JP3528673B2 - Audio signal recording device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio signal recording device, and more particularly to an audio signal recording device for recording digital audio data containing emphasis information.

[0002]

2. Description of the Related Art Generally, CD-R (Compact Disc-Recor)
dable) recorder, CD-RW (Compact Disc-ReWrita)
ble) In digital recording by a recording medium such as a recorder, emphasis information is recorded on a disc as a subcode together with audio data. For example, in the CD (Compact Disc) format,
Main information that represents an audio signal and sub-code information for various controls are recorded together, and this sub-code information indicates whether or not there is so-called "emphasis" that increases the signal amplitude in a specific frequency band. It is included. Further, since the presence / absence information of emphasis can be set for each song recorded in the disc, the presence / absence of emphasis may change when the song changes.

CD player, DAT (Digital Audio Ta)
pe) CD-R using a player as a digital source device
When digitally recording digital audio data from a source device using a recorder, a CD-RW recorder or the like as a digital recording device, normally, the recording start operation is performed on the recording device side and then the reproduction start operation is performed on the source device side. . In this case, on the source device side, that is, on the reproducing device side, data that is invalid as a logical format continues to be output as a digital signal, although the physical format is the same as during actual reproduction until the reproduction is started. Therefore, on the recording device side, no signal information (data of "zero" as an audio signal) is recorded on the disc from the beginning of recording to the start of reproduction on the source device side. , Sub-code information must be created and added to this non-signal information. Therefore,
Emphasis information must also be set and recorded with or without emphasis.

In the above case, the subcode information recorded together with the non-signal information at the start of recording on the recording device side includes emphasis information in which presence or absence of emphasis is set. Then, when the reproduction of the digital audio data is started on the source device side after the recording is started, the output of the data accompanied by the effective logical format in the reproduction signal is started, so that the recording device side has predetermined emphasis information. The audio signal is input and recorded on the disc. However, this emphasis information may be different from the emphasis information recorded together with the non-signal information at the start of recording. If different, the emphasis data should be recorded by switching the reproduction data from the recording point of the source device. become. Therefore, when the disc recorded in this way is reproduced by the reproducing device, the reproducing device switches the circuit or the like according to the difference in the emphasis information, so that noise or sound interruption may occur during the reproduction. There is.

In this way, when the source device side is started from the stopped state, the recording device side cannot obtain the emphasis information of the source to be recorded from the source device side at the start of recording, so that the recording device side is Recording must be started while the emphasis information of the non-signal information remains undefined with respect to the emphasis information of the source. If the emphasis information of the no-signal information when the recording is started on the recording medium such as a disc at the start of the recording is different from the emphasis information of the source audio data recorded on the recording medium after the reproduction of the source device, these no-signal information Considering information and audio data as one track (song), a recording medium in which emphasis information changes in the middle of the track (song) is created. Therefore, when reproducing the recording medium in which the emphasis information is recorded differently as described above, a trouble such as noise or sound break may occur due to emphasis switching in the middle of the track (song).

[0006]

SUMMARY OF THE INVENTION In view of such inconvenience, the present invention has a relatively simple structure and records in a recording medium such as a disc so that the emphasis information is constant in the same track. Therefore, it is an object of the present invention to provide an audio signal recording device which does not cause a trouble such as noise and sound interruption due to switching of emphasis during the reproduction of the recording medium in the middle of a track (song).

[0007]

According to the main feature of the present invention (hereinafter, for the sake of understanding, the reference numerals of the corresponding embodiments are added in parentheses), the recording start instruction (t0) is followed by the source. The signal can be received from (1), and the audio signal (AF) reproduced by the source (1) in response to the reproduction start command (t1) after the recording start command (t0).
Of the audio signal (AF) and control data (C
R) and audio data (AD), a receiving means (21), an input start detecting means (23, 22) for detecting an input start of the audio signal (AF), and the above-mentioned input start detection based on the above. An emphasis acquisition means (22) for acquiring emphasis information from the control data (CR) from the reception means (21) and the recording start command (t).
Memory means (24) for delaying the non-signal information and the audio data from the receiving means for the time (d) from the recording start command (t0) to the acquisition of the emphasis information at least. An emphasis setting means (22, 25) for setting the acquired emphasis information as emphasis information for the delayed no-signal information and audio data (DD), and the delayed no-signal information and audio data (DD), In addition, recording means (22, 2) for recording control data (EC) including the set emphasis information on a recording medium.
6, 27) is provided.

