JPH06119766A - Disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To unnessecitate a specialized reproducing head for monitoring, to monitor recording by means of the recording/reproducing head of a standard equipment and to attain the simplification and cost reduction of the equipment. CONSTITUTION:In a recording mode, after successively storing input data in a recording memory 9W by means of a controller 10W through an A/D 13 and compressor 11W, a recording head 14 and an optical pickup 3 are moved to the writing address of a disk 1 and the prescribed amount of data is recorded. When once data recording is completed, the recording head 14 and the optical pickup 3 are moved to the reading address of the disk 1 in a standby period until the next recording, the recording data are read out, stored in a reproducing memory 9R and after that, outputted by processing a prescribed reproduction processing. Writing in and reading out are similarly repeated thereafter. Consequently, immediate monitoring at the time of a recording mode is executed with a cheap and simply constructed device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording / reproducing apparatus capable of instantaneous recording monitoring only with a recording / reproducing head provided as standard equipment.

[0002]

2. Description of the Related Art It has been a long time since a compact disc (CD) was developed as a medium superior to an analog record, but some recording media have been developed during this period. One of them is a mini disk (MD), which can be expected to have the portability of a compact cassette and the operability and sound quality of a CD, and it is drawing attention as an audio recording medium in the future.
MD follows the same sampling method as CD,
Since a new audio compression method is adopted, it is possible to realize a high sound quality equivalent to that of a CD with an information amount of about 1/5. For this reason, even a disc that is about half the diameter of a CD
You can achieve the same playback time as.

There are two types of MDs, and a read-only MD that can only be played back uses an optical disk similar to a CD. On the other hand, a recording / reproducing MD capable of recording as well as reproducing uses a magneto-optical disk. Such an MD player that can handle two types of MDs is equipped with not only an optical head for recording / reproducing but also a magnetic head for writing. Recording playback M
An MD player compatible with D has a recording mode for writing recording data to a disc and a reproducing mode for reading reproduction data from the disc, and the user selectively selects these modes.

A monitor function is required to immediately confirm whether or not the input data is surely recorded during recording while selecting the recording mode. This monitor function is different from the normal play mode function. because,
This is because it is necessary to immediately read and reproduce the recorded data while the recording mode is being selected. In the case of an MD player as an example, reproduction data is read using an optical head. This optical head is also used in the recording mode when a magneto-optical disk is mounted. Therefore, if an immediate monitor is to be performed in the recording mode, a separate monitor optical head is required.

[0005]

However, mounting an optical head for a monitor requires peripheral circuits (such as an automatic laser light control circuit and a servo control circuit), which complicates the structure of the structure. It also leads to higher costs. In particular, it is not preferable for an MD player or the like that attaches importance to portability that the size cannot be reduced due to the complexity of the structure and an increase in the number of parts.

The present invention improves the above-mentioned points, and in a disk recording / reproducing apparatus for recording / reproducing a disk as a medium, without mounting a reproducing head for a monitor,
The purpose is to enable immediate recording monitoring with only the standard recording / playback head.

[0007]

In order to achieve the above object, the present invention has a recording mode for writing recording data to a disc and a reproducing mode for reading reproduction data from the disc. In the disk recording / reproducing apparatus which intermittently writes the recorded data and reads the reproduced data, the control is performed so that the data for the recording monitor is reproduced during the write standby period of the recording mode.

A second feature of the present invention is to have a recording mode for writing recording data to a disc and a reproducing mode for reading reproduction data from the disc, wherein the recording mode and the reproduction mode are intermittently recorded data. In a disc recording / reproducing apparatus for writing and reading reproduction data, a recording signal processing unit for processing the recording data and a reproduction signal processing unit for processing the reproduction data are provided independently, and the recording is performed in the recording mode. The recording signal processing unit intermittently writes the recording data, and during the writing standby period, the reproduction signal processing unit performs control so that the recording monitor data reproduction process is performed.

