JPH07226027A - Disc recording / reproducing device - Google Patents

Abstract

(57) [Abstract] [Purpose] The structure of the device and disk case is simple,
To enable multi-processing such as simultaneous recording and playback. [Structure] A disk 101 is rotationally driven at a constant angular velocity, and data is recorded or reproduced at a bit rate higher than the bit rate on the display or audio output side. The reproduction data read by the pickup 103 is decoded by the signal processing device 105, temporarily stored in the memory 106A, and read at a low bit rate. The low bit rate recording data is accumulated in the memory 106B, is input to the signal processing device 105 at a high bit rate, is encoded, and is recorded on the disk 101 via the recording amplifier 113. This recording / reproducing operation is repeatedly executed by one pickup.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc recording / reproducing apparatus having a disc as a recording medium.

[0002]

2. Description of the Related Art As a device using a disk as a recording medium, a device capable of simultaneous recording and reproduction has been proposed. For example, as shown in FIG.
To reproduce 01, the motor 302 is rotated, the recording information is read by the pickup 304, the data is reproduced by the reproduction amplifier 305, converted into a reproduction signal by the signal processing device 307, and for example, displayed via the reproduction signal amplifier 308. Supply to the side. On the other hand, for recording, the disc 301 is rotated in the same manner as during reproduction. Input terminal 311
The recording signal is input to the signal processing device 307 and is input to the signal processing device 307 via the recording signal amplifier 309, and the recording format is maintained. The prepared recording signal is recorded by the recording amplifier 306.
Is supplied to the pickup 303 via the
It is recorded in 1. Here, the pickups 304, 30
3, the signal processing device 307, the motor 302, and the like are controlled by the microprocessor 312, and system control such as movement control, data processing mode, and rotation control is performed.

The above system uses two pickups and has some problems. The first problem is how to position the two pickups with respect to the disc. Depending on the shape of the pickup, it may be difficult to make it effective up to the innermost circumference of the disc, strict precision may be required for the positions of the two pickups, or the pickups themselves may need to be downsized, which is expensive in terms of price. Become. The second point is that a disc case for protecting the disc from dust and scratches is required in the present high-density disc, but as shown in FIG. In case of using two pickups, it is necessary to provide two windows 322 and 323 for reading the disc. For this reason, the structure of the disc case 321 itself becomes complicated, and there is a problem in strength.

[0004]

As described above, in the case of an apparatus which enables simultaneous recording and reproduction by using two pickups, two expensive pickups are used, resulting in an increase in the price as a whole. In addition, when the disc is used in a case, there are problems in that the structure of the case is complicated, the strength is high, and the price is low.

Therefore, an object of the present invention is to provide a disk recording / reproducing apparatus which has a simple structure of the apparatus and a disk case and can perform multi-processing such as simultaneous recording / reproducing.

[0006]

DISCLOSURE OF THE INVENTION According to the present invention, there is provided a disc which is rotationally driven at a constant angular velocity and in which data is recorded or reproduced at a bit rate higher than the bit rate on the display or audio output side, and read from the disc. Reproduction data accumulating means for temporarily retaining reproduction data, recording data accumulating means for temporarily retaining recording data for recording on the disc, and track moving means for moving the recording / reproducing head to a desired track. While reproducing data from a desired track is accumulated in the reproducing data accumulating means and read at a low bit rate, the recording data of the recording data accumulating means is recorded at a high bit rate in a desired track at a predetermined time. Means for switching and controlling the operation to be performed.

[0007]

With the above means, even if there is only one recording / reproducing head, the recording / reproducing process can be simultaneously progressed on the recording signal input and reproduction signal display side.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A shows an embodiment of the present invention. Video and audio data is encoded and recorded on the disc 101 using an image compression technique. The disk 101 is rotated by a disk rotating mechanism that uses a motor 102 as a drive source. The information signal of the disc 101 is picked up by the pickup 1
It is possible to read with 03, and it is also possible to write an information signal to the disc 101 with this pickup 103.