The input start means in the audio signal recording apparatus of the present invention is the audio signal (AF).
By detecting the rise of sound from the audio data (AD) included in the control data (CR).
It can be configured to detect the start of input of audio data by detecting the continuity of the sub-code value (for example, the frame value of the time information).

[0009]

[0010]

[Operation] In the audio signal recording apparatus according to the present invention, the receiving means (21), the input start detecting means (23, 22), the emphasis acquiring means (22), the memory means (24), the emphasis setting means (22, 22). 25) and recording means (22, 2)
6, 27). In this apparatus, first, in starting a digital recording operation for recording an audio signal (AF) including audio data (AD) and control data (CR) including emphasis information on a recording medium (28) such as an optical disk, first, When the recording start command button is pressed to issue the recording start command (t0), the receiving means (21) can thereafter receive a signal from the source (1). Next, when the reproduction start command button is pressed after the recording start command (t0) to issue the reproduction start command (t1), the source (1) is generated in response to the reproduction start command.
Reproduces an audio signal (AF), and receiving means (21)
Receives this audio signal (AF) and separates it into control data (CR) and audio data (AD). Further, the input start detecting means (23, 22) monitor, for example, the audio level (sound level) represented by the audio data (AD) or the continuity of subcode values in the control data (CR). The input start of the audio signal (AF) is detected by using an audio signal monitoring method such as that, and the emphasis acquisition means (22) detects the emphasis from the control data (CR) of the input audio signal (AF) at this detection timing. Get information.

The memory means (24) stores a recording start command (t
0) starts memory operation and starts recording (t0)
Function of delaying the audio data (AD) from the receiving means (21) for at least the time (d) until the emphasis information is acquired from the recording medium (28). However, for this purpose, a delay means such as a first-in first-out (FIFO) memory is used. Then, when the emphasis information is acquired by the emphasis acquisition means (22),
The emphasis setting means (22, 25) sets the acquired emphasis information as the emphasis information of the no-signal information and the audio data (DD) delayed by the memory means (24), and the recording means (22, 26, 2).
7) records the control data (EC) including the set emphasis information on the recording medium (28) together with the delayed signalless information and the audio data (DD).

Further, the input start detecting means of the present invention detects whether the sound rises from the audio data (AD),
Alternatively, the start of input of audio data is surely detected by a relatively simple method of detecting continuity of subcode values in control data (CR).

That is, according to the present invention, when the audio signal (AF) including the audio data (AD) and the control data (CR) is input by sequentially instructing the start of recording and the start of reproduction, the level of the audio data is set. The audio signal (AF) is monitored by, for example, monitoring the continuity of subcode values, and the audio data (AD) is delayed by the delay memory means (24). The audio signal (A
When the input start of F) is confirmed, emphasis information is read from the input audio signal (AF) at this timing. Then, when the delay time (d) set in the delay memory means (24) elapses, the read emphasis information is recorded in the recording medium (28) together with the delayed no-signal information and the audio data (DD). .

Further, to confirm the start of the audio signal input, as described above, the rising of the sound is detected from the audio data (AD), or the continuity of the subcode value such as the frame value of the time information is detected. Methods are adopted, and by these methods, the input start of audio data can be detected relatively easily and reliably.

Therefore, according to the present invention, when the reproduction start command is issued after the recording start command to record the audio data to the recording medium such as the disk, the emphasis data of the audio data is acquired before the audio data is recorded. So, within the same track (song),
That is, it is possible to record so that the emphasis information becomes constant with respect to no-signal information and audio data.
When reproducing this recording medium, there is no possibility of causing troubles such as noise and sound interruption due to switching of emphasis in the middle of a track (song).

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail below with reference to the drawings. The following embodiments are merely examples, and various modifications can be made without departing from the spirit of the present invention.

[System Configuration] FIG. 1 is a block diagram showing the system configuration of an audio signal recording apparatus according to an embodiment of the present invention. The digital source device 1 is a digital audio device that performs signal processing in a format in which emphasis information is included in individual control data such as a subcode, for example, a CD player, a CD-R player,
DAT player or DVD (Digital Video Dis
c) An audio player (for 44.1, 88.2kHz sampling, etc.), etc.

The digital source device 1 transmits a digital audio interface (DAI) signal AF to the CD recorder 2 by pressing a reproduction start command button (not shown). The CD recorder 2 used as a digital recording device has a DAI signal A from the source device 1 after a recording start command button (not shown) is pressed.
F for Digital Audio Interface (DAI)
It can be received by the receiver unit 21.

The received DAI signal AF is the digital audio data AD and the "channel status",
Control data CR (hereinafter referred to as “user data”)
This is called "channel status / user data". ), And each data A in the DAI receiver unit 21
Separated into D and CR. The channel status / user data CR separated by the DAI receiver 21 is the CPU
(Central Processing Unit) 22 and while
The digital audio data AD is DSP (Digital Si
gnal Processor) 23.

Here, in the channel status / user data CR, in addition to the emphasis information, there is other subcode signal information that continuously changes with the reproduction of time information of the reproduction portion. For example, in this time information, the time from the beginning of the reproduction song is minute, second, frame (1 second of 1 second).
/ 75) and the like, and absolute time information that also represents the time from the beginning of the first song, and such time information changes continuously with the start of reproduction.

Therefore, according to the present invention, one method for detecting the reproduction start of the source device 1 which is the reproducing device on the CD recorder 2 side is to detect the audio level (sound level) input from the source device 1. By doing so, a method of detecting the start of reproduction can be adopted, but as another method, the channel status / user data CR
It is also possible to adopt a method of detecting the start of reproduction by analyzing the continuity of the subcode signal information included in the user data of. In the following, the description will be mainly focused on the former method of detecting reproduction start by level detection, but the latter method of detecting reproduction start by subcode continuity detection will be supplemented each time.

The CPU 22 generates a DSP control signal PC for setting audio level detection conditions and the like and a memory control signal MC for setting delay time and the like, and also DA
In accordance with the emphasis information in the channel status / user data CR from the I receiver 21 and the audio level detection signal AL from the DSP 23, a recording subcode control signal EC and servo control signal SC including emphasis control information are generated, These signals PC, MC, E
DSP 23 and FIFO memory 2 by C and SC, respectively
4. Control the CD encoder unit 25 and the servo drive unit 26.

In the DSP 23, the DSP from the CPU 22
Digital audio data AD according to control signal PC
Is subjected to digital signal processing, the audio signal level represented by the audio data AD is monitored, and this signal level is set to a predetermined audio level threshold L.
When s is exceeded, the above audio level detection signal AL is generated and output to the CPU 22.

The audio data PD, which has been digitally processed by the DSP 23, is input to the FIFO memory 24, and its reading / reading is controlled according to the memory control signal MC from the CPU 22. The FIFO memory 24 is delayed by the memory control signal MC, the input audio data PD is read as delayed audio data DD with a predetermined delay time d, and the audio data DD read from the memory 23 is It is input to the CD encoder unit 25.

In the CD encoder section 25, based on the delayed audio data DD and the emphasis control information in the recording subcode control signal EC from the CPU 22,
An EFM (Eight to Fourteen Modulation) digital signal EF in which the corresponding emphasis information is added to the audio data DD is generated. Then, the digital signal EF is subjected to servo (each servo of focus, tracking, rotation, etc.) by the servo drive unit 26 controlled by the servo control signal SC from the CPU 22, and is also passed through the laser control and optical pickup unit 27. Compact disc writable by optical laser (CD-
R) [= optical disc] 28.

