuit that shapes the analog electrical signal output from the pickup 124 into a pulse signal; 126 is an input for the pulse signal output from the waveform shaping circuit 125; , EFM (Eight t
o Fourteen MO-du la t
ton) A synchronization detection circuit that detects a synchronization pattern added to a modulated frame; 127 is a waveform shaping circuit 12;
PLL (Phase Locked Lo
128 is a reference clock generation circuit that sends a reference clock to the servo circuit 122;
129 is a digital signal processing circuit that performs EFM demodulation, error detection and correction on the data output from the synchronization detection circuit 126, and outputs the data; 1210 is a digital signal processing circuit 128;
A CD-ROM signal processing circuit detects the synchronization pattern of the CD-ROM frame from the data output from the data, performs error detection and correction as necessary, and outputs the data; 1211 is a host interface circuit that exchanges data with the personal computer 13; It is.

In the personal computer 13, 131 is a microprocessor that calculates data and instructs each part;
2 is a memory for recording various digital data, 133 is C
C that exchanges data with the D-ROM drive device 12
D-ROM interface circuit, 134 is CD-ROM
The channel number of the data sent via the interface circuit 133 is determined and the microprocessor 131
135 is a CD-ROM data processing circuit that transfers the data of the channel designated to the designated location;
The digital audio data sent from the ROM data processing circuit 134 is temporarily stored, and interpolation processing is performed as necessary.
This is a digital-to-analog conversion circuit that converts into analog audio signals at predetermined timing.

In FIG. 2, (a) is a format diagram of a frame, which is the minimum unit of recording, 21 is a subcode (1 byte) indicating the frame address, etc., and 22 is user data such as audio data (24 bytes). , 23 is an error detection and correction code (8 bytes) for detecting and correcting errors in the user data 22. (b), (c),
(d) and (e) are format diagrams of a CD-ROM frame, which is a unit of access to a CD-ROM.

(b) is a format called mode 0, and 24 is a C
A synchronization pattern indicating the beginning of the D-ROM frame, 25 a header indicating the address of the CD-ROM frame, etc.
6 is an area where the recorded data is 0. (C) is a format called mode 1, 24.25.26
is the same as mode 0 in (b), 27 is user data such as image data or a computer program, 28 is an error detection code used to detect errors in the user data 27, and 29 is an error detection code for detecting errors in the user data 27. This is an error correction code used for correction. (d) is mode 2
．． In a format called Form 1, 24.25.
27°28.29 is the same as mode 1 in (c), and 2
1O is a subheader indicating the type of data recorded as the user data 27, the channel number, etc. (e)
is mode 2. In a format called Form 2, 2
4.25.27.210 is mode 2 of (d). This is the same as form 1, and 211 is a reserved area for future expansion, and in this embodiment, O is recorded.

In FIG. 3, the horizontal axis is time, indicating that 4/75 seconds of audio can be reproduced by data output in 1/75 seconds.

In FIG. 4, 41 indicates the format of a data read command sent to the CD-ROM drive 12. 42
indicates the format of the control byte in format 41. 43 and 44 indicate that the CD-ROM interface circuit 138 outputs C during the play command and read command, respectively.
This is an example of a data read command sent to the D-ROM drive device 12.

Hereinafter, a description of the CD-ROM 11, which is the recording medium of this embodiment, an explanation of the data read command sent from the personal computer 13 to the CD-ROM drive device 12, and a description of the CD-ROM 11, which is the recording medium of this embodiment, will be explained.
The explanation will be given in the order of operations of the personal computer 13 and the CD-ROM drive device 12 when reading data from the ROM II.

First, the CD-ROM, which is the recording medium of this embodiment, will be explained in the following order: the data format of the CD-ROM, and then the data recorded on the CD-ROMI 1 in this embodiment.

First, the data format of the CD-ROM will be explained. CD-ROM is a recording medium that records audio information.
D records digital data such as those used by computers.

When recording digital data on a CD-ROM, the following processing is performed.

First, the digital data to be recorded is divided into predetermined sizes, and then an address (recorded in the header 25) and a synchronization pattern 24 are added, and an error detection code 28. A block structure is created by adding an error correction code 29 and a channel number (recorded in the subheader 210). The block structuring method is shown in Figure 2 (b) and (c).
There are four types shown in , (d), and (e). One block of digital data structured into a block structure using either method is called a CD-ROM frame. one C
The size of a D-ROM frame is 2352 bytes.

Second, the CD-ROM frame is divided into subcodes 2 and 2.
1 and an error detection and correction code 23, the second
A frame shown in Figure (a) is formed.

That is, the CD-ROM frame is divided into 12 bytes each from the beginning, and error detection and correction codes 23 are added at a ratio of 8 bytes to 24 bytes, and 1 byte is added for each two pieces of data to which error detection and correction codes 23 are added. Subfood 21
A frame is formed by adding . As a result, one CD-ROM frame is divided into 98 consecutive frames (2352 C bytes/CD-ROM
M frame code ÷ 24 [bytes/frame code]. Below, the frame is EFM modulated, a synchronization pattern is added, and C
It is recorded on a D-ROM disk. In a CD, audio data with a sampling frequency of 44.1 KHz and a quantization bit count of 16 bits is recorded in user data 22° of a frame. Therefore, the time required to play one frame from a CD disc is 1/7350 second (1
÷ (44100 [samples/sec] x 18 [bits/sample channel code x 2 [channel code ÷ 8 [bit/s]
bytes] ÷ 24 [bytes/frame])). One C when playing a CD-ROM disc at the same speed as a CD
The time required to play a D-ROM frame is 1/75th
seconds (1 ÷ (7350 [frames/sec) ÷ 98 [frames/CD-ROM frames]).