[0009]

In the disc recording / reproducing apparatus for writing the recording data intermittently, the entire time zone of the recording mode is not used for the data writing, and there is a waiting period in which the writing is not performed intermittently. During this waiting period, data is not read except for the address, so that it is possible to reproduce the data for recording monitor during that period. If the recording monitor is used in this way, there is no need to provide a separate reproducing head for the monitor, and therefore the structure is not complicated and it is advantageous for downsizing. Further, the cost required to add a circuit function therefor is smaller than that required to add a reproducing head and its peripheral circuits.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram of a basic MD type disc recording / reproducing apparatus. In the figure, 1 is a disc, 2 is a spindle motor for rotating the disc at a constant linear velocity, 3 is an optical pickup for reading information optically from the disc 1 or writing information magneto-optically on the disc 1, 4 This pickup 3 is a disc 1
Of the feed motor for moving the pickup 3 in the radial direction, 5 is a radio frequency (RF) amplifier for amplifying the output of the pickup 3, 6 is rotation control of the spindle motor 2, feed control of the feed motor 4, and servo control for focus / tracking of the pickup 3. It is a department. The disk 1 is a reproduction-only MD that can only be reproduced, or a recording / reproduction MD that can be recorded as well as reproduced. The optical pickup 3 has a function of reading the information by detecting the intensity of the reflected light amount from the read-only MD using the optical disk, and a function of detecting the difference in the car rotation angle from the recording / playback MD using the magneto-optical disk. And a function of writing information to the recording / reproducing MD by magneto-optical recording.

The reading system of this MD player includes a decoder section of an encoder / decoder 7 for decoding (demodulating) the output of the amplifier 5, an address decoder 8 for detecting an address being reproduced from the output of the amplifier 5, and an encoder / decoder. Memory 9 for temporarily storing the decoded output of 7 and its controller 10, a decompression unit of an audio compression / decompression unit 11 for decompressing the output of the memory 9, and a D for converting the decompression output of the audio compression / decompression unit 11 into an analog signal. And / A conversion unit 12. The encoder / decoder 7 uses EFM (eight to fourteen modulation) as a modulation method and CIRC (cross interleave reed-) as an error correction method.
solomon code) is adopted.

The writing system of this MD player includes an A / D converter 13 for converting an analog signal into a digital signal,
An audio compression / decompression unit 1 for compressing the converted digital signal so as to remove components unnecessary for audio signal reproduction.
1 compression unit and memory 9 for temporarily storing the compressed signal
And its controller 10, an encoder section of the encoder / decoder 7 for encoding (modulating) the output of the memory 9, a recording head (magnetic head) 14 for writing the signal encoded by this encoder section to the disk 1 and its head drive. And the circuit 15. Reference numeral 16 is a system controller for controlling the whole, 17 is a display unit for displaying various information, and 18 is a plurality of operation keys for giving various instructions.

The above-mentioned MD player is based on a CD player, to which voice compression technology, seismic resistance technology, user recording function and the like are added. The voice compression performed by the voice compression / decompression unit 11 is performed by thinning out unnecessary data by utilizing the human hearing characteristics. For example, ATRAC (Adapti
A compression technology called ve Transform Acoustic Coding) uses the minimum audible limit characteristics of human beings and the masking effect to realize about 5 times information compression. The decompression unit for decompressing the compressed data synthesizes the decoded outputs of the encoder / decoder 7 and sequentially reproduces the digital waveform. With this method, when the level is changed in 16-bit steps and the sampling frequency is expressed as 44.1 kHz, the quality equivalent to the signal is reproduced. In order to perform this data compression / expansion, a buffer memory 9 having a corresponding capacity is required on the signal processing circuit.

