JP2000090571A - Optical information recorder and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical information recorder capable of recording/ reproducing a plurality of information different in transfer rate without varying the number of revolution of an optical recording medium while increasing the number of revolution and keeping the maximum transfer rate. SOLUTION: This optical information recorder for storing input signals inputted at plural different transfer rates in temporary storage means 8, 9, reading out the stored input signals from the temporary storage means and writing them in an optical recording medium D is provided with a storage amount monitoring means 11 for monitoring the storage amount of the temporary storage means 8, 9. The writing of the optical medium is started at the transfer rate faster than any one of plural transfer rates corresponding to that the storage amount monitor means 11 detects a first recording reference value, and the write-in to the optical medium is interrupted corresponding to that the storage amount monitor means 11 detects a second recording reference value smaller than the first recording reference value. Thus, the number of revolution of the optical recording medium is increased to make it into the state of the maximum transfer rate, and a plurality of information different in transfer rate are recorded without varying the number of revolution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a DVD-RAM,
The present invention relates to a recording device or a reproducing device capable of performing recording and reproduction of a DVD-RW or the like, and a recording device and a reproducing device having storage means for temporarily storing data in order to perform compression and decompression of data. Things.

[0002]

2. Description of the Related Art Generally, in a recording / reproducing apparatus using a data compression / expansion technique such as a conventional portable DVD player, for example, an MD, a 4M recording medium corresponding to about 10 seconds is used.
B (hit) has a shock-proof memory, utilizing the temporary storage of data in this memory, while the music signal is being reproduced from the memory, kicks the pickup and reproduces the next sector. Waiting for rotation. At the time of recording, the recording signal is temporarily compressed and temporarily stored in memory, and this signal is read out and recorded intermittently on the disk. I'm waiting.

Similarly, for example, a DVD player similarly has a 4 MB temporary storage memory and transfers signals at a variable transfer rate. For example, when the transfer rate is 8 Mbps, it corresponds to about 0.5 seconds. I have a memory time, and I like to kick and wait for the rotation. At present, it is general to use a DRAM having a storage capacity of 16 MB or more as such a temporary storage memory, and it is necessary to secure a temporary storage time of 2 seconds or more. Can be inexpensive. Incidentally, 64 MB (bit) has a storage time of 8 seconds at 8 Mbps. A technique for recording and reproducing signals at one transfer rate by using a temporary storage memory as described above is disclosed in, for example, JP-A-59-172169 and JP-A-5-128531. Have been.

Meanwhile, a technique for reproducing or recording high-density information using a laser beam is known as described above, and is mainly put to practical use as an optical disk. Optical disks can be broadly classified into a read-only type, a write-once type, and a rewritable type. The reproduction-only type is commercialized as a compact disk on which music information is recorded and a VCD, DVD or the like on which image information is recorded, and the write-once type is commercialized as a CD-R, DVD-R or the like. At present, CD-R
W, DVD-RAM, DVD-RW, and the like are being commercialized as video, audio recording, data files for personal computers, and the like.

[0005] The rewritable type uses a recording thin film which reversibly changes between two or more states by changing the irradiation conditions of a laser beam or the like, and the main types are a magneto-optical type and a phase change type. Of these, phase-change disks record signals by changing the recording film reversibly between amorphous and crystalline by changing the irradiation conditions of laser light,
The difference between the reflectances of the amorphous and the crystalline is detected optically and reproduced. Therefore, similar to the read-only type or the write-once type, the signal can be reproduced as a change in the reflectance of the laser beam, and the overwriting can be performed with one beam by modulating the laser power between the erasing level and the recording level. Therefore, there is an advantage that the device configuration can be simplified.

[0006]

However, in a higher-density disc, the reproduction quality varies due to variations in individual discs, the number of recording times of the disc, and environmental conditions such as ambient temperature. In some cases, a new problem of worsening occurs. As described above, in recording / reproducing in digital compression / expansion, for example, when recording is performed by changing the rotation speed of the disk in order to perform recording / reproducing at a constant linear velocity, for example, even in the case of a phase change medium or a magneto-optical medium, Since the recording is performed in the thermal recording range, there is a problem that the recording characteristics are deteriorated when the rotation speed of the disk is changed. In the compression / expansion recording, especially for data using the MPEG technology, the recording time is switched to, for example, a high image quality transfer rate of 8 Mb.
ps 2 hour mode, transfer rate 4Mbp with slightly higher picture quality
If a desired mode is selected from among the four-hour mode of s and the eight-hour mode with a transfer rate of 2 Mbps for normal image quality, if the image quality moves at a high speed or the image quality moves at random on the entire screen, Even with normal image quality, there is a problem that the quality of image quality drops extremely.