Next, data recorded on the CD-ROMI 1 in this embodiment will be explained. In this example, four channels of audio signals are each nonlinearly quantized with a sampling frequency of 37.8 KHz and a quantization bit count of 8 bits, separated into 2016-byte units, and the conditions for quantization of 20 bytes of 0 and 288 bytes are set. Both data shown are for mode 2. It is time-divisionally recorded in the format of Form 2 (FIG. 2(e)). However, the audio data obtained as a result of the analog-to-digital conversion process is a number excluding hexadecimal FF. The FF is used for later error processing. The audio data recorded on one CD-ROM frame is 2016 bytes, and one CD-ROM frame has 2016 bytes of audio data.
-The time during which an acoustic signal can be played back using the acoustic data recorded in a ROM frame is 4/75 seconds (201B[
Byte/CD-ROM frame] ÷ (37,800 m samples/second x 1 [Byte/CD-ROM frame)). This is four times the time required to play just one CD-ROM frame. The four channels of audio data are arranged as shown in FIG. As a result, if a CD-ROM disk or disc is played back at the same speed as when playing a CD, a CD-ROM disc containing audio data of the same channel will be played back.
The OM frame is stored in a CD-ROM every 4/75 seconds.
read from the disc, resulting in multiple CD-ROMs
One channel of audio signals recorded in a frame can be played back continuously.

Next, CD-ROM from Burnal Computer 13
The data read command sent to the drive device 12 will be explained.

In this embodiment, the personal computer 13 has 41
The CD-ROM drive device 12 is controlled using a data read command consisting of 6 bytes of data shown in FIG. 0th
The byte is an instruction identification code, and cooootooo (binary number) indicates that this instruction is a data read instruction. The upper three bits of the first byte are the logical unit number, which indicates that multiple CDs can be stored in one personal computer.
-When a ROM drive is connected, which CD-R
Indicates whether data is to be read from the OM drive device. The lower five bits of the first byte, the second byte, and the third byte are logical addresses that point to the first CD-ROM frame to be read. The fourth byte is the data block number and indicates the number of CD-ROM frames to be read. The fifth byte is a control byte and is defined as shown at 42. The 7th bit is a retry bit and specifies whether or not to activate the retry function. When this bit is set to 0, the retry function of the CD-ROM drive device 12 is activated.

Next, the personal computer 13 and the CD-ROM drive device 12 when reading data from the CD-ROM II.
Regarding the operation of the personal computer 13 CD-
The explanation will be given in the following order: the ROM drive device control method and the operation of the CD-ROM drive device 12.

A method of controlling the CD-ROM drive of the personal computer 13 will be explained. The personal computer 13 of this embodiment is provided with a play command and a read command as commands for reproducing a CD-ROM, and both are used depending on instructions from the outside. Play instructions are from CD-ROM
A command to directly send the audio data read from the disk to the digital-to-analog conversion circuit 135 and continuously reproduce audio, with a logical unit number as an argument.

Logical addresses, data block numbers, and channel numbers are used. The read command is a command to transfer acoustic data read from the CD-ROM to the memory 132, and takes a logical unit number as an argument.

A logical address, number of data blocks, channel number, and transfer destination address are used.

In either case of a play command or a read command, the microprocessor 131 creates a 6-byte data read command shown at 41, and sends it to the CD-ROM interface circuit 133.
The data is sent to the CD-ROM drive device 12 via the. At this time, if the command is a play command, the retry bit is set to 1, ie, no retry is performed, and if the command is a read command, the retry bit is set to 01, ie, the retry is performed.

An example of a data read command sent to the CD-ROM drive unit 12 is shown in 43.44. Reference numeral 43 is an instruction for playing data of "logical unit number 01, logical address 100, data block number 255, channel number 1", and 44 is an instruction for reading.

The microprocessor 131 is the CD-ROM drive device 12
At the same time as sending a data read command to the CD-ROM
For the data processing circuit 134, the channel number of the channel to be processed and the transfer destination of the sent data, that is, in the case of a play command, the digital-to-analog conversion circuit 134
, in the case of a read command, specifies a continuous area from the specified address in the memory 132.

The data read from the CD-ROMI 1 by the data read command is sent to the CD-ROM interface circuit 1.
33 to the CD-ROM data processing circuit 134. The CD-ROM data processing circuit 134 checks the channel number and sends the data of the channel matching the specified channel number to the digital-to-analog conversion circuit 134 in the case of a play command, and to the memory 1 in the case of a read command.
The data is transferred to a continuous area starting from the specified address within 32.

In the case of a play command, the CD-ROM drive device 12 (described later)
As a result of this operation, the user data 27 in the CD-ROM frame is sent from the CD-ROM drive device 12 every 1775 seconds. Also, since CD-ROM frames are recorded on the CD-ROM II in the arrangement shown in Figure 3, data for a specified channel appears every 4/75 seconds.
The signal is sent to the digital-to-analog conversion circuit 135. The digital-to-analog conversion circuit 135 temporarily stores the received audio data, reads it out at predetermined timing, expands the time axis, converts it into an analog audio signal of 4/75 seconds, and outputs it. At this time, the value of the acoustic data is 16
If it is FF in decimal notation, it is determined that there is an error in the data, and after performing previous value interpolation, digital-to-analog conversion processing is performed.