One of the features that enhances the portability of the MD player is the seismic resistance technology for dealing with "sound skipping". This is realized by utilizing the difference between the read speed of the pickup 3 and the transfer speed of data input to the audio compression / decompression unit 11, and using the memory 9 as a data buffer. That is, the read speed of the pickup 3 is as high as 1.4 Mb (megabit) / s, whereas the transfer speed of data input to the audio compression / decompression unit 11 is as low as 0.3 Mb / s. Therefore, using the 1 Mbit memory 9,
The data for about 3 seconds can be stored. Therefore, even if reading from the disc 1 is stopped due to vibration,
If it returns within seconds, the reproduced audio output does not "skip". The memory 9 is also used during writing. In this case, the audio compression / decompression unit 11 outputs 0.3.
The compressed data output at Mb / s is temporarily stored in the memory 9, read out, and transferred to the encoder / decoder 7 at 1.4 Mb / s. Since writing to the disk 1 by the recording head 14 is performed at 1.4 Mb / s, this writing is intermittent using only a part of the entire processing time.

The advantage of using a recording / playback MD for the disc 1 is that it is writable. Laser light from the magnetic recording head 14 and the optical pickup 3 is used for writing. For this writing method, a magnetic field modulation method is used in which a laser beam having a constant intensity is applied to the lower surface of the disk 1 and a magnetic field modulated with write data is applied from the upper surface.

FIG. 3 is an explanatory diagram showing the intermittent writing described above. In this figure, the horizontal axis represents the time axis and the vertical axis represents the processing flow. The uppermost stage is audio data having a transfer rate of 1.4 Mb / s digitized by the A / D converter 13, and when this audio data is compressed by the audio compressing unit 11, the transfer rate of 0.3 Mb / s shown in the middle stage is obtained. It becomes compressed data. This compressed data is stored in the DRAM 9 and the EFM encoder 7.
To the magnetic head 14 (the head drive circuit is omitted), and the data is written on the disk 1 at a speed of 1.4 Mb / s in terms of audio data. Therefore, a waiting time longer than one writing time is interposed between the writing.

When the magnetic field modulation method is adopted for writing, only the portion irradiated with the laser beam from the optical pickup 3 is magnetized by the magnetic field reversal action of the magnetic head 14 and 1 or 0 information is written. The recording density at this time is determined by the performance of the optical pickup 3, and when the optical constant is the same as that of the CD, the writing transfer rate is 1.4 Mb / s in terms of audio data as described above. Although the write amount and the waiting time per cycle are determined by the system design, there is always the waiting time. Therefore, in the present invention, this period is used for immediate recording monitoring.

FIG. 1 is a block diagram showing an embodiment of the present invention. The disc recording / reproducing apparatus shown in this example is shown in FIG.
Based on the configuration of, the following improvements are added. That is, the recording signal processing unit including the A / D converter 13, the audio compression unit 11W, the recording memory 9W, and the recording memory controller 10W, the reproduction memory 9R, the reproduction memory controller 10R, and the audio expansion unit 11R, D. / A converter 12
The point is that the reproduction signal processing section consisting of is independently provided and they are operated by the same master clock. The other parts are denoted by the same reference numerals as those in FIG. 2, and detailed description thereof will be omitted.

The recording memory 9W is used to temporarily store the write data compressed by the audio compression section 11W. On the other hand, the reproduction memory 9R is used to temporarily store the reproduction data decoded by the EFM encoder / decoder 7. Since the memory controllers 10W and 10R are independently provided for these memories 9W and 9R, read / write operations for the memories 9W and 9R are performed.
The lights can be done independently. When the reproduction mode is set by the operation key 18, data reproduction is performed using the optical pickup 3 and the reproduction signal processing unit. On the other hand, when the operation key 18 is set to the recording mode, data recording is performed using the optical pickup 3, the recording head 14, and the recording signal processing unit. At this time, in the present invention, data reproduction for recording monitor is performed.

The recording mode of the present invention will be described in more detail. As described above, the bit rate (0.3 Mb / s) of compressed data to be recorded in the normal MD player and the bit rate (1.4 Mb / s) of recording on the disc 1 have a ratio of about 1: 5. Therefore, the waiting period shown in FIG.
Reach 4/5 of the total time in recording mode. Similarly, even in the reproduction mode, the reproduction signal is not taken in from the disc 1 for a period of 4/5 of the entire time zone. Therefore, by alternately accessing the disk 1 using the respective standby periods, it becomes possible to perform recording and reproduction in the recording mode.

The recording signal processing unit and the reproduction signal processing unit, which are provided independently, enable immediate monitoring in the recording mode described above. That is, when the recording mode is set, the compressed data processed by the audio compression unit 11W is sequentially accumulated in the recording memory 9W by the recording memory controller 10W. At this time, the system controller 16 controls the servo controller 6 to control the recording head 14 and the optical pickup 3.
Is moved to the write address of the disc 1. In this state, the memory controller 10W reads a specified amount of data from the recording memory 9W and transfers it to the subsequent circuit, so that the data is recorded at the write address of the disk 1. As described above, the recording head 14 and the optical pickup 3 are used for writing data.

When one data recording is completed, the original state of the write mode should be entered, but in the present invention,
Data for monitoring is read during this waiting period. That is, after the recording is completed, the system controller 16 controls the servo controller 6 to move the recording head 14 and the optical pickup 3 as a set to the read address of the disk 1. The read address is the write address of the data record completed immediately before. At this time, the signal read from the disc 1 is decoded by the encoder / decoder 7 and sequentially accumulated in the reproduction memory 9R by the memory controller 10R. The compressed data read from the memory 9R is decompressed by the audio decompression unit 11R and then D / A converted by the D / A conversion unit 12. After that, by repeating writing and reading in the same manner, immediate monitoring in the recording mode becomes possible.

Although the embodiment using the MD as an example has been described above, the present invention is not limited to the MD. That is,
The present invention can be applied to any device that performs intermittent recording as in the MD. Further, the target disk is not limited to the magneto-optical disk, but may be an optical disk, a magnetic disk, or the like.

[0024]

As described above, according to the present invention, in a disk recording / reproducing apparatus for recording / reproducing with a disk as a medium, a recording / reproducing head as a standard equipment is used without mounting a reproducing head for monitoring. Since an immediate recording monitor can be performed, there is an advantage that it can be realized at low cost without complicating the device structure.

[Brief description of drawings]

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

FIG. 2 is a block diagram of a basic MD recording / reproducing apparatus.

FIG. 3 is an explanatory diagram showing intermittent writing of MD.

[Explanation of symbols]

1 ... Disc, 2 ... Spindle motor, 3 ... Optical pickup, 4 ... Feed motor, 5 ... High frequency amplifier, 6 ... Servo control unit, 7 ... EFM encoder / decoder, 7 ... EFM
Encoder, 8 ... Address decoder, 9W ... Recording memory, 9R ... Reproducing memory, 10W ... Recording memory controller, 10R ... Reproducing memory controller, 11W ...
Audio compression unit, 11R ... audio decompression unit, 12 ... D / A converter, 13 ... A / D converter, 14 ... recording (magnetic) head,
15 ... Head drive circuit, 16 ... System controller,
17 ... Display unit, 18 ... Operation keys.

Claims (2)

[Claims] 1. A recording mode for writing recording data to a disc and a reproduction mode for reading reproduction data from the disc, wherein the recording mode and the reproduction mode intermittently write the recording data and reproduce the reproduction data, respectively. In the disc recording / reproducing apparatus for reading, the disc recording / reproducing apparatus is controlled so as to reproduce data for recording monitor during a write standby period in the recording mode. 2. A recording mode for writing recording data to a disc and a reproducing mode for reading reproduction data from the disc, wherein the recording mode and the reproduction mode intermittently write the recording data and reproduce the reproduction data, respectively. In a disc recording / reproducing apparatus for reading, a recording signal processing unit for processing the recording data and a reproducing signal processing unit for processing the reproducing data are independently provided, and in the recording mode, the recording signal processing unit performs the recording. A disk recording / reproducing apparatus, characterized in that data is intermittently written, and during the write standby period, the reproduction signal processing section performs data reproduction processing for recording monitor.