JP2000040299A - Sound recording device and sound recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a part of a music, which has been an object for copying prohibition, from being unintentionally recorded by delaying an audio signal by a prescribed time and preventing the recording of the delayed audio signal on a recording medium when the copying prohibition bit accompanying the audio signal is detected. SOLUTION: An input circuit 20 extracts the audio signal (a) corresponding to each piece of music from inputted signals and supplies this audio signal to a delay circuit 21. This delay circuit 21 supplies the delayed audio signal (b) obtained by delaying the audio signal (a) by a prescribed time to a mute circuit 23. This mute circuit 23 starts mute operation when a mute control signal (c) is a mute-on demand signal. The circuit releases the mute operation when the control signal described above is a mute-off demand signal. At this time, if the delay time of the delay circuit 21 is set longer than the time necessary for the detection and decision of the copying bit, such a trouble, that the sound recording of the music having been an object for copying prohibition is unintentionally done before the end of the detection and decision of the copying bit can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus and a recording method for recording an audio signal.

[0002]

2. Description of the Related Art CD (Compact Disc), MD (Mini Dis
c) In music software created by DAT (Digital Audio Tape) or the like, in addition to audio signals corresponding to each song, a track number signal indicating a song number, and a song bar obtained by subdividing one song are indicated. An index number signal and the like are recorded as subcode information.

Further, a copy prohibition bit indicating that digital copying of the audio signal is prohibited may be recorded in the subcode.

Accordingly, in a recording device such as a CD-R (Compact Disc Recordable) for dubbing a song from music software as described above, when a copy prohibition bit in a subcode is detected during digital recording, the recording is immediately performed. It is possible to cancel. FIG. 1 shows an example of a configuration for executing such a digital copy.

In FIG. 1, a CD player 1 as a source plays a music software CD, reads an audio signal corresponding to each music and a subcode signal, and reads the subcode signal as a CD-R (Compact Disc Recordable) as a recording device.
e) Supply to recorder 2. The CD-R recorder 2 modulates the audio signal and the subcode signal, converts the modulated signal into a light beam, and irradiates the recording disk as a recording medium to perform recording. That is, the same audio signal and subcode signal as those of the music software CD on the source side are recorded on the recording disk on which the recording is performed by the CD-R recorder 2.

When the CD-R recorder detects that a sub-code includes a copy prohibition bit, the CD-R recorder stops recording. At this time, since the copy prohibition bit is included in the subcode supplied together with the audio signal, the audio information is recorded on the CD-R for the time required from the detection of the copy prohibition bit to the stop of recording. Will be.

[0007] Therefore, only a part of a music piece may be recorded on a disc recorded by such a recording method, and an unpleasant piece of music remains on the disc during reproduction.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem, and provides a recording apparatus and a recording method capable of preventing a part of a tune whose copying is prohibited from being recorded. The purpose is to provide.

[0009]

A recording device according to the present invention comprises: a delay unit for delaying an audio signal by a predetermined time; a recording unit for recording a delayed audio signal delayed by the delay unit on a recording medium; A detection unit for detecting a copy prohibition bit attached to the signal; and a control unit for preventing the recording unit from recording the delayed audio signal on the recording medium when the copy prohibition bit is detected.

[0010]

An audio signal obtained by delaying the audio signal supplied from the source side by a predetermined time is recorded, and a copy prohibition bit in the subcode information accompanying the audio signal is detected, and the copy prohibition bit is detected. And prevent recording of delayed audio signals.

[0011]

FIG. 2 shows the configuration of a recording apparatus according to the present invention. In the figure, a digital signal supplied from a source side is supplied to an input circuit 20. The input circuit 20 extracts an audio signal (a) corresponding to each music from the supplied digital signal, and supplies the extracted audio signal (a) to the delay circuit 21. Further, the input circuit 20 extracts a subcode signal from the supplied digital signal and
To supply. The delay circuit 21 delays the supplied audio signal (a) by the time T1, and supplies the delayed audio signal (a) to the mute circuit 23 as a delayed audio signal (b). When the mute control signal (c) supplied via the CPU bus 22 is a mute-on request signal, the mute circuit 23 starts the mute operation in response to the signal. As a result, the mute circuit 23 mutes the delayed audio signal (b) to convert it into the same silence signal as in the silence state, and uses this as a mute output signal (d).
4 If the mute control signal (c) is a mute-off signal, the mute circuit 23 cancels the mute operation in response to the mute control signal (c) and outputs the delayed audio signal (b) as it is to the encoder 24 as a mute output signal (d). Supply relay.