The analog audio signal output from the digital-to-analog conversion circuit 135 is amplified by the amplifier 14 and output as audio by the speaker 15.

In the case of a read command, the data of the designated channel is sent from the CD-ROM drive 12 at twice the speed of the play command, and is transferred to a continuous area from the transfer destination address in the memory 132.

Next, the operation of the CD-ROM drive device 12 will be explained.

The PLL circuit in the clock extraction circuit 127 used here has center frequencies of 4.3218MHz and 8.6438MHz.
Two voltage controlled oscillators z are built-in and can be switched by the microprocessor 121.

Further, the reference clock generation circuit 128 has 4.3218M
It has two oscillators of Hz and 8.6438 MHz, which can also be switched by the microprocessor 121. Furthermore, the digital signal processing circuit 129 and the CD-
The ROM signal processing circuit 1210 sends a retry request signal to the microprocessor 1 when an uncorrectable error is detected.
21, and the value of the error data is sent to FF in hexadecimal.
or replace the frame or CD with the error.
- The ROM frame data is not output, and this can also be switched by the microprocessor 121.

A data read command from the personal computer 13 is sent to the microprocessor 121 via the host interface circuit 1211. microprocessor 12
1 interprets the sent data read command, and if the retry bit is 1, that is, it is instructed not to retry, the speed is the same as the CD (linear speed is about 1.25 m).
/second), and if the retry bit is 0, that is, a retry is instructed, the data is read at twice the speed of the CD (linear velocity is approximately 2.5 m/sec).
control the entire system so that data is read from CD-ROMI 1 in seconds).

First, the case where retry is not performed will be explained. The microprocessor 121 uses a voltage controlled oscillator with a center frequency of 4.3218 MHz for the clock extraction circuit 127, and generates a reference clock of 4.3218 MHz for the reference clock generation circuit 128. Digital signal processing circuit 129 and CD-ROM
When an uncorrectable error occurs, the signal processing circuit 1210 is instructed to replace the data in which the error occurred with a hexadecimal FF.

Thereafter, the microprocessor 121 controls the servo circuit 122
is controlled to read data in the section specified by the logical address and data block number of the data read command. The servo circuit 122 performs focus servo, traverse servo, and tracking servo on the pickup 124, and receives two clocks input to the servo circuit 122, namely, the regeneration lock output from the clock extraction means 127 and the output from the reference clock generation circuit 128. The spindle servo is performed so that the frequency of the reference clock used matches the frequency of the reference clock. The pickup 124 picks up C by optical means.
Reads data from D-ROM and outputs it as an analog electrical signal. The analog electrical signal output from the pickup 124 is converted into a pulse signal by the waveform shaping circuit 125, and then sent to the synchronization detection circuit 126 and the clock extraction circuit 12.
7 is input. The clock extraction circuit 127 inputs the pulse signal from the waveform shaping circuit 125 and creates a reproduced clock based on the center frequency of the voltage controlled oscillator in the built-in PLL circuit.
．． A digital signal processing circuit 129 is supplied to a CD-ROM signal processing circuit 1210.

The synchronization detection circuit 126 detects a synchronization pattern added to the EFM modulated frame, and sends the EFM modulated frame to the digital signal processing circuit 129. After the EFM demodulation of the frame, the digital signal processing circuit 128 uses the error detection and correction code 23 to process the user data 2 in the frame.
2 error detection is performed, and the user data 22 is stored in the CD-ROM.
The signal is sent to the signal processing circuit 1210. The CD-ROM signal processing circuit 1210 performs synchronization pattern 2 of the CD-ROM frame.
4 is detected and an error detection code 28. Error detection and correction processing is performed using the error correction code 29, and the subheader 210. User data 27 is sent to personal computer 13 via host interface circuit 1211.

If an uncorrectable error is detected in the digital signal processing circuit 129 or the CD-ROM signal processing circuit 1210, the FF is sent to the personal computer 13 in hexadecimal format. The microprocessor 121 also includes a digital signal processing circuit 129 or a CD-ROM signal processing circuit 12.
Ignore the retry request signal sent from 10.

As a result of the above, if retry is not performed, by setting the reference clock and reproduction clock to 4.3218MHz, CD-ROMI 1 can achieve the same linear velocity as CD, 1.25m/
The user data 27 in the CD-ROM frame is transmitted to the personal computer 13 every 1775 seconds.

Next, a case in which a retry is performed will be explained.

If the retry bit of the input data read command is O, the microprocessor 121 determines that a retry is to be performed, switches the voltage controlled oscillator of the PLL circuit in the clock extraction circuit 127 to one with a center frequency of 8°8438 MHz, and , 8 for the reference signal generation circuit 128
．． Instructs to generate an 8438MHz reference clock. Furthermore, a digital signal processing circuit 129, a CD-R
When an uncorrectable error occurs, a retry request signal is sent to the OM signal processing circuit 1210 to instruct it not to output the frame in which the error occurred or the data of the CD-ROM frame.

