JP2000298945A - Audio signal recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an audio signal recording device which records emphasis information with a relatively simple constitution so that it may be constant in the same track (music). SOLUTION: When an audio signal AF including audio data AD and control data CR is inputted to this audio signal recording device, the level of audio data or the sub-code value in control data is monitored, and audio data PD is delayed by a FIFO memory 24. When rise AL of sounds of audio data or the continuity of the sub-ode value is detected to confirm the audio input start, emphasis information is read from control data at this detection timing. When the delaytime set in the FIFO memory has passed, read emphasis information EC is recorded in an optical disk recording medium 28 together with audio data DD.

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 apparatus, and more particularly, to an audio signal recording apparatus for recording digital audio data including 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 using a recording medium such as a recorder, emphasis information is recorded as a subcode on a disk together with audio data. For example, in the CD (Compact Disc) format,
Main information indicating an audio signal and subcode information for various controls are recorded together, and the subcode information includes information indicating the presence or absence of so-called “emphasis” that increases the signal amplitude in a specific frequency band. It is included. In addition, since the presence / absence information of emphasis can be set for each music piece recorded in the disc, if the music piece changes, the presence / absence of emphasis may change.

A CD player, DAT (Digital Audio Ta)
pe) A player or the like is a digital source device, and a CD-R
When digital recording of digital audio data from a source device is performed by using a recorder, a CD-RW recorder, or the like as a digital recording device, usually, a recording start operation is performed on the recording device side and then a reproduction start operation is performed on the source device side. . In this case, on the source device side, that is, on the playback device side, data that is invalid as a logical format is continuously output as a digital signal while the physical format is the same as that during the actual playback until the playback is started. For this reason, the recording device records no-signal information (“zero” data as an audio signal) on the disc from the beginning of recording to the start of reproduction on the source device. , Subcode information must be created and added to the no-signal information. Therefore,
The emphasis information must also be set and recorded with or without emphasis.

In the above case, the sub-code information recorded together with the no-signal information at the start of recording on the recording device side includes emphasis information in which the 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 start of recording, the output of data with a valid logical format is started in the reproduced signal, so that the recording device side has predetermined emphasis information. An audio signal is input and recorded on a disc. However, the emphasis information may be different from the emphasis information recorded together with the no-signal information at the start of recording, and if different, the emphasis is switched from the recording time of the reproduction data from the source device and recorded. become. Therefore, when the disc recorded in this way is reproduced by the reproducing apparatus, the reproducing apparatus switches circuits and the like according to the difference of the emphasis information, so that noise or sound cutoff may occur during the reproduction. There is.

As described above, when the source device is started from the stop state, the recording device cannot obtain emphasis information of the source to be recorded from the source device at the start of recording. Recording must be started with the emphasis information indefinite. If the emphasis information that has been recorded on a recording medium such as a disc at the start of recording is different from the emphasis information of the source recorded on the recording medium after reproduction of the source device, the emphasis information may change in the middle of a track (song). A recording medium to be created is created. Therefore, when a recording medium on which emphasis information is recorded differently in such a manner is reproduced, troubles such as noise and sound cutoff due to emphasis switching may occur in the middle of a track (song).

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned inconveniences, and has a relatively simple structure and is capable of recording information on a recording medium such as a disk so that emphasis information is constant in the same track. It is an object of the present invention to provide an audio signal recording apparatus which does not generate noise, sound interruption or the like due to switching of emphasis in the middle of a track (song) during reproduction of the recording medium.

[0007]

According to the main features of the present invention (hereinafter, for convenience of understanding, reference numerals of corresponding embodiments are added in parentheses), audio data (A
D) and an audio signal (A) including control data (CR).
F) input means (21), input start detecting means (23, 22) for detecting the start of audio data input from the audio signal, and emphasis information being obtained from the control data data based on the input start detection. Means (22) for recording the acquired emphasis information together with audio data on a recording medium (28).
24 to 27).

According to another feature of the present invention, means (21) for inputting an audio signal (AF) including audio data (AD) and control data (CR), and detecting input start of audio data from the audio signal Input start detecting means (23, 22), means for obtaining emphasis information from control data based on the input start detection (22), and input at least until emphasis information is obtained (d). Means (24) for delaying the acquired audio data (PD), the acquired emphasis information and the delayed audio data (D
Means (22, 25-) for recording D) on a recording medium (28).
27) is provided.

According to another feature of the present invention, means (21) for inputting an audio signal (AF) including audio data (AD) and control data (CR), and detecting start of input of audio data from the audio signal Input start detecting means (23, 22), means for obtaining emphasis information from the control data based on the input start detection (22), and input at least until emphasis information is obtained (d). Audio data (P
D) delaying means (24), means (22, 25) for setting the obtained emphasis information as emphasis control information (EC) for the delayed audio data (DD), There is provided an audio signal recording device including means (22, 26, 27) for recording the set emphasis control information on a recording medium (28).

[0010] The input start means of the present invention detects the rise of a sound from the audio data (AD) or detects a subcode value (for example, a frame value of time information) in the control data (CR). By detecting continuity, the start of audio data input is detected.

[Operation] According to the main features of the present invention,
In starting a digital recording operation for recording an audio signal (AF) composed of audio data (AD) and control data (CR) including emphasis information on a recording medium (28) such as an optical disk, an input audio signal (AF) is started. AF) is monitored to detect the start of input of audio data, and at this detection timing, emphasis information is obtained from the control data (CR) of the input audio signal (AF).

According to another feature of the present invention, in order to prevent the input audio data (PD) from being recorded on the recording medium (28) from the start of the recording until the emphasis information is obtained, a first-in first-out (FIFO: First-in first-out) is used. -In
First-out) The input audio data (PD) is delayed using a delay means (24) such as a memory. According to another feature of the present invention, when emphasis is acquired, the acquired emphasis information is set as information for emphasis control of audio data (DD) output from the delay means (24). It becomes possible.

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

Therefore, according to the present invention, for example, when the recording start and reproduction start command buttons are sequentially pressed, the audio data (AD) and the control data (CR) are pressed.
Is received, the continuity of the audio level (sound level) represented by the audio data (AD) or the continuity of the subcode value in the control data (CR) is monitored. The audio signal information (PD) is delayed by the means (24). When the start of input of audio data (AD) is confirmed by monitoring the level of audio data and the continuity of subcode values, emphasis information is read from the input audio signal at this detection timing. When the delay time (d) set in the delay means elapses, the read emphasis information (EC) is stored in the recording medium (2) together with the delayed audio signal information (DD).
Recorded in 8).

In order to confirm the start of the audio data input, a method of detecting a rising edge of a sound from the audio data (AD) or detecting continuity of a subcode value such as a frame value of time information is used. With these methods, the start of input of audio data can be detected relatively easily and reliably.

According to the present invention, at the time of recording on a recording medium on a disk or the like, audio signal information is recorded after acquiring emphasis information. Therefore, emphasis information is recorded within the same track (song). Recording can be performed so as to be constant, and when reproducing this recording medium, there is no possibility that a failure such as noise or sound interruption due to switching of emphasis occurs in the middle of a track (song).

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. The following embodiment is merely an example, and various modifications can be made without departing from the spirit of the present invention.

[System Configuration] FIG. 1 is a block diagram showing a 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) It consists of an audio player (for 44.1, 88.2 kHz sampling, 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 receives 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 includes digital audio data AD and “channel status”,
Control data CR (hereinafter referred to as "user data")
It is called “channel status / user data”. ), And each data A in the DAI receiver unit 21
D and CR. The channel status / user data CR separated by the DAI receiver unit 21 is
(Central Processing Unit) 22 while
The digital audio data AD is stored in a 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 which continuously changes with the reproduction of the time information of the reproduction portion or the like. For example, the time information includes time, minute, second, frame (1 second of 1 second) from the beginning of the playback music.
/ 75) and absolute time information similarly indicating 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, as one method for detecting the start of reproduction of the source device 1 as a reproducing device on the CD recorder 2 side, an audio level (sound level) input from the source device 1 is detected. In this case, a method of detecting the start of reproduction can be adopted, but as another method, the channel status / user data CR
Alternatively, a method of detecting the start of reproduction by analyzing the continuity of the subcode signal information included in the user data may be adopted. In the following, description will be made mainly on the former reproduction start detection method based on level detection, but the latter reproduction start detection method based on subcode continuity detection will be supplemented each time.

The CPU 22 generates a DSP control signal PC for setting an audio level detection condition and the like and a memory control signal MC for setting a delay time and the like.
A recording subcode control signal EC and a servo control signal SC including emphasis control information are generated according to the emphasis information in the channel status / user data CR from the I receiver unit 21 and the audio level detection signal AL from the DSP 23, These signals PC, MC, E
C and SC, respectively, DSP23, FIFO memory 2
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, and the audio signal level represented by the audio data AD is monitored.
If s is exceeded, the above-described audio level detection signal AL is generated and output to the CPU 22.

The audio data PD subjected to digital signal processing by the DSP 23 is input to a FIFO memory 24, and read / read is controlled in accordance with a memory control signal MC from the CPU 22. The FIFO memory 24 is delayed by a memory control signal MC, the input audio data PD is read as audio data DD delayed by a predetermined delay time d, and the audio data DD read from the memory 23 is The data is input to the CD encoder 25.

In the CD encoder 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. The digital signal EF is applied via a laser control and optical pickup unit 27 while servo (focus, tracking, rotation, etc. servo) is applied by a servo drive unit 26 controlled by a servo control signal SC from the CPU 22. Compact disc (CD-
R) [= optical disc] 28 is recorded.

Here, as described above, the CPU 22
The data read from the FIFO memory 24 is delayed for a predetermined time d, and during this delay time d, D
The start of playback is detected by determining the level of the audio level detection signal AL from SP23, and based on the start of playback,
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 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.

In the case where the source device 1 is a CD player or the like, the above-described reproduction start detection method based on subcode continuity detection can be adopted instead of the method using the audio level detection signal AL. In this case, the CPU
Reference numeral 22 denotes whether the reproduction of the audio signal has been started by analyzing the subcode signal information such as the time information included in the channel status / user data CR separated from the DAI signal AF and monitoring the continuity of the value. (For example, it is determined that the reproduction has started immediately by monitoring that the frame value of the subcode time information has gradually increased). When the start of reproduction is detected by this method, each of the units 25 to 26 is detected in the same manner as described above.
To perform a recording operation on the disk 28.

FIG. 2 is a time chart for explaining the operation of the digital source device relating to the recording operation of the audio signal recording apparatus according to one embodiment of the present invention, and FIG. 3 is an embodiment of the present invention. 4 is a time chart for explaining an audio data recording operation of the digital recording device performed by the audio signal recording device according to the example.

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

By such an operation, first, the CD recorder 1 starts operating at the recording start command time t0, and at the same time, the CPU transmits a memory control signal MC to the FIFO memory 24, and FIG. The operation of the memory 24 is started as shown in FIG. Therefore, the FIFO memory 24 initially stores no signal as audio data.
The delay time of the FIFO memory 24 is 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 operating, converts the reproduction signal into a DAI signal and outputs it (FIG. 2 (2)), whereby the emphasis information is in an invalid state. To the valid state (Fig. 2
(3)]. Therefore, after time t1, the DAI signal from the source device 1 is transmitted to the DAI receiver 21 of the CD recorder 2 side.
, And the digital audio data AD in the DAI signal starts to be stored in the FIFO memory 24 via the DSP 23.

The DSP 23, as shown in FIG.
The digital audio data AD output from the digital source device 1 and input to the DAI receiver 21
Is zero (Infini) during time t0 to t1 (time when there should be no signal level).
ty Zero), and after time t1, the audio signal level becomes zero (Infinity).
Zero) or more than a predetermined value Ls is monitored.
Then, at time t2, the audio signal level becomes zero (I
nfinity Zero), the DSP 23 performs a change equal to or more than the predetermined audio level threshold value Ls.
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 stop state to the playback state, and as shown in FIG.
The emulation 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 indicating the read emphasis information, and outputs the recording subcode control signal EC including the emphasis control information to the C signal.
The information 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 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), a command to start recording data on the optical disk 28 is sent to the FIFO memory 24, the CD encoder unit 25, the servo drive unit 26, and the laser control and optical pickup unit 27.