During reproduction, the reproduction signal from the pickup 103 is amplified by the reproduction amplifier 104 and input to the signal processing device 105. Here, the data is decoded and reproduced. The reproduction data output from the signal processing device 105 is input to the memory (FIFO) 106A capable of simultaneous writing and reading. This memory 106
The data written in is read out at the data rate necessary for the video / audio reproduction process, and is supplied to the display via the reproduction signal amplifier 107.

The video / audio data for recording is input to the input terminal 11
It is input to the recording signal amplifier 112 via 1 and amplified to a predetermined level. The output signal from the recording signal amplifier 112 is once written in the memory 106B. Next, at the recording timing, it is compression-encoded by the signal processing device 105, supplied to the pickup 103 via the recording amplifier 113, and recorded on the disc 101. Here, the data reproducing position and the data recording position on the disc are determined by the microprocessor 120 controlling the movement of the pickup 103.

FIG. 1B is a timing chart shown for explaining the operation of the above apparatus. In the conventional device, since there are two pickups, the reproducing operation and the recording operation proceed at the same time, and the timing chart as shown in FIG. 2B1 is obtained. However, in the device of the present invention, one pickup is used for reproduction and recording within a predetermined time. For example, the average bit rate required for video / audio processing is 4 Mbps which is a low bit rate, the memory 106A,
When the capacity of 106B is 16 Mbits each and the recording / reproducing bit rate of the disc is 8 Mbps which is a high bit rate, the time required for recording and reproducing is 1.81 seconds, the seek time is 0.28 seconds, and the number of rotations of the disc is 20
In case of 00 rpm, maximum rotation waiting time is 0.027 seconds,
Even if the moving time of the pickup is set to 10 ms, the seek time of 0.28 seconds is more than sufficient. Even if the recording / reproducing bit rate of the disc is an MCAV type disc in which the recording / reproducing bit rate changes from the inner circumference to the outer circumference, there is no problem as long as the bit rate of the inner circumference is 8 Mbps.

In the above embodiment, reproduction and recording are performed in time division, but reproduction and reproduction may be performed in time division. That is, FIG. 2A shows another embodiment of the present invention.
The same parts as those in the embodiment of FIG. 1 are designated by the same reference numerals. In this embodiment, the reproduction signal from the pickup 103 is supplied to the reproduction amplifiers 104 and 104B.
The outputs of the regenerative amplifiers 104 and 104B are demodulated and decoded by the signal processing device 105, and are output to the memory 106 respectively.
It is stored in A and 106B. And each memory 106A,
The data read from the 106B is reproduced signal amplifier 1
It is supplied to the display via 07 and 107B. The rotation of the motor 102, the movement control of the pickup 103, the processing timing of the signal processing device 105, the memory 106A,
The write / read control of 106B is controlled by the microprocessor 120.

By controlling the reproduction position of the pickup 103 with respect to the disc 102, for example, as shown in FIG.
As shown in, it is possible to obtain a use state in which another screen P2 is inserted and displayed in the screen P1 of the display 200. FIG. 2B shows the operation timing. In the case of a conventional device that performs reproduction with two pickups and their respective systems, as shown in FIGS. 2B and 2B1, the processes of reproduction 1 and reproduction 2 are performed in parallel.
However, in this embodiment, reproduction 1 and reproduction 2 in a short time are performed.
Are alternately repeated in a time division manner, and the memories 106A and 106B are
It is possible to continuously reproduce two different channels while reading the reproduction data.

In the first embodiment described above, reproduction and recording are performed in time division, and in the second embodiment, reproduction and reproduction are performed in time division. However, recording and recording may be performed in time division. Good.
That is, FIG. 3A shows another embodiment of the present invention. Figure 1
The same parts as those in the embodiment are designated by the same reference numerals. In this embodiment, recording signals of different channels are supplied to the input terminals 111 and 111B, respectively. Each signal is temporarily stored in the memories 106B and 106A,
Next, each accumulated data is read at high speed, compression-coded by the signal processing device 105, and alternately picked up via the recording amplifiers 113 and 113B.
Is supplied to. Rotation of motor 102, pickup 10
3 movement control, processing timing of the signal processing device 105,
Write / read control of the memories 106A and 106B is performed by
It is controlled by the microprocessor 120.