Below, the digital signal processing circuit 129 or CD-ROM
The operation when no uncorrectable error is detected in the signal processing circuit 1210 is the same as when no retry is performed. However, the servo circuit 122 is the clock extraction circuit 12
The spindle motor is controlled so that the frequency of the regenerated clock outputted by 7 and the reference clock are the same, and since both the reference clock and the regenerated clock are twice the frequency of when no retry is performed, the data is the same as when no retry is performed. 2
Reads out twice as fast.

Uncorrectable errors occur in the digital signal processing circuit 129 or CD
- When detected by the ROM signal processing circuit 1210, the detected circuit transmits the IJ) write request signal to the microprocessor 1.
21, and the microprocessor 121 controls the servo circuit 122 to read the CD-ROM frame in which the error has been detected. This causes a retry.

As described above, according to the recording medium drive control method of this embodiment, when the data read from the recording medium is time-series data such as audio data and it is necessary to read it in real time. By controlling the retry function so that it does not work, interruption of data playback due to retry can be prevented.

The recording medium drive device of the present invention also includes a reading means (servo circuit 122. spindle motor 123. pickup 124. waveform shaping circuit 125. clock extraction circuit 127. reference clock generation circuit 128) that reads and outputs data from the recording medium. , error detection means (digital signal processing circuit 129, CD-ROM signal processing circuit 1210) that performs error detection processing or error detection and correction processing on the read data and outputs a retry request command when an uncorrectable error is detected. ), the retry necessity command from the external control device, and the retry request command from the error detection means.
A control means (microprocessor 121) characterized in that when an external control device instructs the retry function to operate, the reading means is controlled to read data at a higher speed than when instructed not to operate the retry function. By providing the retry function, data can be read out faster when the retry function is instructed to operate than when it is instructed not to operate.

A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 5 is a block diagram of a CD-ROM drive device that is a recording medium drive device in a second embodiment of the present invention and a personal computer that is an external control device that controls the device, and FIG. FIG. 2 is a format diagram of a data read command sent from a personal computer to a CD-ROM drive.

In FIG. 5, 11.14.15 are similar to those in the first embodiment. 52 is a CD-ROM drive device which is a recording medium drive device in the second embodiment, and 53 is a personal computer which is an external control device in the second embodiment.

In the CD-ROM drive device 52, 122-126.
129.1210.1211 are similar to those in the first embodiment. 521 is a CD-ROM in the second embodiment
a microprocessor 52 that controls the entire drive 52;
7 is a clock extraction circuit in the second embodiment, and 528 is a reference clock generation circuit in the second embodiment.

In the personal computer 53, 132 to 135
is similar to the first embodiment. 531 is a microprocessor in the second embodiment.

In FIG. 6, 61 indicates the format of the data read command sent to the CD-ROM drive 52. 62
indicates the format of the control byte in format 61. 83. f34 is an example of a data read command in which the retry function is activated and high-speed read is performed or not.

The second embodiment will be explained below in the order of explanation of the data read command and explanation of the operations of the personal computer 53 and the CD-ROM drive device 52.

First, the data read command will be explained.

61 is the 4th byte except for the 5th byte (control byte)
It has the same meaning as the data read command shown at 41 in the figure. The fifth byte is defined as shown in 62, and the seventh byte is defined as shown in 62.
The bit is a retry bit similar to the first embodiment, and the sixth bit is a data read speed bit, which specifies the data read speed when the retry function is essential. When this bit is 0, data is read from the CD-ROM faster than when it is 1. In this embodiment, a CD-ROM described later is used.
Due to the operation of the drive device 52, when this bit is set to O, the data read speed is 3 times that when the retry function is disabled.
CD-ROMI with double the data read speed
1 is played.

Next, an explanation of the operation of the personal computer 53 and a CD
,-ROM drive unit! 52 will be explained below.

First, the operation of the personal computer 53 will be explained.

Microprocessor 5 in personal computer 53
31 generates read commands and play commands similarly to the microprocessor 131 of the first embodiment. However, when generating a read command, the time that can be spent processing the data read from the CD-ROM is calculated, and the
- Specify the data read speed from the ROM. The data read speed is specified by manipulating the data read speed bit shown at 62 in FIG. 63 and 6t4 in FIG. 6 show data read commands for reading data of "logical unit number 01, logical address 1001, number of data blocks 255, channel number 1". Here, 63 is a data read command when the microprocessor 531 has a margin, and 64 is a data read command when there is no margin. Hereinafter, the personal computer 53 operates in the same manner as in the first embodiment, and the CD-RO
The data sent from the M drive device 52 is output as audio in the case of a play command, and is stored in the memory 132 in the case of a read command.

Next, the CD-ROM drive device 52 will be explained. The PLL circuit in the clock extraction circuit 527 used in this example has center frequencies of 4.3218 MHz and 8.6436 MHz.
and 12.9E! Three 54 MHz voltage controlled oscillators are built in, and can be switched by a microprocessor 521. Further, the reference clock generation circuit 528 used in this embodiment has an oscillation frequency of 4.3218MH.
z and 8°C343BMHz and 12.9654MHz 3
It has two oscillators, which are also microprocessor 5
It can be switched at 21.

A data read command from the personal computer 53 is sent to the microprocessor 521 via the host interface circuit 1211.

