JPH0727676B2 - Digital Odeo Disc Recording System - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording system for digital audio discs, particularly so-called compact discs (hereinafter referred to as "CDs").

Configuration of conventional example and its problems Standards and specifications regarding CD have been announced by Philips, and each company has introduced CD production equipment.In particular, laser light and optical modulator are used among them. An apparatus for recording on a glass master by modulating a signal of a CD format is important, and it is desired that a recording zone for the signal can be set with high accuracy and that the operability is high.

In the case of a CD, it is stipulated that a digital signal of CD-formatted audio is recorded on the disc after a diameter of 50 mm. Therefore, in the music source, the audio data is actually
It is important to match the timing when the signal is converted to the CD format and the converted signal is supplied to the optical modulator of the recording device with the timing when the relative distance between the recording head and the center of the disk becomes 50 mm in diameter. Becomes

A conventional CD recording system will be described with reference to FIG. (1) is a video tape recorder (hereinafter referred to as "VTR"), which is a P format for audio in the video format.
The CM signal and SMPTE time code are recorded. The PCM audio processor (2) decompresses the video format of this PCM signal, converts it into audio serial data, and converts it into the CD format encoder (3).
And the output signal (A) is sent to the recording device (4). (5) is a linear scale for detecting the relative distance between the recording head and the center of the disk in the recording device (4), and (6) is the time for reading the time code recorded with the audio data in the VTR (1). It is a code reader.

When recording, first, while monitoring the display of the time code reader (6), the VTR (1) is activated, and the VTR (1) is stopped at the start time at which the known audio data is recorded. Next, start the recording device (4), change the relative distance between the recording head and the center of the disk at a predetermined track pitch, and monitor the linear scale (5). VTR
Start (1). Therefore, at this point, the position where the audio data is recorded on the disc and the timing in time match, but since a series of these operations are performed manually and visually, the error in the recording position is large, VTR
The error is large even when (1) is stopped at the beginning time of the audio data. Moreover, since the operability is worse than anything else, the burden on the operator who operates this system is very heavy.

It is an object of the present invention to solve the above-mentioned conventional drawbacks, and to provide a recording system for a digital audio disc capable of improving the position and time accuracy at the start of recording and improving the operability. With the goal.

To achieve the above object, a recording system for a digital audio disc according to the present invention changes a relative position of a recording head, an optical modulator, a motor for rotating a turntable, a center of the disc, and the recording head. A video recorder capable of playing back a tape having a recording device having a feeding mechanism and audio data pre-recorded in a PCM format in a video format, and a time code recorded with the audio data, and capable of remote control. A tape recorder and a PCM audio processor that converts the playback audio data from this video tape recorder from the video format to serial data,
An encoder that converts the output audio data of this PCM audio processor into a CD format, a linear scale that detects the relative distance between the center of the disk and the recording head in the recording device, and is recorded together with the audio data when the video tape recorder is played back. A time code reader for reading the time code, a linear velocity setting device for setting the rotational linear velocity of the disk in the recording device, and the video tape by the data from the time code reader, the linear scale and the linear velocity setting device. It is configured to include a computing device that outputs a remote control signal of the recorder. With such a configuration, the video tape recorder is stopped at a time when the time code is a predetermined time before the recording start value, and the position information before the recording start point by the linear scale is time information up to the recording start point by the rotation speed setting means and the arithmetic unit. When a certain time value of the time code and the converted time information match, the remote control signal that puts the video tape recorder in a reproduction state is output, so that the recorded information is automatically recorded at a predetermined position. It can be played.

Description of Embodiments An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a recording system for a digital audio disc according to an embodiment of the present invention.
(7) is VTR, (8) PCM audio processor, (9)
Is an encoder, (10) is a recording device, (11) is a linear scale, (12) is a computing device, (13) is a time code reader, and (14) is a linear velocity setting device. The VTR (7)
Corresponds to the VTR (1) in FIG. 3, but has a function capable of remote control (for example, PLAY, STOP) by a command from the arithmetic unit (12). The PCM audio processor (8) and the encoder (9) are the third
It is the same as the PCM audio processor (2) and encoder (3) in the figure. The recording device (10) corresponds to the recording device (4) in FIG. 1, but since CLV (constant linear velocity) recording is performed on a CD, the linear velocity (1.2 m / s-1.
The linear velocity setting device (14) inputs the data into the recording device (10) and also into the arithmetic device (12) so that the speed can be changed at 4 m / s). Further, the linear scale (11) and the time code reader (13) correspond to the linear scale (5) and the time code reader (6) shown in FIG. 3, but the output data of each is the arithmetic unit (12). Entered in. That is, in the system shown in FIG. 1, the arithmetic unit (12) determines the time code recorded on the VTR (7) together with the audio signal, the relative distance between the recording head and the center of the disk, and the linear velocity data. Then, the disc recording start position is automatically matched with the timing at which the audio data is converted into the CD format and sent to the recording device (10). Arithmetic equipment (12)
Although its operation can be freely set by a program, the operation of the program adopted in this embodiment will be described with reference to FIG.

First, in the initial state, although omitted in FIG. 2, VT
R (7) is automatically rewound, and after that, it is set to "PLAY" (step). Next, while monitoring the data from the time code reader (13), when the time code recorded with the voice data in the VTR (7) is ₁ second before the voice data start T, the VTR (7) is stopped. (Step) The arithmetic unit (12) monitors the data from the linear scale (11) (relative distance from the center of the disk), and when the value becomes φ ₁ , the command to put the VTR (7) in the "PAUSE" state. outputs a, when further became the φ _2, and outputs a command to again "PLAY" (step ~). Therefore, if the program of the arithmetic unit (12) is set in advance so that T ₁ second coincides with the time when the distance from the center of the disc changes by 50-φ ₂ mm in the recording device (10), The timing at which the recording head passes a position 50 mm from the center on the disk coincides with the timing at which the audio data is CD-formatted and sent to the recording device (10). The VTR (7) is temporarily in the "PAUSE" state in order to reduce the time error in consideration of the servo system pull-in time in the VTR (7) from "STOP" to "PLAY". And
Φ ₁ shown in the step may be any value as long as it is smaller than φ ₂ . In the recording device (10), the time t at which the relative distance between the center of the disk and the recording head changes by 50-φ ₂ mm
Can be calculated by the following formula. I.e. Becomes However, in the above formula, π is the circular constant, V ₀ is the linear velocity, and P is the track pitch. Therefore, if t = T ₁ in the above equation, Then, φ ₂ for changing from VTR (7) “PAUSE” state to “PLAY” in the step is obtained. In the above equation, V ₀ is the linear velocity, is due to the linear velocity setting device (14), the track pitch P is constant (1.6 μm for CD), and T ₁ is appropriately determined in advance, and the arithmetic device ( 1
By inputting it into the memory of 2), the specific calculation in the above formula becomes possible. Therefore, a program capable of performing the operation shown in the above equation is applied to the arithmetic unit (12), φ ₂ is calculated, and when the value of the linear scale (11) and the value of φ ₂ match, the VTR (7) If the state is changed from "PAUSE" to "PLAY", the timing when the relative distance between the center of the disc and the recording head becomes 50 mm in the recording device (10) and the audio data from the VTR (7) to the PCM audio processor (8) )
Also, it is possible to match the timing to be sent to the recording device (10) through the encoder (9).

As described above, according to the present invention, when recording a CD, it is possible to match the audio recording start position on the disc with the timing at which the audio data is actually recorded, so that the error is extremely small. It can be anything. Also, reading the relative distance between the center of the disk and the recording head, and reading the time code recorded along with the audio data on the video tape recorder,
In addition, the operation of the video tape recorder is automatically performed, and therefore the operator does not have to manually operate it, so that the value is extremely accurate and the burden on the operator is reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of a recording system for a digital audio disc according to an embodiment of the present invention, FIG. 2 is an operation explanatory diagram of the same recording system, and FIG. 3 is a conventional digital audio disc recording system. It is a block diagram. (7) …… Video tape recorder, (8) …… PCM audio processor, (9) …… Encoder, (10) ……
Recording device, (11) …… Linear scale, (12) …… Computing device, (13) …… Time code reader, (14) …… Linear velocity setting device

Claims (2)

[Claims] 1. A recording apparatus including a recording head, a motor for rotating and driving a disk, a feeding mechanism for changing the relative position of the center of the disk and the recording head, and a recording signal modulating means. A video tape recorder capable of playing back a tape in which audio data PCM-converted in advance in a video format is recorded and a time code is recorded together with the audio data, and which can be remotely controlled, and the video tape recorder. Conversion means for converting the reproduced audio data from the recording medium into a predetermined format, a linear scale for detecting the relative position between the center of the disk and the recording head in the recording / reproducing device, and the audio data recorded together with the audio data during reproduction of the video tape recorder. A time code reader for reading the time code, Setting means for setting the rotational linear velocity of the disk in the recording device, time information read from the time code reader, the relative position information read from the linear scale, and a set value by the rotational linear velocity setting means. And a determining means for determining the timing of transmitting the remote control signal of the video tape recorder according to a predetermined procedure. 2. The video tape recorder is stopped at a fixed time before the time indicated by the time code of the recording start point on the tape where the recording of the audio data is started, and the deciding means is the converted relative position on the disk. Of the converted relative position such that the recording head moves and reaches from the converted relative position to the recording start point on the disc where the recording of the recorded signal becomes possible during the passage of the certain time. Position information is calculated, and when the relative position information read from the linear scale and the converted relative position information match, a remote control signal for putting the video tape recorder into a reproduction state is transmitted. A recording system for a digital audio disc according to claim 1.