FIG. 3B shows the operation timing. In the case of a conventional apparatus that reproduces data from two pickups and their respective systems, recording 1 and recording 2 are performed in parallel as shown in FIGS. 3 (B) and 3 (b1).
However, in this embodiment, recording 1 and recording 2 in a short time are performed.
Are alternately repeated in a time division manner, and the memories 106A and 106B are
It is possible to record on two different channels while reading the record data of.

[0016]

As described above, according to the present invention,
The structure of the device and the disc case is simple, and multi-processing such as simultaneous recording and reproduction can be performed.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a second embodiment of the present invention.

FIG. 3 is a diagram showing a third embodiment of the present invention.

FIG. 4 is a diagram showing a conventional disc recording / reproducing apparatus.

[Explanation of symbols]

101 ... Disc, 102 ... Motor, 103 ... Pickup, 104 ... Reproducing amplifier, 105 ... Signal processing device, 1
06A, 106B ... Memory, 107 ... Reproduction signal amplifier,
112 ... Recording signal amplifier, 113 ... Recording amplifier, 120
… Microprocessor.

Claims (5)

[Claims] 1. A disc which is rotationally driven at a constant angular velocity and in which data is recorded or reproduced at a bit rate higher than the bit rate on the display or audio output side, and reproduction data which is read from the disc is temporarily held. Reproducing data storage means, a recording data storage means for temporarily holding recording data to be recorded on the disc, a track moving means for moving a recording / reproducing head to a desired track, and a desired reproduction data storage means. While reproducing data from the track is accumulated and read at a low bit rate,
A disk recording / reproducing apparatus, comprising means for switching control of an operation of recording the record data of the record data accumulating means on a desired track at a predetermined time. 2. A disc which is rotationally driven at a constant angular velocity and in which data is recorded or reproduced at a bit rate higher than the bit rate on the display or audio output side, and first reproduction data read from the disc are temporarily First reproduction data storage means for holding, second reproduction data storage means for temporarily holding second reproduction data read from the disc, and track moving means for moving the recording / reproducing head to a desired track. While reproducing data from a desired track is accumulated in the first reproduced data accumulating means and the accumulated data is read out at a low bit rate, different desired data is reproduced in the second reproduced data accumulating means at a predetermined time. The reproduction data from the track is accumulated, and while the accumulated data is being read at a low bit rate, the first reproduction is performed. A disk recording / reproducing apparatus comprising: means for repeatedly controlling an operation of accumulating reproduction data from the desired track in the raw data accumulating means. 3. A disc, which is rotationally driven at a constant angular velocity and in which data is recorded or reproduced at a bit rate higher than the bit rate on the display or audio output side, and a first record data to be recorded on the disc temporarily. First recording data storage means for holding, second recording data storage means for temporarily holding second recording data to be recorded on the disc, and track moving means for moving the recording / reproducing head to a desired track. While the second recording data is stored in the second recording data storage means at a low bit rate, the first recording data is read out from the first recording data storage means at a high bit rate, The data is recorded on a desired track of the disc, and the first recording data is stored at a low bit rate in the first recording data storage means. And a control means for switching the operation of reading the second recording data at a high bit rate from the second recording data accumulating means at a predetermined time and recording on a different track from the desired track while A disc recording / reproducing apparatus characterized by 4. The disc recording / reproducing apparatus according to claim 1, wherein the recording / reproducing head is an optical head, and the disc is an optical recording / reproducing disc. 5. The predetermined time is determined by the amount of data that the recording data storage means can temporarily hold and the data rate at which the disc reproduces data. Disk recording / playback device.