The microprocessor 521 interprets the sent data read command and controls the entire CD-ROM drive 52 as shown below. When the retry bit is 1,
That is, when retrying is not performed, the data read speed bit is ignored and data is read from the CD-ROM 11 by performing the same operation as in the first embodiment. When the retry bit is 0, that is, retry is to be performed, the digital signal processing circuit 129 and the CD-ROM signal processing circuit 1210
On the other hand, when an uncorrectable error is detected, it instructs not to output the data of the frame with the error or the CD-ROM frame, and also checks the data read speed bit and controls the voltage controlled oscillator in the clock extraction circuit 527. The center frequency and the oscillation frequency of the oscillator in the reference clock generation circuit 528 are switched. Data read speed bit is O
In the case of , both the center frequency and oscillation frequency are 12.985
8 for 4MHz11. Switch to Ei43E3MHz. As a result, the reproduced clock and the reference clock are set to 12.9654 MHz and 8.6436 MHz, respectively. Below, the servo circuit 122. spindle motor 1
23. Pickup 1241 Waveform shaping circuit 125. Synchronization detection circuit 126. Digital signal processing circuit 129. CD
-ROM signal processing circuit 1210. The host interface circuit 1211 operates in the same manner as in the first embodiment, and the subheader 210 and user data 27 are output to the personal computer 53.

As a result of the above operation, the CD-ROM drive device 51 operates at the same linear velocity as the CD when the retry bit is 0, and when the retry bit is 0 and the data read speed bit is 0, the CD-ROM drive device 51 operates at
If the linear velocity is three times that of D, the retry bit is O, and the data read speed bit is 1, the linear velocity is twice that of CD.
Read data from D-ROM11.

As described above, according to this embodiment, by instructing the data read speed when performing a retry from the external control device (personal computer 53) using read speed information (data read speed bit), the recording medium drive device It is possible to realize a recording medium drive device that reads data from a recording medium at a transfer rate that is optimal for the processing capacity of an external control device that controls the storage medium, and it is possible to read data from a recording medium without waste.

A third embodiment of the present invention will be described below with reference to the drawings.

FIG. 7 is a block diagram of a CD-ROM drive device that is a recording medium drive device in a third embodiment of the present invention and a personal computer that is an external control device that controls the device. FIG. 3 is a formant diagram of a data read command sent from a computer to a CD-ROM drive.

In FIG. 7, 14.15 is the same as in the first embodiment. 71 is a CD-ROM which is a recording medium in the third embodiment, 72 is a CD-ROM drive which is a recording medium drive device in the third embodiment, and 73 is a personal computer which is an external control device in the third embodiment. It's a computer.

In the CD-ROM drive device 72, 122 to 128,
129.1210.1211 are similar to those in the first embodiment. 721 is a CD-ROM in the third embodiment
a microprocessor 72 that controls the entire drive 72;
7 is a clock extraction circuit in the third embodiment, and 728 is a reference lock generation circuit in the third embodiment.

In the personal computer 73, 132 to 135
is similar to the first embodiment. 731 is a microprocessor in the third embodiment.

In FIG. 8, reference numeral 81 indicates the format of a data read command sent to the CD-ROM drive device 72. 82
indicates the format of the control byte in format 81. 83 and 84 are examples of data read commands for cases in which the retry function is not activated and high-speed read is performed and cases in which the data read is not performed.

Hereinafter, a description of the CD-ROM 71 for the third embodiment,
Explanation of the data read command sent to the CD-ROM drive device 72, explanation of the operation of the personal computer 73, C
The operation of the D-ROM drive device 72 will be explained in order.

First, the CD-ROM 71 will be explained. In the CD-ROM 71 used in this embodiment, two types of audio data obtained by two types of analog-to-digital conversion methods are recorded. The first analog-to-digital conversion method is the same method as in the first embodiment, and is non-linear quantization with a sampling frequency of 37.8 KHz and a quantization bit number of 8 bits. Another analog-to-digital conversion method is a sampling frequency of 37.8KH.
This is non-linear quantization with z1 quantization bits of 4 bits.

The audio data converted from analog to digital using these methods is stored on a CD-ROM in the same manner as in the first embodiment.
recorded in That is, mode 2, form 2 is divided into 2016-byte units, with 20 bytes of O and 288 bytes of data indicating the quantization conditions (Fig. 2 (e)).
It is stored in a CD-ROM frame in this format and recorded on a time-division basis. At this time, the channel numbers assigned to each audio data are 0 and 1 for audio data with a quantization bit number of 8, and 2 and 3 for audio data with a quantization bit number of 4. As a result, with the former analog-to-digital conversion method, the time that an analog audio signal can be played back from the audio data recorded on one CD-ROM frame is 47.
76 seconds (same as the first embodiment), and 8775 seconds in the latter analog-to-digital conversion method (sampling frequency is the same, but the number of quantization bits is half). Also, this CD-ROM7
1 is played back at the same playback speed as a CD, CD-ROM frames recording audio data of the same channel number will be read out from the CD-ROM 71 every 4/75 seconds.

Next, a description of the data read command sent to the CD-ROM drive device 72 will be explained. 81 has the same meaning as the data read command 41 shown in FIG. 4 except for the fifth byte (control byte). The 5th byte is 8
The seventh bit is a retry bit similar to the first embodiment, and the sixth bit is a data read speed bit, which specifies the data read speed when the retry function is disabled. 1 when this bit is O
Read data from a CD-ROM faster than when

In this embodiment, due to the operation of the CD-ROM drive device 72, which will be described later, when this bit is set to 0, the data readout speed is the same as when playing a CD, and when this bit is set to 1, the data readout speed is half that of the time when a CD is played back. be done.

Next, the operation of the personal computer 73 will be explained. A microprocessor 731 in the personal computer 73 generates read commands and play commands similarly to the microprocessor 131 in the first embodiment. However, when a play command is issued, a data read speed is also specified. That is, when playing audio data with channel number O or 1, it is instructed to play it at the same speed as the CD playback speed, and when playing audio data with channel number 2 or 3, it is instructed to play it at half the speed of the CD. instruct them to do so. The data read speed is specified by manipulating the data read speed bit shown at 82 in FIG. "Logical unit number is 01 Logical address is 10
01 The data read command when playing data with a data block number of 255 and a channel number of 1 is shown at 83 in FIG. 84 shows a data read command when playing the data of ".". Hereinafter, the personal computer 73 operates in the same manner as in the first embodiment, and the CD-ROM
The data sent from the drive device 72 is output as a voice in the case of a play command, and is output as a voice in the case of a read command.
Store in 32. When playing data with channel number 0.1, CD-ROM frames with the same channel number are
Appears every 4775 seconds. Since 4/75 seconds of sound can be played back using the sound data recorded on one CD-ROM frame, the sound can be played back without interruption. When playing audio data with channel numbers 2 and 3, CD-ROM frames with the same channel numbers are
Due to the operation of the M drive device 72, it appears every 8/75 seconds.

Since 8775 seconds of audio can be played back with the audio data recorded on one CD-ROM frame, the audio can be played back without interruption.

Next, the operation of the CD-ROM drive device 72 will be explained. P in the clock extraction circuit 527 used in this embodiment
The center frequency of the LL circuit is 2.1Ei09MHz and 4.3
Three voltage controlled oscillators of 218 MHz and 8.8436 MH2 are built in, and can be switched by the microprocessor 721. Further, the reference clock generation circuit 728 used in this embodiment has an oscillation frequency of 2.1
809MHz, 4.3218MHz and 8.8438MH
It has three oscillators of z, which can also be switched by the microprocessor 721.

A data read command from the personal computer 73 is sent to the microprocessor 721 via the host interface circuit 1211.

The microprocessor 721 interprets the sent data read command and controls the entire CD-ROM drive 72 as shown below. When the retry bit is O,
In other words, when performing a retry, the data read speed bit is ignored and the same operation as in the first embodiment is performed to read the CD.
- Controls the whole to read data from ROMI 1. When the retry bit is 1, that is, no retry is performed, the digital signal processing circuit 129 and CD-ROM signal processing circuit 1210 are instructed to replace the erroneous data with a hexadecimal FF when an uncorrectable error is detected. In addition, the data read speed bit is checked, and the center frequency of the voltage controlled oscillator in the clock extraction circuit 727 and the oscillation frequency of the oscillator in the reference clock generation circuit 728 are switched. If the data read speed bit is O, both the center frequency and oscillation frequency are 4.3218M
In the case of Hz11, switch to 2.1609MHz. As a result, the reproduced clock and the reference clock are each set to 4.
It is set to 3218MHz or 2.1609MHz. Below, the servo circuit 122. Spindle motor 123
．． Pickup 124. Waveform shaping circuit 125. Synchronization detection circuit 126. Digital signal processing circuit 129. CD-RO
The M signal processing circuit 1210 and the host interface circuit 1211 operate in the same manner as in the first embodiment, and the subheader 2
10 and user data 27 are stored in the personal computer 53
is output to.

Through the above operations, the CD-ROM drive device 72 operates at twice the CD linear velocity when the retry bit is O, and at CCD when the retry bit is 1 and the data read speed bit is O.
If the retry bit is 1 and the data read speed bit is 1 at a linear velocity half that of D, the linear velocity is the same as that of a CD.
-Read data from ROM71. For this reason, CD-
Subheader 210 within the ROM frame. User data 27 is sent to the personal computer 73 every 2/75 seconds when no retry is performed and the data read speed bit is 0, and every 1/75 second when no retry is performed and the data read speed bit is 1.

As described above, according to this embodiment, by instructing the data read speed when no retry is performed from the external control device (personal computer 73) using the read speed information (data read speed pit), one record An optimum data transfer rate for real-time playback can be obtained for multiple types of time-series data recorded on a medium, and each piece of data can be played back in real-time without interruption.

In addition, it is possible to obtain the optimal data transfer rate for each real-time playback even for multiple types of recording media that record time-series data with different amounts of data required per unit time for real-time playback. This allows for uninterrupted real-time playback.

A fourth embodiment will be described below with reference to the drawings.

FIG. 9 is a block diagram of a CD-ROM drive device that is a recording medium drive device and a personal computer that is an external control device that controls the device in a fourth embodiment of the present invention.

In FIG. 9, 11.13 and 14.15 are similar to those in the first embodiment. 92 is a CD-ROM drive device which is a recording medium drive device in the fourth embodiment. C
In the D-ROM drive device 92, 122 to 129.1
210.1211 is similar to the first embodiment.

921 is a microprocessor 92 in the fourth embodiment
1.9212 is a mode changeover switch that externally switches between normal mode and high-speed mode.

The CD-ROM drive device 92 will be explained below. C
The D-ROM drive device 92 receives data read commands from the personal computer 13 similar to those in the first embodiment. The microprocessor 821 receives data read commands via the host interface circuit 1211, and also receives mode information from the mode changeover switch 9212, and controls the entire CD-ROM drive 92 based on these. When the mode information indicates the high speed mode, the CD-ROM drive device 92 operates in the same way as the CD-ROM drive device 12 of the first embodiment. If the mode information indicates normal mode, the microprocessor 921 instructs the CD-ROMI 1 to read data from the CD-ROMI 1 at the same linear velocity as CD playback in any case.
Controls the ROM drive device 92. This is based on the center frequency of the voltage controlled oscillator in the clock extraction circuit 127 and the reference clock generation circuit 12, regardless of the state of the retry bit.
This is done by controlling the frequency of the oscillator in 8 to be fixed at 4.3218 MHz.

As described above, according to this embodiment, the mode changeover switch 921 externally switches between the normal mode and the high-speed mode.
2 is provided, and the control means (microprocessor 821) is
The state of the mode selector switch indicates high-speed mode,
In addition, only when the retry function is essential, use a recording medium (CD-
By reproducing the ROMI 1) at high speed, compatibility with conventional recording medium drive devices is created, and the versatility of the recording medium drive device can be increased.

In the first embodiment, one form of controlling the recording medium drive device using the recording medium drive device control method has been described, but the recording medium drive device controlled by the recording medium drive device control method may be As long as it has a detection function, an error detection and correction function, and a retry function, it may be a device like ℃ (for example, a fixed disk drive device mentioned in the explanation of the conventional recording medium drive control method).

Furthermore, in the first embodiment, two types of voltage-controlled oscillators are used in the PLL circuit inside the clock extraction circuit 127, and in the second embodiment, three types of voltage-controlled oscillators are used by switching between them. A clock extraction circuit may be realized using the following. In this way, high-speed playback can be achieved at any playback speed. If an arbitrary playback speed can be achieved, the playback speed can be set by determining the processing capacity of the processing output means,
The playback speed can be increased or decreased according to a request from the processing output means.

In addition, in the CD-ROM drive device of the first embodiment, the playback speed when retrying is set to 2 when retrying is not performed.
However, any speed may be used as long as it is faster than the playback speed when no retry is performed.

Further, although the first to fourth embodiments have been explained using a CD-ROM as an example, the recording medium is not limited to this, and any recording medium can be used as long as it is a recording medium that can read data continuously. (for example, (DATDig
Ital Audi.

Tape) and LD-ROM (Laser
Di-sk Read Only Memory
)Such).

Further, the personal computer 1 of the first to fourth embodiments
3 controls the CD-ROM drive and drives the CD-ROM
As a form of circuit that processes data read from
CD-ROM interface circuit 133 and CD-ROM
Although the data processing circuit 134 is made independent, it is possible to send a data read command to the CD-ROM drive and perform processing such as channel determination on the data read from the CD-ROM drive. (For example, a CD-ROM data processing circuit may have a CD-R
It has a built-in circuit that operates in the same way as the OM interface circuit, and the CD-ROM data processing circuit receives instructions from the microprocessor, sends data read commands to the CD-ROM drive, and reads data sent from the CD-ROM drive. (For example, a CD-ROM data processing circuit directly receives and processes the stored data.)

Further, in the first to fourth embodiments, the CD-ROM data processing circuit and the digital-to-analog conversion circuit are provided in the personal computer, but they may also be provided in the CD-ROM drive device.

Furthermore, in the first to fourth embodiments, as a process when an instruction is given not to retry and a data error is detected, the data in which the error was detected is replaced with a hexadecimal FF and output. However, any process may be used as long as it can later identify the data in which a data error has occurred (for example, when sending data to a personal computer, an error occurs in each byte, which is the minimum unit of error detection). A 1-bit flag is provided to indicate whether or not the CD-R
(e.g., sending it to a personal computer along with the data read from the OM).

Furthermore, in the second embodiment, when specifying the data read speed, the judgment was made based on whether or not there was sufficient processing power of the microprocessor in the personal computer. When connecting control devices, the data read speed may be specified according to the capabilities of each external control device.

As described in detail of the invention, according to the recording medium drive control method of the present invention, when data read from a recording medium is time-series data and needs to be read in real time, By controlling the retry function so that it does not work, it is possible to continuously obtain data from the recording medium drive device at a constant data rate. Further, according to the recording medium drive device of the present invention, the reading means reads and outputs data from the recording medium, and performs error detection processing or error detection and correction processing on the read data, so that when an uncorrectable error is detected, error detection means that outputs a retry request command to the external control device, and an IJ from the external control device. At least the control means is characterized in that it controls the reading means to read data at a higher speed than when the retry function is instructed not to operate. , it is possible to obtain data at a high transfer rate, and its practical effects are great.

In addition, if the external control device specifies the playback speed when performing a retry to the control means, the recording medium can be played back at a transfer rate that is optimal for the processing capacity of the external device that controls the information recording medium. A media drive device can be realized.

In addition, if the playback speed when no retry is performed is specified to the control means from the outside, the recording medium drive device can play back a recording medium recording a wide variety of time-series data in real time. can be realized.

In addition, if a switch that can be changed from the outside is provided in the recording medium drive device to switch between normal mode and high-speed mode, and the control means is instructed to activate the retry function when the switch indicates high-speed mode, If the recording medium is reproduced at high speed only when the recording medium is played back, the versatility of the recording medium drive device can be increased.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a CD-ROM drive device and a personal computer that controls the device in a first embodiment of the present invention, and FIG. 2 is a block diagram of a CD-ROM drive device in the first embodiment of the present invention.
FIG. 3 is a format diagram of CD-M in the same embodiment.
A schematic diagram showing the relationship between the audio data recorded in the ROM and the audio reproduced by this audio data. FIG. 4 is a format diagram of a data read command sent from the personal computer to the CD-ROM drive in the same embodiment. , FIG. 5 shows a CD-ROM in the second embodiment of the present invention.
FIG. 6 is a block diagram of a personal computer that controls the drive device and its recording device, FIG. 6 is a format diagram of a data read command sent to the personal computer color CD-ROM drive device in the same embodiment, and FIG. 7 is a block diagram of the third embodiment of the present invention. FIG. 8 is a block diagram of a CD-ROM drive device and a personal computer that controls the device in the embodiment; FIG. 8 is a format diagram of a data read command sent from the personal computer to the CD-ROM drive device in the embodiment; FIG. 9 FIG. 2 is a block diagram of a CD-ROM drive device and a personal computer that controls the device in a fourth embodiment of the present invention. 11.71...CD-ROM112,52,72.9
2...CD-ROM drive device, 13.53°73
...Personal computer, 121,521.
721.921...Microprocessor, 127.5
27.727...Clock extraction circuit, 128.528
．． 728... Reference clock generation circuit, 129... Digital signal processing means, 1210... CD-ROM
Signal processing means, 133...CD-ROM interface circuit, 42. E32, 82... Control byte format diagram, 9212... Mode changeover switch.

Claims (1)

[Claims] (1) An error detection function that detects errors in data read from a recording medium or an error detection and correction function that detects and corrects errors in the data, and an error that cannot be corrected is detected in the read data. When reading data from the recording medium by controlling a recording medium drive device having a retry function that performs rereading, the data read from the recording medium is time-series data and is real-time data. A method for controlling a recording medium drive device, characterized in that the retry function is controlled not to operate when reading is required. (2) A reading means for reading and outputting data from a recording medium on which data is recorded; and a method for inputting the data output from the reading means and performing error detection processing or error detection and correction processing on the input data to detect uncorrectable errors. an error detection means that outputs a retry request command when an error is detected; a retry necessity command that instructs whether a retry function is necessary or not that is output from an external control device; and a retry request command that is output from the error detection means. If the retry function is required and a retry request command is not input, the reading means is controlled to read data from the recording medium faster than when the retry function is not required, and the retry function is required. If a retry request command is input, the reading means is controlled to perform a retry, and if the retry function is disabled and a retry request command is not input, the reading means is controlled at a constant transfer rate. Control means for controlling the reading means to read data from the medium, and controlling the reading means not to perform a retry when the retry function is disabled and a retry request command is input. A recording medium drive device characterized by: (3) A reading means for reading and outputting data from a recording medium on which data is recorded; and a method for inputting the data output from the reading means and performing error detection processing or error detection and correction processing on the input data to detect uncorrectable errors. an error detection means that outputs a retry request command when detected; readout speed information that instructs a first data readout speed that is output from the external control device; and a key component of the retry function that is output from the external control device;
A retry request command output from the error detection means is inputted, and if the retry function is necessary and the retry request command is not input, the first data readout command is input. The reading means is controlled to read data from the recording medium at a high speed, and when a retry function is required, and a retry request command is input, the reading means is controlled to perform a retry, and the retry function is rejected. and if a retry request command is not input, the reading means is controlled to read data from the recording medium at a predetermined transfer rate, and if the retry function is disabled and a retry request command is input. 1. A recording medium drive device comprising: control means for controlling the reading means so as not to perform a retry. (4) A reading means for reading and outputting data from a recording medium on which the data is recorded; and a method for inputting the data output from the reading means and performing error detection processing or error detection and correction processing on the input data to detect uncorrectable errors. an error detection means that outputs a retry request command when detected; readout speed information that instructs a second data readout speed that is output from the external control device; and a key component of the retry function that is output from the external control device;
inputting a retry necessity command indicating whether the retry function is rejected and a retry request command output from the error detection means; The reading means is controlled to read data from the recording medium at a high speed, and when the retry function is disabled and a retry request command is input, the reading means is controlled so as not to perform a retry, and the retry function is activated. If the retry request command is not input, the reading means is controlled to read data from the recording medium at a higher speed than the second data reading speed. A recording medium drive device comprising: control means for controlling the reading means to retry when a request command is input. (5) It has a mode changeover switch that externally switches between the normal mode and the high speed mode, and the control means controls the recording medium at high speed only when the mode changeover switch indicates the high speed mode and the retry function is required. The recording medium drive device according to claim 2, 3 or 4, wherein the recording medium drive device (6) is characterized in that the reading means is controlled so as to read data from the recording medium. 2. The data is recorded on the track at a constant angular velocity or linear velocity, and the data is read from the recording medium at high speed by increasing the reproduction angular velocity or the reproduction linear velocity.
, 3, 4 or 5. The recording medium drive device according to .