To solve this problem, in order to determine the optimum recording conditions for each disc, test recording is performed to reproduce this signal, and the quality of the reproduced signal is measured. However, it is not practical to perform this at the time of recording, since it takes too much time and there is a problem that a head portion of a signal to be originally recorded cannot be recorded. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made in order to effectively solve the problems. The purpose of the present invention is to increase the rotational speed of an optical recording medium and increase the linear velocity corresponding to the maximum transfer rate. It is an object of the present invention to provide an optical information recording device and a reproducing device capable of recording or reproducing information at a plurality of different transfer rates without changing the rotation.

[0008]

According to the invention defined in claim 1, an input signal input at a plurality of different transfer rates is
In an optical information recording device in which the input signal is stored in a temporary storage means and the stored input signal is read from the temporary storage means and written to an optical recording medium, a storage amount monitoring means for monitoring a storage amount of the temporary storage means is provided. Then, in response to the storage amount monitoring means detecting the first recording reference value, writing to the optical recording medium is started at a transfer rate faster than any of the plurality of transfer rates, and The writing to the optical recording medium is interrupted in response to the amount monitoring means detecting a second recording reference value smaller than the first recording reference value.

Thus, the rotation speed of the optical recording medium is set to a high rotation speed so as to be higher than the maximum transfer rate of the input signal at the time of recording, and the writing speed to the optical recording medium is fixed at the high transfer rate. Keep it. In this state, the compressed data of the input signal is temporarily stored in the temporary storage unit at the transfer rate of each input signal. Then, when the storage amount monitoring means detects the first recording reference value, reading from the temporary storage means and recording on the optical recording medium are started, and the data storage amount of the temporary storage means decreases and the second recording When the reference value is detected, the reading from the temporary storage means is temporarily interrupted. Thereafter, this operation is repeatedly performed. This makes it possible to support a plurality of recording modes without changing the rotation speed of the optical recording medium.

According to a second aspect of the present invention, a reproduction signal read from an optical recording medium is stored in a temporary storage means, and the stored reproduction signal is read from the temporary storage means and output at a plurality of different transfer rates. A reproducing apparatus for optical information, comprising: a storage amount monitoring means for monitoring a storage amount of the temporary storage means, wherein the storage amount monitoring means detects the first reproduction reference value and responds to the optical recording. The reading from the medium is interrupted, and the transfer is faster than any of the transfer rates in response to the storage amount monitoring means detecting a second reproduction reference value smaller than the first reproduction reference value. Reading from the optical recording medium is resumed at a rate.

[0011] Thus, the rotation speed of the optical recording medium is set to a high rotation speed so as to be higher than the maximum transfer rate of the reproduced signal at the time of reproduction, and the reading speed from the optical recording medium is fixed to the high transfer rate. Keep it. In this state,
The information is read from the optical recording medium and temporarily stored in the temporary storage means. Then, the reproduction signal is read out from the temporary storage means at a transfer rate corresponding to each reproduction signal and output. Then, when the storage amount monitoring means detects the first reproduction reference value, the reading from the optical recording medium is temporarily interrupted, and the data storage amount of the temporary storage means decreases, and the second reproduction reference value is reduced. Upon detection, reading from the optical recording medium is restarted. Thereafter, such an operation is repeatedly performed. This makes it possible to support a plurality of reproduction modes without changing the rotation speed of the optical recording medium.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an optical information recording and reproducing apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing a recording / reproducing device in which a recording device and a reproducing device for optical information are combined, and FIG. 2 is an explanatory diagram for explaining the concept of a sector in an optical recording medium (optical disk). In general, a reproducing apparatus and a recording apparatus use many components in common. Therefore, a recording and reproducing apparatus in which both apparatuses are combined will be described as an example. First, the configuration of an optical disc D represented by an optical recording medium has a large number of tracks (not shown) formed concentrically or spirally on the entire recording surface as shown in FIG. As an example, two tracks A and B at positions with different radii are shown. Here, the optical disk D has a linear velocity (CLV: Constant Linear Ve).
Since the rotation of the inner track A is controlled to be constant, one round is divided into four sectors, for example, and the outer track B is divided into eight sectors, for example. The rotation cycle is 40 msec when the pickup means described later is positioned on the inner track A, and 80 when the pickup means is positioned on the outer track B.
msec. Incidentally, as described above, tracks A and B
There are a number of tracks between or on the inner and outer circumferences.

Next, a recording / reproducing apparatus will be described with reference to FIG. In the figure, reference numeral 2 denotes a spindle motor for rotating the optical disk D, and reference numeral 3 denotes an optical pickup having a laser generating unit for generating a laser beam for reading information and a detecting unit for detecting the reflected light of the laser beam applied to the optical disk D. The optical pickup 3 is integrally moved in the radial direction of the optical disc D by a driving mechanism (not shown). Reference numeral 4 denotes a preamplifier unit, which is a circuit for generating a reproduction signal and a servo signal from the signal read by the optical pickup unit 3 and a speed signal for CLV control, respectively. , A tracking error signal generation circuit, a reproduction signal generation circuit, an equalizer circuit, a PLL circuit, a speed signal generation circuit, and the like. The preamplifier unit 4 sends a signal to be recorded to the optical pickup unit 3 during recording. Reference numeral 5 denotes a servo block, which includes a focus control function, a tracking control function, a spindle control function, and the like. Reference numeral 6 denotes a driver unit that operates the optical pickup unit 3 and the spindle motor 2, and performs focus control, tracking control, spindle control, and the like.

Reference numeral 7 denotes a signal processing unit which converts, for example, a reproduced signal into an EFM (Eight to Fourteen M) signal.
decoding) signal into NRZ data, performing error correction processing on the decoded reproduction signal, and obtaining a sector address signal and a data signal. This signal is a signal compressed at a variable transfer rate. Numerals 8 and 9 are temporary storage means such as DRAMs having a storage capacity of about 64 MB, which store the compressed data and absorb the time axis of the variable transfer bit rate. The temporary storage means 8 and 9 are used to store compressed data to be recorded on the optical disc D when recording data on the optical disc D. Here, two temporary storage means 8 and 9 are provided, but these are integrated and one DR
It may be constituted by AM. Reference numeral 10 denotes, for example, an A (audio) -V (video) endoco (encoder / decoder) unit, which decodes the above-described compressed data (during reproduction) and encodes normal data (during recording). have.

A speaker for outputting an audio signal, a display for outputting a video signal, a microphone for inputting an audio signal, a CCD camera for inputting a video signal, and the like are connected to the end decoding unit 10 as necessary. Reference numeral 11 denotes a storage amount monitoring unit that monitors the amount of data stored in the temporary storage units 8 and 9, and reference numeral 12 denotes an external input unit, which inputs a command such as a recording mode using a key or the like. Reference numeral 13 denotes a system control unit composed of, for example, a microcomputer or the like, which controls the operation of the entire apparatus.

Next, the operation of the recording / reproducing apparatus configured as described above will be described. First, the reproducing operation will be described. A reproduction start or recording start command input from the external input unit 12 such as a key input is input to the system control unit 1.
3 judges, and controls the signal processing unit 7 and the servo block unit 5 according to this command. The signal of the optical disk D read by the optical pickup unit 3 is input to the preamplifier unit 4, where a reproduced signal and a servo signal are generated.
The generated servo signal is input to the servo block unit 5, and based on the generated servo signal, a focus drive signal, a tracking drive signal, and the like are supplied to the actuator of the optical pickup unit 3 via the driver unit 6, and the respective controls are performed. It is. Thereby, one round of servo control of the optical pickup unit 3 is performed.

The speed signal is obtained by a PLL (Phase Locked Loop) circuit included in the preamplifier unit 4. The speed signal is sent to a servo block unit 5 and a drive control signal is transmitted through a driver unit 6. The CLV control is performed by controlling the rotation of the spindle motor 2 based on the generated drive control signal. Further, a rotation position signal of a hall element (not shown) of the spindle motor 2 is fed back to the servo block section 5 and a speed signal generated from this signal is used to calculate a constant rotation F
G (Frequency Generator) control is also performed. The frequency characteristics of the reproduced signal are optimized by the equalizer of the preamplifier unit 4 and the PLL (Phas
The PLL is applied by an e-locked loop circuit, and has a jitter value generated by comparing the time axis of the bit clock and the data of the PLL, and performs waveform correction at the time of recording according to the jitter value.

The reproduction signal output from the preamplifier unit 4 is converted into a digital signal by the signal processing unit 7, and synchronization detection is performed from the digital signal. Decoded to NRZ data. The decoded signal is subjected to an error correction process to obtain a sector address signal and a data signal. Since this data signal is a signal compressed at a variable transfer rate, for example, MPEG2, it is temporarily stored in the temporary storage means 8 and 9 to absorb the time axis of the variable transfer rate. The signals read from the temporary storage units 8 and 9 are expanded by the end decorating unit 10 and further separated into audio signals and video signals. At this time, the expansion speed is determined in accordance with various recording modes based on the control data recorded on the optical disc D, and the expansion operation is performed in accordance therewith. Each signal is converted into an analog signal by a D / A converter (not shown), and output as an audio signal and a video signal.

The operation of the temporary storage means 8, 9 will now be described in detail. The storage means 8 and 9 together have a storage capacity of, for example, 64 MB, which corresponds to a time information amount of about 8000 msec when the optical disc is a DVD.
Even at 0 msec, this corresponds to a time margin of about 80 tracks. FIG. 3 is a conceptual diagram showing the state of control of the temporary storage means during reproduction. In FIG. 4, each predetermined value of the data storage amount “full” or “empty” is set in consideration of a certain margin, and the full value is the storage amount 100%.
% Does not mean that the empty amount is 0%. Here, full indicates the first reproduction reference value, and empty indicates the second reproduction reference value smaller than full. At this time, the data amounts of the temporary storage units 8 and 9 are monitored by the storage amount monitoring unit 11, and the values are stored in the system control unit 13.
Has been entered.

Here, it is assumed that the writing speed for recording on the optical disk D is, for example, 10 Mbps. The reproduction mode corresponding to the transfer rate at the time of reproduction includes, for example, a 2-hour mode with a recording time of 2 hours at a high-quality transfer rate of 8 Mbps, and a transfer rate of 4 with a slightly higher image quality.
It is assumed that there are a 4-hour mode with a recording time of 4 Mbps and an 8-hour mode with a recording time of 8 hours at a transfer rate of 2 Mbps with normal image quality. Each transfer rate is lower than the writing speed recorded on the optical disc D. As shown in FIG. 3, when the playback mode is set, the optical pickup unit 3 moves to a predetermined playback track, waits for a start sector, reads out the compression rate at the time of recording from the control data in the playback signal, and reads the compression rate. Wait (area a).
Then, information is sequentially read from the optical disc D, and after monitoring the tracking and focus errors and performing error processing in signal processing as described above, writing to the temporary storage means 8 and 9 is started (b). region). And
When the storage amount exceeds the empty level, reading from the temporary storage means 8 and 9 and decompression operation are started (area c). Thereafter, the reading and decompressing operations are continuously performed until there is no more data in the file. Also,
The reading speed from the optical disc D is determined by the temporary storage means 8,
Of course, it is faster than the reading speed from No. 9.

Then, the reproduction signal from the optical pickup section 3 is written until the data storage amounts of the temporary storage means 8 and 9 become full, and when the data storage amount becomes full, the data is stored in the temporary storage means 16. The writing is temporarily interrupted or prohibited (d area). Then, until the data storage becomes empty (this is usually done by time calculation)
Next, a track kick is performed so that the optical pickup unit 3 comes to a sector to be reproduced, and the optical pickup unit 3 waits. At this time, the next sector number to be reproduced is stored in the system. At this time, the end decorating unit 10 is configured to be settable for each transfer rate. In this manner, thereafter, the continuous reproduction is performed by repeatedly writing and inhibiting the information from the optical disk D to the temporary storage means 8 and 9. In other parts of the illustrated example, e and g
The area is writing to the temporary storage means 8 and 9, and the f and h areas are write-protected.

Here, the relationship between the read speed from the temporary storage means 8 and 9 during reproduction and the amount of storage will be described. The number of rotations of the optical disc D is set to the maximum transfer rate during disc recording,
For example, a transfer rate higher than 8 Mbps, for example, 10M
Rotate to bps. That is, the reading speed from the disk is fixed to this high transfer rate, and in this state, each playback mode is supported. FIG. 3 (A)
Indicates that the read speed from the temporary storage means 8 and 9 is 2 Mbp
s, the writing speed to the temporary storage means 8 and 9 in the b area is 10 Mb
ps, it is 10 Mbps. In the area c where reproduction is started and writing is performed at the same time, 10
-2 = 8 Mbps, the data storage amount increases, writing is interrupted, and reading continues,
Data storage decreases at Mbps speed.

FIG. 3B shows a case where the reading speed from the temporary storage means 8 and 9 is 4 Mbps, and the writing speed to the temporary storage means 8 and 9 in the area b is the same as described above. Since the reading speed is 10 Mbps, it becomes 10 Mbps. 10-4 = 6M in area c where reproduction is started and writing is also performed at the same time
The data storage amount increases at the speed of bps, the data storage amount decreases at the speed of 4 Mbps in the d region where the writing is interrupted and the reading is continued. FIG. 3C shows a case where the read speed from the temporary storage means 8 and 9 is 8 Mbps, and the write speed to the temporary storage means 8 and 9 in the area b is the read speed from the disk in the same manner as described above. Is 1
Since it is 0 Mbps, it becomes 10 Mbps. In the area c where reproduction is started and writing is performed at the same time, the data storage amount increases at a rate of 10−8 = 2 Mbps. In the area d where writing is interrupted and reading is continued, 8 Mbps Data storage decreases with speed. In the above three cases, the transfer rate at the time of reproduction of the optical disk is 10 Mbps,
Since each reproduction rate is set as low as 2, 4, and 8 Mbps, reading from the optical disc D is temporarily interrupted in the standby state of the d, f, and h areas to absorb the time difference, thereby enabling continuous reproduction. Can be regenerated.

Next, the recording operation will be described. FIG. 4 is a conceptual diagram showing the state of control of the temporary storage means during recording. Here, the full data storage amount corresponds to the first recording reference value, and the empty corresponds to the second recording reference value. When recording an input signal, the apparatus first irradiates a laser spot of the optical pickup unit 3 onto the optical disc D, reads an address signal provided in advance on a signal track, and reads an optical pickup onto a target sector to be recorded. After moving the section 3, the transfer rate at the time of recording is set by setting such as key input. For example, as described above, when compressing an image signal input at 10 Mbps as an input signal of an original image, as described above, a two-hour mode with a recording time of 2 hours at a high image quality transfer rate of 8 Mbps, High-quality transfer rate of 4Mbps 4 hours of recording time 4 hours
There are a time mode and an 8-hour mode with a recording time of 8 hours at a transfer rate of 2 Mbps for normal image quality, and the mode can be selected. In addition, the system control unit 13 recognizes key input or external control data for setting a resolution of an image to be recorded, a high-speed scene such as a car race, or a recording time priority, and performs switching. The terminal has a terminal so that the recording time can be changed, and the user inputs from the external input unit 12.

As a recording signal source for outputting an input signal,
A microphone for inputting an audio signal, a video device for inputting an audio signal and a video signal, and the like are used, but are not particularly limited thereto. In the recording mode, the end decoration unit 10 is configured to be able to set each transfer rate, and the user sets the transfer rate. The input signal to be recorded, input from the recording signal source,
At 0, the data is compressed into, for example, MPEG and compressed, and further, an error correction code, an address code, a sync signal, and the like are added by the signal processing unit 7 and are temporarily recorded in the temporary storage units 8 and 9 ( a region). This storage data amount is constantly monitored by the storage amount monitoring means 11, and when the storage data amount becomes full, the data is sequentially read from the temporary storage means 8, 9 and is read to the optical disk D by the optical pickup unit 3. It will be written (area b). During the reading from the temporary storage means 8, 9, the temporary storage means 8,
9, the input signal from the recording signal source side is compressed and written continuously, and as a matter of course, the reading speed is faster than the writing speed.

When the amount of data stored in the temporary storage means 8 and 9 becomes empty, reading from the temporary storage means 8 and 9 and writing to the optical disk D are prohibited, and the optical data is written at the next sector position to be recorded. The pickup unit 3 is positioned, and the kick is repeated here to wait. During this time, the writing of the compressed data into the temporary storage means 8 and 9 is continued (area c), and when the storage data amount becomes full, the temporary storage means 8 and 9 again And the writing to the optical disc D is performed until the storage data amount becomes empty (d area). Thereafter, similarly, the storage data amount in the temporary storage means 8 and 9 is intermittently written to the optical disk D while repeating full and empty. FIG.
(A) shows the case where the transfer rate of the input signal is 2 Mbps, the write speed to the temporary storage means 8 and 9 in the area a is written at 2 Mbps, and the write rate to the optical disc D (the transfer rate) in the area b. Rate) is 10 Mbps, so that 10−2 = 8 Mbps from the temporary storage units 8 and 9
Data is read out at a speed (transfer rate) of s.

In FIG. 4B, the transfer rate of the input signal is 4
Mbps, the temporary storage means 8, 9 in the area a.
Since the writing speed to the optical disk D is 10 Mbps in the area b, the writing speed (transfer rate) to the optical disk D is 10 Mbps.
Data is read at a speed (transfer rate) of 0-4 = 6 Mbps. FIG. 4C shows that the transfer rate of the input signal is 8
Mbps, the temporary storage means 8, 9 in the area a.
Since the writing speed to the optical disk D is 10 Mbps in the area b, the writing speed (transfer rate) to the optical disk D is 10 Mbps.
The data is read at a speed (transfer rate) of 0-8 = 2 Mbps. In the above three cases, the transfer rate of the input signal is set as low as 2, 4, and 8 Mbps with respect to the transfer rate of 10 Mbps at the time of recording on the optical disc. Thus, continuous recording can be performed by absorbing this time difference.

Although the linear velocity control method is the CLV control here, the present invention can be applied to the case where the linear velocity on the inner and outer circumferences is changed to about 30 zones by CAV control and zone CAV control. As a result, the linear velocity is set at each position while the address position of the track is managed by the system control unit 13. The temporary storage means 8 and 9 are buffer memories for temporarily storing the compressed data here.
D generally includes a buffer for absorbing a variable transfer rate, a buffer used for MPEG encoding and decoding, and the like.

[0029]

As described above, according to the optical information recording and reproducing apparatus of the present invention, the following excellent operational effects can be exhibited. According to the present invention, a normal video tape recorder or the like responds by switching a tape speed, a signal system circuit, a servo system circuit, and the like according to a recording mode. Since the optical recording medium is rotated at a transfer rate higher than the transfer rate, and writing or reading from the optical recording medium is performed while referring to the data storage amount of the temporary storage means in this state, the phase change There is no need to change the recording strategy corresponding to the optical recording medium according to the number of revolutions, and a bit PLL switching circuit that applies PLL to data for keeping the linear velocity constant with the change in the number of revolutions; It is possible to eliminate the need for complicated circuit configurations such as switching of the number of revolutions by the spindle servo and switching of the servo band for focusing and tracking.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a recording / reproducing apparatus in which a recording apparatus and a reproducing apparatus for optical information are combined.

FIG. 2 is an explanatory diagram for explaining the concept of a sector in an optical recording medium (optical disc).

FIG. 3 is a conceptual diagram showing a state of control of a temporary storage unit during reproduction.

FIG. 4 is a conceptual diagram showing a state of control of a temporary storage unit during recording.

[Explanation of symbols]

3 ... optical pickup section, 4 ... preamplifier section, 5 ... servo block section, 6 ... driver section, 7 ... signal processing section, 8, 9
... Temporary storage means, 10... Endo deco part, 11... Storage amount monitoring means, 12.
Optical disk (optical recording medium).

Claims (2)

[Claims] 1. An optical information recording apparatus in which input signals input at a plurality of different transfer rates are stored in temporary storage means, and the stored input signals are read from the temporary storage means and written to an optical recording medium. A storage amount monitoring means for monitoring the storage amount of the temporary storage means, and in response to the storage amount monitoring means detecting a first recording reference value, the storage amount monitoring means is configured to determine a storage amount of any of the plurality of transfer rates. Also starts writing to the optical recording medium at a high transfer rate, and in response to the storage amount monitoring means detecting a second recording reference value smaller than the first recording reference value, A recording device for optical information, wherein writing to a disc is interrupted. 2. A reproduction signal read from an optical recording medium,
In the optical information reproducing apparatus, wherein the stored reproduction signal is read from the temporary storage means and output at a plurality of different transfer rates, the storage amount monitoring for monitoring the storage amount of the temporary storage means Means for stopping reading from the optical recording medium in response to the storage amount monitoring means detecting the first reproduction reference value, wherein the storage amount monitoring means Second too small
An optical information reproducing apparatus, wherein reading from the optical recording medium is resumed at a transfer rate higher than any of the transfer rates in response to the detection of the reproduction reference value.