Here, the CPU 22 is, as described above,
The data read from the FIFO memory 24 is delayed by a predetermined time d, and during the delay time d, D
The audio level detection signal AL from SP23 is level-determined to detect the start of reproduction, and based on this reproduction start,
It has a function of acquiring emphasis information from the channel status / user data CR and setting the acquired emphasis information as emphasis control information of the digital audio data DD recorded on the optical disc 28. Note that the delay time d set in the FIFO memory 24 may be longer than the time until the emphasis information is acquired, as described later.

When the source device 1 is a CD player or the like, the reproduction start detection method by the subcode continuity detection described above can be adopted instead of the method of using the audio level detection signal AL. In this case, the CPU
22 analyzes whether sub-code signal information such as time information included in the channel status / user data CR separated from the DAI signal AF is analyzed and whether the reproduction of the audio signal is started by monitoring the continuity of the value. Can be determined (for example, it can be determined that the reproduction is started immediately by monitoring that the frame value of the subcode time information is gradually increased). Then, when the reproduction start is detected by this method, each of the units 25 to 26 is similar to the above.
Is controlled to perform the recording operation on the disk 28.

FIG. 2 shows a time chart for explaining the operation on the digital source device side regarding the recording operation of the audio signal recording apparatus according to one embodiment of the present invention, and FIG. 3 shows one embodiment of the present invention. The time chart for explaining the recording operation of the audio data on the digital recording device side executed by the audio signal recording apparatus according to the example is shown.

Here, at time t0, the user, as shown in FIG. 3 (1), uses a CD, which is a digital recording device.
After pressing the recording start command button (not shown) of the recorder 1, as shown in FIG. 2A, the reproduction start command button (not shown) of the digital source device 1 is pressed at time t1. I shall.

By such an operation, first, the CD recorder 1 starts to operate at the recording start command time t0, and at the same time, the CPU transmits the memory control signal MC to the FIFO memory 24, and the operation shown in FIG. The memory 24 is caused to start operating as shown in FIG. Therefore, the FIFO memory 24 initially stores no signal as audio data.
Further, the delay time of the FIFO memory 24 is as shown in FIG.
The time d is set as in (4).

Next, at the reproduction start command time t1, the digital source device 1 starts to operate, converts the reproduction signal into a DAI signal and outputs it [FIG. 2 (2)], whereby the emphasis information is invalid. Changes to valid state from [Fig. 2
(3)]. Therefore, after the time t1, the DAI signal from the source device 1 is transmitted to the DAI receiver section 21 of the CD recorder 2 side.
The digital audio data AD contained in the DAI signal starts to be stored in the FIFO memory 24 via the DSP 23.

The DSP 23, as shown in FIG.
Digital audio data AD output from the digital source device 1 and input to the DAI receiver unit 21
The audio signal level represented by is zero (Infini) during the time t0 to t1 (the time when there should be no signal level).
It is confirmed that the audio signal level is zero (Infinity) after time t1.
The change from Zero) is monitored for a predetermined value Ls or more.
Then, at time t2, the audio signal level becomes zero (I
nfinity Zero) causes a change of a predetermined audio level threshold Ls or more, the DSP 23
As shown in (3), this is detected and an audio level detection signal AL is generated and notified to the CPU 22.

C receiving the audio level detection signal AL
The PU 22 determines that the digital source device 1 has transitioned from the stopped state to the playback state, and as shown in FIG.
The emphasis information of the channel status / user data CR sent from the DAI receiver unit 21 is read. The CPU 22 further generates emphasis control information representing the read emphasis information, and outputs a recording subcode control signal EC containing this emphasis control information to the C subcode control signal EC.
It is sent to the D encoder unit 25, and the read emphasis information is set as emphasis information to be recorded.

As shown in FIG. 3 (4), at the time t3 when the delay time d delayed by the FIFO memory 24 has elapsed from the recording start command time t0, the CPU 22
As shown in FIG. 3 (5), the FIFO memory 24, the CD encoder unit 25, the servo drive unit 26, and the laser control / optical pickup unit 27 are instructed to start data recording on the optical disc 28.

As a result, the FIFO memory 24 sends the digital audio data DD delayed by the delay time d [the data corresponding to the portion initially input (time t0 to t1) is the no signal level] to the CD encoder unit 25. . Then, the CD encoder unit 25 generates an EFM signal having a data content obtained by adding setting emphasis information to the digital audio data DD based on the recording sub-code control signal EC from the CPU 22, and the signal having this data content is used for laser control and It is written on the optical disk 28 via the optical pickup unit 27.

In the embodiment, the digital recording device using the CD recorder (2) which uses the CD-R optical disk (28) as the recording medium has been described, but the present invention is not limited to this, and the emphasis system is not limited thereto. Any digital audio device may be used as long as it is a digital audio device that performs signal processing in a format in which information is included in individual control data such as a subcode. For example, CD-RW recorder, DAT recorder, D
It is applicable to VD audio (for 44.1, 88.2kHz sampling, etc.).

[0038]

As described above, according to the present invention, when the audio signal including the audio data and the control data is input by the reproduction start command after the recording start command,
A delay unit such as a FIFO memory delays audio data for a predetermined time so that the audio data is not recorded on a recording medium such as an optical disk. Also, when the input start of the audio signal is detected, the emphasis information is read from the control data at this input start detection timing to obtain the emphasis, and this emphasis information is set as the emphasis information of the recorded audio data. There is. Then, when the predetermined delay time has passed, the read emphasis information is recorded on the recording medium together with the delayed audio data. Further, in order to confirm the start of input of the audio data, the audio level represented by the audio data is monitored, or the continuity of the subcode values (eg, time information values) included in the control data is monitored. A simple and reliable method is adopted.

Therefore, according to the present invention, when the reproduction start command is issued after the recording start command to record the audio data on the recording medium such as the optical disk, the emphasis information of the audio data is relatively simple as described above. It is possible to record the audio data after the acquisition is performed so that the emphasis information is constant within the same track (song). In addition, as a result, when reproducing this recording medium, there is an effect that there is no possibility of causing troubles such as noise and sound interruption due to switching of emphasis in the middle of a track (song).

[Brief description of drawings]

FIG. 1 is a block diagram showing a system configuration of an audio signal recording device according to an embodiment of the present invention.

FIG. 2 is a time chart for explaining the operation on the digital source device side regarding the recording operation of the audio signal recording apparatus according to the embodiment of the present invention.

FIG. 3 is a time chart for explaining an audio data recording operation on the digital recording device side, which is executed by the audio signal recording apparatus according to the embodiment of the present invention.

[Explanation of symbols]

AF Digital Audio Interface (DA
I) signal, AD digital audio data, PD digital signal processed digital audio data, DD delayed digital audio data, EF EFM signal, CR channel status including emphasis information /
User data, PC DSP control signal, AL audio level detection signal, MC FIFO memory control signal, recording subcode control signal including EC emphasis control information, SC servo control signal, t0 recording start command time, t1 playback start command time, t2 Playback sound rise detection timing, t3 recording start time on optical disc, Ls audio level threshold, d delay time set in FIFO memory.

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Claims (3)

(57) [Claims] 1. A recording start command enables signal reception from a source thereafter, and receives an audio signal reproduced by the source in response to a reproduction start command after the recording start command,
Receiving means for separating the audio signal into control data and audio data, input start detecting means for detecting an input start of the audio signal, and emphasis information from the control data from the receiving means based on the input start detection. And a memory for delaying the non-signal information and the audio data from the receiving means for starting the operation by the recording start command and delaying at least the emphasis information from the recording start command. Means, an emphasis setting means for setting the acquired emphasis information as emphasis information for delayed no-signal information and audio data, and delayed no-signal information and audio data, and
An audio signal recording apparatus, comprising: a recording unit that records control data including set emphasis information on a recording medium. 2. The audio signal according to claim 1, wherein the input start detecting means detects the input start of the audio data by detecting a rising edge of a sound from the audio data included in the audio signal. Recording device. 3. The audio signal recording according to claim 1, wherein the input start detecting means detects an input start of audio data by detecting continuity of subcode values in the control data. apparatus.