JP2008171553A - Playback device and playback method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To fade-in output sound when a recording medium with audio data recorded thereon is played back and audio data is switched. <P>SOLUTION: When at least two audio data are played back, recorded audio data is read out, read out audio data is played back by the read-out processing, played back audio data is output. Then, volume of this output audio data is adjusted, the audio data output by output processing is switched, and fade-in is started by volume adjusting processing for output of second audio data when switching from a first audio data to a second audio data to be outputted by the switching processing. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a reproducing apparatus and a reproducing method for reproducing a recording medium on which audio data and additional information are recorded, such as an optical disk apparatus for reproducing a CD (compact disc) or an MD (mini disc), and in particular, power on. The present invention relates to an audio that can be faded in at the time or when switching from another source to an audio disk.

  As is well known, in addition to the audio data of the music, additional information such as the music start / end address and title name (subcode for CD, TOC (Table of Contents) for playback-only MD), In the MD for recording, TOC and UTOC (User Table of Contents) are recorded (Patent Document 1).

  In an optical disc apparatus (CD system or MD system) for reproducing these audio discs, all of this additional information is first read from the disc, and a seek operation to the start address of the music based on this additional information and a title name panel Display and so on.

  Conventionally, in such an optical disc apparatus, when playback of an audio disc is started, the user operates an operation switch for volume adjustment (volume control) not only during reading of audio data but also during reading of this additional information. This makes it possible to adjust the volume of the output voice.

JP-A-9-153256 (paragraph 0003)

  By the way, in an optical disc apparatus, a volume controller is generally converted into an electronic volume. That is, an operation switch for adjusting the volume is built in an encoder (for example, a rotary encoder that detects the rotation direction and the rotation amount in the case of a dial type operation switch) and multiplies the read audio data by a coefficient. A circuit (level adjustment circuit) for adjusting the level (volume) by digital processing or analog processing is provided, and the microcomputer controls the level adjustment circuit according to the operation amount detection output by the encoder (level The volume of the output audio is adjusted by changing the coefficient multiplied by the audio data by the adjustment circuit.

  Some optical disc apparatuses have a fade-in function and a fade-out function. In an optical disk apparatus in which the volume controller is turned into an electronic volume, generally, the microcomputer gradually increases the coefficient of the level adjustment circuit from zero, so that the output sound is faded in. On the other hand, this coefficient is reduced to zero. By gradually decreasing the value toward, the output sound is faded out.

  By the way, in a conventional optical disc apparatus having a fade-in function, when the fade-in is performed when the power is turned on, the entire (or most) period of the fade-in is over while reading the additional information. When the reading of the additional information is completed and the reading of the audio data is started, the sound may be output in the same state as when the fade-in is not applied (or hardly applied).

  Alternatively, in a conventional audio system in which an optical disc apparatus and other sources (sound sources) (for example, a radio receiver or a tape recorder) are integrated, when the source is switched or the power is turned on, the radio or the When switching to tape or when the power is turned on with the source set to radio or tape, the sound is output immediately, so fade-in takes place. However, when switching to an audio disk or when the source is set to an audio disk When turned on, the audio will still sound in the same state as if it was not faded in at all (or almost not) because all (or most) of the fade-in period passed while reading the additional information. Sometimes it was output.

Accordingly, an object of the present invention, like the optical disk apparatus for reproducing the audio disc, the reproducing apparatus for reproducing a recording medium which records audio data, even such as when switching to the audio disc from other sources, is output It is intended to provide a sound that can be faded in.

The present invention provides a playback apparatus for playing back at least two audio data.
Reading means for reading audio data recorded in the recording means;
Reproducing means for reproducing the audio data read by the reading means;
Output means for outputting the audio data reproduced by the reproducing means;
Volume control means for adjusting the volume of audio data output by the output means;
Switching means for switching audio data output by the output means;
And control means for causing the volume adjusting means to start fade-in with respect to the output of the second audio data when the output audio data is switched from the first audio data to the second audio data by the switching means. Is.

In the present invention, the audio data is recorded in the recording means together with additional information of the audio data,
When the output audio data is switched to the second audio data, the control means causes the volume adjusting means to start fade-in after reading of the additional information of the second audio data is completed. .

According to the present invention, so that the output is faded in to the voice are consuming.