The encoder 24 uses the mute output signal (d) as a main code signal,
A CD-formatted signal is obtained by combining with the sub-code signal (e) supplied from 2 and a modulated signal (f) obtained by modulating this signal is supplied to the recording unit 25. The recording unit 25 includes a recording disk 2 as a recording medium for recording.
5a, a spindle motor 25b for rotatingly driving the recording disk 25a, and an optical head 2 for converting the modulation signal (f) into a light beam and irradiating the light beam to the recording disk 25a.
5c. By the light beam emitted from the optical head 25c, the modulation signal (f) is transmitted to the recording disk 2
5a. The delay counter 26 is connected to the CPU bus 2
2 starts a count operation in response to a counter start command signal supplied from
Send it to the bus 22. The operation unit 27 sends an operation request signal to the CPU bus 22 according to an operation instruction from the user. For example, the operation unit 27 sends a recording operation request signal to the CPU bus 22 in response to a recording operation instruction from the user. The CPU (Central Processing Unit) 29
According to the operation procedure stored in the M (Read Only Memory) 28, various operation controls of the recording device having the above-described configuration are executed via the CPU bus 22.

Next, the recording operation of the recording apparatus of the present invention will be described with reference to FIGS. First, the operation unit 27 sends a recording operation request signal to the CPU bus 22 in response to a recording instruction from the user. The CPU 29
In response to the recording operation request signal, a control signal for causing the recording unit 25 to enter the recording pause state is sent to the CPU bus 22. Next, the CPU 29 sends the input
The sub-code signal supplied via the bus 22 is read, thereby determining whether or not the audio signal (a) corresponding to the first music piece for recording has been supplied from the source side. At this time, as shown in FIG.
Is determined to be supplied from the source side, the CPU 29
Shifts its operation control to an initial recording subroutine as shown in FIG.

When the execution of the initial recording subroutine is started, the CPU 29 first supplies a mute-on request signal as a mute control signal (c) to the mute circuit 23 via the CPU bus 22 (step S1). The mute circuit 23 starts a mute operation in response to the mute-on request signal, and supplies a signal corresponding to a silent state to the encoder 24 as a mute output signal (d). Next, the CPU 29 sets the index number signal to “0”.
Is generated and sent to the encoder 24 via the CPU bus 22 (step S).
2). Next, the CPU 29 sends a recording start command signal to the CPU.
The data is sent to the recording unit 25 via the bus 22 (step S3). Thereby, the recording unit 25 releases the recording pause state and starts the recording operation. Next, CPU2
9 sends a counter start command signal to the delay counter 26 via the CPU bus 22 (step S4). Thereby, the delay counter 26 starts the counting operation,
The count value T at this time is sent to the CPU bus 22. Next, the CPU 29 sets the count value T until the count value T of the delay counter 26 exceeds the value corresponding to the time T2.
And the time T2 are compared (step S5). still,
The time T2 takes a value slightly smaller than the delay time T1 of the delay circuit 21.

As described above, during execution of step S5, the mute output signal (d) corresponding to the silent state and the subcode signal (e) of the index number signal "0".
Are supplied to the encoder 24 respectively. Therefore, in this case,
A modulated signal (f) obtained by modulating a signal corresponding to the silence state and a CD-formatted signal with a subcode signal of the index number signal “0” is recorded on the recording disk 25a. If it is determined in step S5 that the count value T of the delay counter 26 has exceeded the time T2, the CPU 29 generates a subcode signal (e) with the index number signal being "1",
The data is sent to the encoder 24 via the PU bus 22 (step S6). Next, the CPU 29 supplies a mute off request signal as a mute control signal (c) to the mute circuit 23 via the CPU bus 22 (Step S7).
The mute circuit 23 stops the mute operation in response to the mute off request signal.

