JP2000215606A - Cd recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent formation of wasteful dead tracks by a simple constitution. SOLUTION: In a CD recorder 2, a digital audio interface(DAI) receiver part 21 separates a digital audio data AD and a control information CR from a DAI signal from a digital source device 1 and inserts the audio data AD to a FIFO memory 23 interposed between the receiver part and a CD encoder part 24. A CPU 22 checks a copyright display bit of the control information CR for a minute delay time applied to the memory 23 by a memory control signal MC, and determines whether or not the data AD stored in the memory is to be recorded on a disk 27. Only the audio data AD permitted to be recorded is read out from the memory 23 and recorded to the disk 27 through a laser control and optical pickup part 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a CD recorder, and more particularly, to a CD recorder for recording digital data including identification information indicating whether copying is possible.

[0002]

2. Description of the Related Art Generally, when digital audio data is recorded by a CD (Copact Disk) recorder, a consumer device uses an SCMS (Serial Copy Manageme).
nt System). For example, CD, MD (Mini Disk), DAT (Digital Aud
When digitally dubbing audio signals from consumer digital source devices such as io Tape), the CD recorder detects the channel status of the digital audio interface signal and the copyright indication bit of the subcode data in the user data according to the SCMS standard. Then, it is necessary to determine whether digital copying is possible.

In particular, CDs and CD-Rs (Copact Disk-Reco
When recording a digital audio signal from an rdable) or the like by a CD recorder, information that can be used to identify whether recording is possible or not is a subcode in user data included in the input digital audio interface signal. The data is recorded as copyright indication bits in the data, and the CD recorder needs to detect the copyright indication bits.

It takes about 107 milliseconds (ms) to monitor the copyright indication bit. If the copy prohibition is detected as a result of monitoring the copyright indication bit, the recording of the CD recorder must be stopped. When identifying the channel status data, the alternation frequency 4-1 in the channel status is used.
The right or wrong of the recording is identified by referring to the 0 Hz copyright indication bit. As a result of the identification, about 100 to 250 ms
If the copy prohibition is detected later, the situation of stopping the recording of the CD recorder is also the same.

For example, in a conventional CD recording method for updating the track number and index number of audio data being recorded based on subcode information in user data of a digital audio interface signal, FIG.
As shown in FIG. 1, a receiver unit R of a digital audio interface (DAI) is transmitted from a consumer digital source device S such as a CD or CD-R by a CD recorder R.
When recording a digital signal on a writable compact disc CD-R via the CD-R1, a central processing unit (CPU: Central Processing Unit) is issued when a user instructs to start recording.
it) R2 converts the digital audio signal received by the receiver unit R1 into a disk CD-R via a CD encoder unit R3 and a laser control and optical pickup unit R4.
Control to start recording digital audio data in

[0006] The processing device R2 determines whether the digital audio data can be recorded or not while recording the data, so that the channel status in the DAI signal and the subcode in the user data can be recorded. Check the right indication bit. When the digital audio data of the DAI signal is not to be recorded, the data recording operation is immediately stopped by the processing device R2. Here, when the copy prohibition is detected by checking the identification information called the copyright indication bit, as shown in FIG.
R, laser control and optical pickup unit R
4 and a new track number (TNO) “m + 1”, data recording A of time a (for example, about 107 ms in the case of a CD source) is progressing.

As described above, according to the conventional method, data is temporarily recorded on the disk CD-R even when copying is prohibited. Also the truck number (TNO) "m
+1 ". As a result, following the unused recording portion A, according to the CD-R standard,
This time, it is necessary to create an empty track m + 1 for the time b during which the silent state B was recorded, that is, for about 4 seconds. In other words, according to the related art, as shown in FIG. 2, the user sets a track m + 1 including a recording portion A having a recording validity determination time a (for example, approximately 107 ms) and a silent portion B having a recording time of approximately 4 seconds (sec). It must be created as an empty track that cannot be used.

[0008]

SUMMARY OF THE INVENTION In view of such inconvenience, the present invention has been inevitably created in order to comply with the SCMS rules when digital recording is performed as a consumer device using a CD recorder. It is an object of the present invention to provide a CD recorder which can eliminate unnecessary empty tracks with a relatively simple configuration.

[0009]

A CD recorder according to the present invention has control information detecting means for detecting control information contained in an input digital signal, and means for storing data contained in the digital signal in a memory. And a means for determining whether or not data stored in the memory is to be recorded on the disk based on the control information detected by the control information detecting means, and more specifically, a digital audio interface to be inputted. Control code detecting means for detecting a control code included in the signal, means for storing audio data included in the digital audio interface signal in the memory, and, based on the control code detected by the control code detecting means, Decide whether to record audio data stored in memory to disk And it includes a stage.