  FIG. 1 is a block diagram showing an outline of an existing reproduction-only MD system to which the present invention is applied. The mini disk 2 in the cartridge 1 mounted on the MD system is rotated by the spindle motor 3, and a signal read from the mini disk 2 by the optical pickup 4 is sent to the RF amplifier 5.

  The RF amplifier 5 outputs a waveform-shaped servo error signal (focus servo error signal and tracking servo error signal), address signal, and RF signal based on the signal from the optical pickup 4.

  Of these, the servo error signal is sent to the servo control circuit 6. The servo control circuit 6 controls the feed mechanism 18 of the optical pickup 4 and the spindle motor 3 based on the servo error signal and the rotation speed information obtained based on the FG signal output from the spindle motor 3.

  On the other hand, the address signal is sent to the address decoder 7. The address decoder 7 decodes this address signal, and generates address data indicating the physical address of the recording position where the laser beam spot is currently irradiated on the mini disk 2 by the optical pickup 4.

  On the other hand, the RF signal is sent to the EFM and ACIRC decoder 8. The address data generated by the address decoder 7 is also sent to the EFM and ACIRC decoder 8. The EFM and ACIRC decoder 8 performs EFM demodulation processing and ACIRC error correction processing on the RF signal.

  The audio data of the signals that have been processed by the EFM and ACIRC decoder 8 is temporarily stored in the memory (1M bit DRAM as an example) 10 via the shock resistant memory controller 9 to prevent sound skipping.

  The audio data read from the memory 10 is sent to the audio compression ATRAC decoder 11 via the shock resistant memory controller 9. The audio compression ATRAC decoder 11 decodes (decompresses) audio data that has been compressed by the ATRAC method. The decoded audio data is analog-converted by the D / A converter 12, amplified by the power amplifier 13, and output from the speaker 14 as sound.

  On the other hand, the TOC of the signals that have been processed by the EFM and ACIRC decoder 8 is sent to the system controller 15. The system controller 15 controls each part of the system such as the servo control circuit 6, the EFM and the ACIRC decoder 8, the memory controller 9, and the display unit (liquid crystal panel or the like) 17 in accordance with the operation of the operation key 16. The TOC sent from the ACIRC decoder 8 is stored in a buffer memory (not shown), and based on this TOC, the spindle motor 3 and the like are connected via the servo control circuit 6 during a seek operation to the start address of the music. The feed mechanism 18 is controlled.

  Next, FIG. 2 is a block diagram showing an example of a part in the MD system of FIG. The system controller 15 includes a main CPU 151 and various sub CPUs (a CPU for mechanism control, a CPU for display control, etc.), and the mechanism control CPU 152 among these sub CPUs sets the start address of the music. The spindle motor 3 and the feed mechanism 18 (FIG. 1) are controlled via the servo control circuit 6 (FIG. 1) during the seek operation. Therefore, the TOC is sent from the EFM and ACIRC decoder 8 of FIG.

  In this MD system, the volume controller is an electronic volume. That is, in the operation key 16, a dial type operation switch for volume adjustment is built in the rotary encoder 161, and the rotation amount and rotation direction detection output of the rotary encoder 161 are sent to the main CPU 151. Further, a level adjustment circuit 21 that adjusts the level (volume) by multiplying audio data that has undergone EFM demodulation processing and error correction processing by a coefficient is provided as a digital circuit in the D / A converter 12 of FIG. 1, for example. Alternatively, as another example, an analog circuit is provided in the power amplifier 13 of FIG. The main CPU 151 controls the level adjustment circuit 21 based on the detection output of the rotary encoder 161 (changes a coefficient to be multiplied with the audio data by the level adjustment circuit 21), so that the audio output from the speaker 14 in FIG. Adjust the volume.

  Then, the mechanism control CPU 152 generates a signal indicating whether the TOC is being supplied or all the TOC has been supplied, and sends this signal (S1 in the figure) to the main CPU 151. Yes.

  Next, the volume adjustment operation in this MD system will be described. When the user operates the rotary encoder 161 in order to adjust the volume after the reproduction of the mini-disc 2 is started by operating the operation switch for reproduction in the operation key 16 in FIG. A detection output is sent to the main CPU 151.