After the above operation is completed, the delayed audio signal (b) corresponding to the first music is supplied to the mute circuit 23. Therefore, at this time, the delayed audio signal corresponding to the first music is supplied as it is to the encoder 24 as a mute output signal (d), and the subcode signal (e) of the index number signal “1” is also supplied to the encoder 2.
4 is supplied. As a result, a modulated signal (f) obtained by modulating a CD-formatted signal with the delayed audio signal corresponding to the first music and the subcode signal of the index number signal “0” is recorded on the recording disk 25a. You.

In the above embodiment, the time T2 is measured by using the delay counter 26. However, the time T2 is measured by the CPU 29 counting the number of frames in the supplied subcode signal. You can go. After the end of step S7, the CPU 29 exits the initial recording subroutine as described above and returns to the normal recording operation execution routine.

In the normal recording operation execution routine, the unmuted delayed audio signal (b)
Is used as the mute output signal (d)
4 and the CPU 29 directly supplies the subcode signal supplied from the source side to the encoder 24 as a subcode signal (e). By this normal recording operation, the audio signal and the subcode signal recorded on the music software CD on the source side are recorded on the recording disk 25a as they are.

As described above, in the recording apparatus according to the present invention, before the execution of the ordinary recording operation, the initial recording subroutine is executed as described above to generate the silent state signal and the index number signal "0" as shown in FIG. Sub-code signals are generated, and these are recorded before the audio signal of the first music supplied from the source side. Therefore, according to the present invention, even when an audio signal is supplied from the source side at the same time as the start of recording, the inter-song portion (silent state) of the index number signal “0” is automatically recorded before the audio signal. You can do it.

Further, in the recording apparatus according to the present invention, as shown in FIG. 2, since the delay circuit 21 is provided in the recording signal line, the recording signal is transferred to the recording disk at a timing delayed by a predetermined time from the signal supply timing on the source side. Is recorded. Therefore, if the user notices a mistaken recording after starting the recording, and stops recording within the delay time of the delay circuit 21, even if the signal corresponding to the music is supplied from the source side, the signal is not recorded. Is not recorded on the recording disk. Therefore, mistaken recording can be prevented.

A copy bit signal for copyright protection is recorded in the CD and CD-R subcode signals in addition to the index number signal as described above. In the dubbing operation, the recording device first detects a copy bit signal from the subcode signal supplied from the source side, and determines whether or not the copy bit signal indicates copy prohibition. At this time, if it is determined that the copy prohibition is indicated, the recording device must not record the music subject to the copy prohibition. here,
If the delay time of the delay circuit 21 shown in FIG. 2 is set longer than the time required to detect and determine the copy bit,
Before the detection and determination of the copy bit is completed, it is possible to prevent a problem that the music which is the copy prohibition target is recorded.

[0022]

As described above, the recording apparatus according to the present invention records an audio signal obtained by delaying the audio signal supplied from the source by a predetermined time, and copies the sub-code information accompanying the audio signal. A prohibition bit is detected, and when the copy prohibition bit is detected, recording of a delayed audio signal is prevented. With this configuration, it is possible to prevent recording of a part of the music for which copying is prohibited.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of dubbing recording.

FIG. 2 is a diagram showing a configuration of a recording device according to the present invention.

FIG. 3 is a diagram illustrating an example of a recording operation by the recording device of the present invention.

FIG. 4 is a flowchart of an initial recording subroutine by the recording device of the present invention.

[Explanation of Signs of Main Parts]

 21 delay circuit 23 mute circuit 26 delay counter

Claims (3)

[Claims] 1. A recording device for recording an audio signal, comprising: delay means for delaying the audio signal by a predetermined time; recording means for recording the delayed audio signal delayed by the delay means on a recording medium; Detecting means for detecting a copy prohibition bit associated with the audio signal; and control means for preventing the recording means from recording the delayed audio signal on the recording medium when the copy prohibition bit is detected. A sound recording device, characterized in that: 2. The recording apparatus according to claim 1, wherein the predetermined time is longer than a time required for the detection means to detect a copy prohibition bit. 3. A recording method for recording an audio signal, comprising: a delaying step of delaying the audio signal by a predetermined time; a detecting step of detecting a copy prohibition bit associated with the audio signal; A recording method, comprising: a recording step of recording an audio signal on a recording medium; and a control step of preventing the delayed audio signal from being recorded on the recording medium when the copy inhibition bit is detected.