[0010] In the CD recorder according to the present invention,
When it is determined that the data is to be recorded on the disk, the delay time is set in advance so that the data to be recorded on the disk from the memory is read out after a predetermined delay time after being stored in the memory.

[Operation] According to the present invention, the digital audio interface (D)
AI) Before recording digital data such as digital audio data included in a signal on a disk such as a compact disk, the digital data is stored in a memory, and a predetermined reading is performed when data is determined to be recorded on the disk. Delay for a very short time,
During this delay time, the copyright indication bit is checked to determine whether the corresponding digital data is to be recorded on the disk.

As described above, according to the present invention, the digital data is read from the memory and recorded on the disk after the recording on the disk is determined. Therefore, only the digital data permitted to be recorded is recorded on the disk. Digital data that is recorded in the
No part is recorded. Therefore, according to the present invention, it is possible to eliminate the need to create an empty track as in the related art by using a simple memory device such as a FIFO memory.

[0013]

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. 3 is a block diagram showing a system configuration of a CD recorder according to an embodiment of the present invention. A digital audio interface (DAI) signal AF from a consumer digital source device 1 such as a CD or CD-R is transmitted to a digital audio interface (DAI) receiver unit 11 in the CD recorder 1.
Is received by This DAI signal AF includes digital audio data AD and “channel status”,
It contains control data CR called “user data” and is separated into respective data AD and CR by the DAI receiver unit 11.

The subcode data CR in the user data separated by the DAI receiver unit 11 is input to the CPU 22, and the CPU 22 generates a memory control signal MC and a recording subcode control signal RC according to the subcode data CR in the user data. And a servo control signal SC. These signals MC, RC and SC are used to generate FIFO memories 23 and C, respectively.
The D encoder section 24 and the servo drive section 25 are controlled. On the other hand, the digital audio data AD
In accordance with the memory control signal MC from the memory 22, the data is input to a first-in first-out (FIFO) memory 23, and reading from the memory 23 is controlled.

In a normal case (recording is permitted), F
The I / O memory 23 is delayed by a memory control signal MC from the CPU, and the input digital audio data DA is read out as delayed digital audio data DD with a predetermined delay time d, and the audio read out from the memory 23 is read out. The data DD is input to the CD encoder 24. In the CD encoder 24, the delayed digital audio data DD and C
Based on the recording subcode control signal RC from the PU 22, an EFM (Eight to Fourteen Modulation) digital signal EF in which the control data is converted or controlled into predetermined subcode data is generated. The digital signal EF is applied to the servo drive unit 25 controlled by the servo control signal SC from the CPU 22 while performing servo (focusing, tracking, rotation, and other servos) through the laser control and optical pickup unit 26. Compact disc (CD-R) writable by optical laser
27 is recorded.

Here, as described above, the CPU 22
The data reading from the FIFO memory is delayed for a predetermined time d, and during this delay time d, the channel status or the copyright display information of the sub-code in the user data is detected. A function is provided for determining whether or not an instruction has been given. The delay time d may be equal to or longer than the determination time a required from the start of the DAI signal AF to the determination of the copyright indication bit. For example, corresponding to the case where a = about 107 ms,
A very small time value of about 107 ms or more is selected. And
If it is determined that the copyright indication bit indicates copy prohibition, the FIFO memory 23 and the CD encoder are controlled so that no data is recorded on the disk 27 for the digital audio data corresponding to the copyright indication bit. It controls the unit 24 and the servo drive unit 25.

FIG. 4 shows a CD according to an embodiment of the present invention.
The processing flow of the data recording operation performed by the recorder is shown. This processing flow is started when the CPU 22 detects the update of the track number in the subcode data in the user data of the DAI signal. First, in step S1, a predetermined delay time d (d = about 107 to 250 ms) is set in the timer of the CPU 22, the timer is started, and the process proceeds to step S2.

In step S2, the channel status or the copyright indication bit of the subcode in the user data is detected, and this detection operation is continued until it is determined in step S3 that the delay time d has expired. After the delay time d has elapsed, the process proceeds to step S4, where it is determined whether or not the detected copyright indicator bit indicates "copy prohibition". If "copy prohibition" is indicated, step S4 is performed. Proceed to S5, otherwise proceed to Step S6.

If the process proceeds to step S5, the digital audio data A corresponding to the copyright indication bit is read.
As for D, the FIFO memory 23 and the CD encoder 24 are used so that no data is recorded on the disk 27.
And the servo drive unit 25 to execute a recording stop operation.

On the other hand, when the process proceeds to step S6, the CD
In the encoder unit 24, a new subcode such as a track number (TNO) is set for the digital audio data AD corresponding to the copyright indication bit based on the recording subcode control signal RC from the CPU 22. Then, in step S7, the servo drive unit 25 is controlled so that the EFM digital signal EF of the predetermined subcode generated by the CD encoder unit 24 is recorded on the disk 27 via the laser control and optical pickup unit 26.
To start or continue digital signal recording.