Thus, the FIFO memory 24 sends the digital audio data DD (the data corresponding to the part initially input (time t0 to t1) is a no-signal level) delayed by the delay time d to the CD encoder 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 subcode control signal EC from the CPU 22, and the signal of this data content is used for laser control and The data is written on the optical disk 28 via the optical pickup unit 27.

Although the embodiment has been described with respect to a digital recording apparatus using a CD recorder (2) using a CD-R optical disk (28) as a recording medium, the present invention is not limited to this. Any digital audio device that performs signal processing of a format in which information is included in individual control data such as a subcode may be used. For example, CD-RW recorder, DAT recorder, D
It can be applied to VD audio (44.1, 88.2 kHz sampling, etc.).

[Effects of the Invention] As described above, according to the present invention, when an audio signal including audio data and control data is input in response to a reproduction start command after a recording start command, a delay means such as a FIFO memory is provided. Thus, the audio data is delayed by a predetermined time so as not to be recorded on a recording medium such as an optical disk. Further, according to the present invention, the start of audio data input is detected from the audio signal, and at this input start detection timing, emphasis information is read from the control data to obtain emphasis, and the emphasis information is recorded in the audio data to be recorded. Is set as emphasis information. When the predetermined delay time has elapsed, the read emphasis information is recorded on the recording medium together with the delayed audio data. Also, in order to confirm the start of the input of the audio data, the audio level represented by the audio data is monitored, or
A relatively simple and reliable method of monitoring the continuity of the subcode value (for example, time information value) included in the control data is adopted.

Therefore, according to the present invention, at the time of recording on an optical disc or the like on a recording medium, the audio signal information is recorded after acquiring the emphasis information with the relatively simple configuration as described above. The emphasis information can be recorded so as to be constant in (song). In addition, this has the effect of eliminating the risk of noise, interruption of sound, or other trouble due to switching of emphasis in the middle of a track (song) when reproducing this recording medium.

[Brief description of the 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 an operation on a digital source device side regarding a recording operation of the audio signal recording device according to one embodiment of the present invention.

FIG. 3 is a time chart for explaining an audio data recording operation of the digital recording device performed by the audio signal recording device according to the embodiment of the present invention;

[Explanation of symbols]

AF digital audio interface (DA
I) channel status / signal including signal, AD digital audio data, PD digital signal processed digital audio data, DD delayed digital audio data, EF EFM signal, CR 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 Reproduction sound rising detection timing, t3 Recording start time on optical disc, Ls audio level threshold, d Read delay time set in FIFO memory.

Claims (5)

[Claims] An input unit for inputting an audio signal including audio data and control data; an input start detection unit for detecting an input start of audio data from the audio signal; and an emphasis control unit based on the input start detection. An audio signal recording apparatus, comprising: means for acquiring information; and means for recording the acquired emphasis information together with audio data on a recording medium. Means for inputting an audio signal containing audio data and control data; input start detecting means for detecting the start of input of audio data from the audio signal; and emphasis control from the control data based on the input start detection. Means for acquiring information, means for delaying input audio data at least until emphasis information is acquired, and means for recording the acquired emphasis information and delayed audio signal information on a recording medium. An audio signal recording device, comprising: 3. An input means for inputting an audio signal containing audio data and control data; an input start detecting means for detecting the start of input of audio data from the audio signal; Means for obtaining information; means for delaying input audio data at least until emphasis information is obtained; means for setting the obtained emphasis information as emphasis control information for the delayed audio signal information An audio signal recording apparatus, comprising: a unit for recording the delayed audio signal information and the set emphasis control information on a recording medium. 4. An apparatus according to claim 1, wherein said input start detecting means detects the start of input of audio data by detecting a rise of a sound from the audio data.
The audio signal recording device according to any one of the preceding claims. 5. The apparatus according to claim 1, wherein said input start detecting means detects the start of input of audio data by detecting continuity of subcode values in control data.
The audio signal recording device according to any one of claims 1 to 3.