  At this time, if the optical pickup 4 is still reading the TOC, since the TOC is being supplied from the EFM and the ACIRC decoder 8 to the mechanism control CPU 152, the signal S1 indicating that is sent from the mechanism control CPU 152 to the main control CPU 152. It is sent to the CPU 151.

  On the other hand, if the optical pickup 4 has finished reading the TOC and has started reading the audio data at this time, the supply of the TOC from the EFM and the ACIRC decoder 8 to the mechanism control CPU 152 has been completed. A signal S1 indicating that is sent from the mechanism control CPU 152 to the main CPU 151.

  The main CPU 151 determines the content of the signal S1. If the signal S1 indicates that the TOC is being supplied, the level adjustment is performed regardless of the detection output of the rotary encoder 161. The coefficient of the circuit 21 is not changed. Therefore, the volume of the sound output from the speaker 14 when the audio data is read by the optical pickup 4 is not increased or decreased by the operation of the operation switch 161 at this time.

  On the other hand, if the signal S1 indicates that the supply of TOC has been completed, the main CPU 151 changes the coefficient of the level adjustment circuit 21 in accordance with the detection output of the rotary encoder 161. Therefore, the volume of the sound output from the speaker 14 based on the audio data currently read by the optical pickup 4 is increased or decreased by the operation of the operation switch 161 at this time.

  Thus, according to this MD system, even if the user operates the rotary encoder 161, the volume adjustment is suppressed during reading of the TOC. This prevents a situation in which the volume is erroneously adjusted during the reading of the TOC, so that unexpected loud sound does not occur when sound starts to be output from the speaker 14 thereafter.

  Next, FIG. 3 is a block diagram showing another example of a part related to the present invention in the MD system of FIG. 1. In FIG. 3, the same parts as those in FIG. Omitted.

  In this example, it is assumed that the MD system of FIG. 1 and a radio receiver and a tape recorder (not shown) are integrated to form an audio system. The operation key 16 is provided with an operation switch 162 for fading in when the source is switched between the radio tape, the mini-disc 2 or when the power is turned on, and a signal indicating the on / off state of the operation switch 162 is provided. Is sent to the main CPU 151. When the operation switch 162 is turned on, the main CPU 151 controls the level adjustment circuit 21 when the source is switched or the power is turned on (the coefficient multiplied by the audio data in the level adjustment circuit 21 is gradually increased from zero). Thus, the sound output from the speaker 14 in FIG. 1 is faded in.

  Next, the fade-in operation in this audio system will be described. When the user switches the source to radio or tape with the operation switch 162 turned on, or when the user turns on the power with the source set to radio or tape, the main CPU 151 immediately The level multiplication circuit 21 gradually increases the coefficient multiplied by the audio data from zero.

  On the other hand, when the user switches the source to the mini disk 2 with the operation switch 162 turned on, or when the user turns on the power with the source set to the mini disk 2, the main CPU 151 The content of the signal S1 is determined. If the signal S1 indicates that the TOC is being supplied, the coefficient of the level adjustment circuit 21 is maintained to be zero, and then the signal S1 is completely supplied with the TOC. This coefficient is gradually increased from zero.

  As a result, as shown in FIG. 4B, when the source is switched to the radio or the tape, or when the power is turned on with the source set to the radio or the tape, the fade-in is started immediately. On the other hand, when the source is switched to the mini disk 2 or when the power is turned on with the source set to the mini disk 2, the fade-in start timing is changed at the end of reading the TOC. Therefore, when the source is switched to the mini disc 2 or when the power is turned on with the source set to the mini disc 2, the reading of the TOC is finished and the reading of the audio data is started. Fade-in is applied to the output audio. (On the other hand, FIG. 4A shows a conventional operation in which the fade-in is always started immediately when the source is switched or the power is turned on, as compared with FIG. 4B. In this fade-in operation, When the source is switched, or when the power is turned on with the source set to the mini disc 2, the entire fade-in period (or most) is over while reading the TOC. (After reading, audio output may start in the same state as if no fade-in was applied (or little).)

  In the example of FIG. 2, the adjustment of the volume during the reading of the TOC is suppressed without distinguishing whether the rotation direction of the rotary encoder 161 is the direction of increasing or decreasing the volume. However, it is only when the rotation direction of the rotary encoder 161 is the direction that increases the volume that the loud sound is unexpectedly generated from the speaker 14 by adjusting the volume by mistake during the reading of the TOC. For example, the adjustment of the volume during reading of the TOC is suppressed only when the rotation direction of the rotary encoder 161 is a direction for increasing the volume, and when the rotation direction is a direction for decreasing the volume, the volume during the reading of the TOC. This adjustment may not be suppressed.

  In the example of FIG. 2, the adjustment of the volume during reading of the TOC is suppressed. However, in an MD system having a bus control / treble control function and a balance control function, the level adjustment circuit 21 is generally used for these functions. Therefore, in such an MD system, not only the volume adjustment but also the bus control / treble control and the balance control may be suppressed during the reading of the TOC.

  In the example of FIG. 3, the MD system is described as being integrated with the radio receiver and the tape recorder to form an audio system. However, the MD system includes the radio receiver and the tape recorder. Of course, it may be integrated with either one or other appropriate sources (sound sources). Alternatively, the audio system may be formed only by the MD system alone, and in this case, the fade-in start timing may be changed at the end of reading the TOC only when the power is turned on.

  In the examples of FIGS. 2 and 3, one of the suppression of volume adjustment during reading of the TOC and the change of the fade-in start timing to the end of reading of the TOC are performed. Of course, both of these may be performed in (or an audio system in which the MD system and other sources are integrated).

  In the above example, the mechanism control CPU sends a signal indicating whether the TOC is being supplied or the supply of the TOC has been completed to the main CPU. However, the present invention is not limited to this, and such a signal may be sent from the other appropriate sub CPU to which the TOC is sent from the EFM and ACIRC decoder 8 to the main CPU. Further, for example, when the TOC is also sent from the EFM and ACIRC decoder 8 to the main CPU itself, depending on whether the TOC is being supplied to the main CPU itself or all the supply of the TOC has ended. Whether to change the coefficient of the level adjustment circuit 21 may be determined.

  In the above example, the present invention is applied to the reproduction-only MD system. However, the recording MD system, the CD system, and other appropriate reproduction mediums that record additional information other than audio data are reproduced. The present invention may be applied to an audio device. Further, the present invention is not limited to the above examples, and it is needless to say that various other configurations can be taken without departing from the gist of the present invention.

It is a block diagram which shows an example of MD system to which this invention is applied. It is a block diagram which shows the example of a part of MD system of FIG. 1 in detail. It is a block diagram which shows in detail an example of the part relevant to this invention among MD system of FIG. It is a figure which shows an example of fade-in operation | movement.

Explanation of symbols

  1 cartridge, 2 mini disk, 3 spindle motor, 4 optical pickup, 5 RF amplifier, 6 servo control circuit, 7 address decoder, 8 EFM and ACIRC decoder, 9 shock resistant memory controller, 10 memory, 11 audio compression ATRAC decoder, 12 D / A converter, 13 power amplifier, 14 speaker, 15 system controller, 16 operation key, 17 display unit, 18 feed mechanism, 21 level adjustment circuit, 151 main CPU, 152 mechanism control CPU, 161 rotary encoder, 162 Operation switch for fade-in indication

Claims (3)

In a playback device for playing back at least two audio data,
Reading means for reading audio data recorded in the recording means;
Reproducing means for reproducing the audio data read by the reading means;
Output means for outputting the audio data reproduced by the reproducing means;
Volume control means for adjusting the volume of audio data output by the output means;
Switching means for switching audio data output by the output means;
And control means for causing the volume adjusting means to start fade-in with respect to the output of the second audio data when the output audio data is switched from the first audio data to the second audio data by the switching means.
A reproducing apparatus characterized by that. Audio data is recorded in the recording means together with additional information of the audio data,
When the output audio data is switched to the second audio data, the control means causes the volume control means to start fade-in after reading of the additional information of the second audio data is completed.
The playback apparatus according to claim 1. In a playback method for playing back at least two audio data,
Read processing for reading the recorded audio data;
A reproduction process for reproducing the audio data read by the read process;
An output process for outputting the audio data reproduced by the reproduction process;
A volume adjustment process for adjusting the volume of the audio data output by the output process;
A switching process for switching the audio data output by the output process;
A control process for starting fade-in in the volume adjustment process for the output of the second audio data when the output audio data is switched from the first audio data to the second audio data by the switching process.
A reproduction method characterized by the above.

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