FIG. 5 is a time chart showing an operation example of the CD recorder according to one embodiment of the present invention. In this example, the DAI signal AF input to the DAI receiver unit 21 for recording from the consumer digital source device 1 is:
Track n-1 for which copying is permitted is followed by track n for which copying is permitted and track n + 1 for which copying is prohibited, and at time to, the DAI signal AF (n- Digital signal EF in which track number m-1 is set corresponding to 1)
It is assumed that (m-1) is being recorded on the disk 27.

At time t1, when the DAI signal AF (n) of the next track n for which copying is permitted is received, at time t2 when the discrimination time a has elapsed, the subcode CRn of the next track n is identified by the identification. Permission (OK) is detected, and a new track number m corresponding to the next track n is set. Then, at time t3 when the delay time d set in the FIFO memory 23 has elapsed, recording of the digital signal EF (m) of the new track number m is started in the digital audio data AD (n) of the track n.

On the other hand, at time t'1, the DAI signal AF of the next track n + 1 for which copying is prohibited is performed.
When (n + 1) is received, the sub-code CRn +
Copy prohibition (NG) is detected by the identification of 1. In this case, the delay time d elapses and the FIFO memory 2
3 to digital audio data A of the immediately preceding track n
After time t'3 when reading of D (n) is completed,
The operations of the O memory 23, the CD encoder unit 24, and the servo drive unit 25 are stopped, and no digital signal corresponding to the DAI signal AF (n + 1) of the track n + 1 is recorded on the disk 27.

As described above, the DAI receiver 21 and the CD
A delay d is applied to the digital audio data DA by inserting a FIFO memory 23 between itself and the encoder unit 24. During this delay time d, the CPU 22 determines the copyright indication bit, and if the copy is permitted, By controlling recording start or recording continuation, and by controlling recording stop if copying is prohibited, useless empty tracks are not created as in the prior art of FIG.

In the above-described embodiment, the description has been given of the compact disc (CD-R) which can be written only once, but the rewritable compact disc (CD-RW) can be used.
It is applicable as it is.

[Effects of the Invention] As described above, according to the present invention, data contained in an input digital signal is temporarily stored in a memory, while data contained in the digital signal is stored in the memory. Control information is detected, and based on the detected control information, it is determined whether or not data stored in the memory is to be recorded on the disk. More specifically, a digital audio interface (D
AI) Before digital data such as digital audio data included in the signal is recorded on a disk such as a compact disk, the digital data is stored in a memory, and a predetermined small amount of data is read when it is determined to be recorded on the disk. A delay is applied by a time, and during this delay time, the copyright indication bit is checked to determine whether or not to record the corresponding digital data on the disk.

As described above, according to the present invention, after the digital data is determined to be recorded on the disk, the digital data is read from the memory and recorded on the disk, so that only the digital data permitted to be recorded is recorded on the disk. Digital data that has been recorded and for which recording is prohibited is not recorded at all. Therefore, according to the present invention, the use of a simple memory device such as a FIFO memory can prevent the useless empty track from being created unlike the related art.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a conventional CD recording system.

FIG. 2 is a diagram for explaining a data recording mode on a compact disc according to the related art.

FIG. 3 is a block diagram showing a CD recorder system according to one embodiment of the present invention.

FIG. 4 is a diagram showing a processing flow of a data recording operation executed by the CD recorder according to one embodiment of the present invention.

FIG. 5 is a time chart showing an operation example of the CD recorder according to one embodiment of the present invention.

[Explanation of symbols]

AF digital audio interface (DA
I) signal, AD digital audio data, CR channel status and subcode data in user data, DD delayed digital audio data, EF EFM signal, MC FIFO memory control signal, RC recording subcode control signal, SC servo control signal A, the time required to determine whether data is recorded correctly; b, the silence period; d, the read delay time set in the FIFO memory; and TNO, the track number.

Claims (4)

[Claims] 1. A control information detecting means for detecting control information contained in an input digital signal, a means for storing data contained in a digital signal in a memory, and a control information detected by the control information detecting means. A CD recorder comprising: means for determining whether to record data stored in a memory on a disk based on control information. 2. A method according to claim 1, wherein when the data to be recorded on the disk is determined to be recorded on the disk, the read delay time is preset so that the data is read from the memory after a predetermined delay time after being stored in the memory. The CD recorder according to claim 1, wherein: 3. Control code detecting means for detecting a control code included in an input digital audio interface signal, means for storing audio data included in a digital audio interface signal in a memory, and control code detection A CD recorder comprising: means for determining whether or not audio data stored in a memory is to be recorded on a disc based on a control code detected by the means. 4. When audio data to be recorded on a disk is determined to be recorded on the disk, the delay time is set in advance so that the audio data is read from the memory after a predetermined delay time after being stored in the memory. The CD recorder according to claim 3, characterized in that: