JP2004265577A - Recording device, recording method, optical information recording and reproducing apparatus, and optical recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical information recording and reproducing device capable of performing two-pass control approximately in real time with one memory system. <P>SOLUTION: The device has a first temporal memory means 9A for a compression input signal of a first compression rate, a difficulty level extracting means 12 at the time of compression of the input signal, a memory quantity monitoring means 11 of the first temporal memory means 9A, and a second temporal memory means 9B for the signal read-out from an optical recording medium. The memory quantity monitoring means 11 starts temporary writing to the optical recording medium in response to detection of a first recording reference value. The memory quantity monitoring means reads out the temporary write signal first to the optical recording medium during the interruption period of the writing of the temporary writing to the optical recording medium in response to the detection of a second recording reference value smaller than the first recording reference value, recompresses the readout signal at the compression rate meeting the difficulty level extracted by the difficulty level extracting means and performs regular writing of the recompression signal read-out from the second temporal memory means to the optical recording medium. The two-pass control is possible approximately in real time with one memory system at the time of recording to the optical recording medium. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a recording / reproducing apparatus capable of recording / reproducing an HDD, an MO, a DVD-RAM, a DVD-RW, etc., and a recording apparatus for performing compression / decompression of data, a recording method, and optical information The present invention relates to a recording / reproducing device and an optical recording method.

  In general, a recording / reproducing apparatus using a data compression / expansion technique, such as a conventional portable DVD player, for example, an MD has a 4 MB (hit) shock proof memory corresponding to about 10 seconds. While music signals are being reproduced from the memory using the temporary storage of data, the pickup is kicked and the rotation is waited for the sector to be reproduced next. 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 the signal transfer is performed at a variable transfer rate. For example, at a transfer rate of 8 Mbps, a storage time corresponding to about 0.5 seconds is required. I also have a kick and wait for rotation. At present, it is general to use a DRAM having a storage capacity of 64 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. By the way, 64 MB (bit) has a storage time of 8 seconds at 8 Mbps and a storage time of 32 seconds at 8.8 Mbps at 256 MB. A technique for recording and reproducing a signal 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.
JP-A-59-172169 Japanese Patent Application Laid-Open No. 5-128531 JP-A-10-98710

  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, rewritable CD-RW, DVD-RAM, DVD-RW, and the like are being commercialized as video, audio recording, data files for personal computers, and the like.

  In general, MPEG is used for compression of image signals and audio signals. Among them, in order to efficiently perform compression, VBR (variable bit rate) and one-pass and two-pass technologies have been developed. Have been. For example, in the two-pass technique, a signal to be recorded is temporarily stored in an HDD or the like when a DVD video disc is created, and the signal is recompressed and re-recorded in a non-real-time state over a certain period of time to re-record the data. Is produced, but there is no method for realizing this in real time with a device such as a video movie, and it has been a problem that compression cannot be performed efficiently during the time actually recorded by the user. As a related patent, there is a technique disclosed in Japanese Patent Application Laid-Open No. 10-98710. Although this is a content related to the above-mentioned technology, a technology for realizing this in real time is not disclosed.

  The technique disclosed in this publication only discloses that two-pass control is performed using another large-scale storage device such as an HDD. Does not disclose a technique for realizing the format using one storage medium.

  The present invention has been devised in view of the above problems and effectively solving them. It is an object of the present invention to provide an optical information recording / reproducing apparatus that can perform two-pass control in substantially real time with one storage system when recording on an optical recording medium. Another object of the present invention is to provide a recording apparatus, a recording method, an optical information recording / reproducing apparatus, which can perform two-pass control while a user does not notice in one storage system, for example, during idle time such as at night. An object of the present invention is to provide an optical recording method.

In order to solve the above-described problems, the present invention provides a recording apparatus, a recording method, an optical information recording / reproducing apparatus, and an optical recording method having the following configurations.
(1) compression means for compressing an input signal such as audio or video at a first compression rate in predetermined block units;
A difficulty extracting means for extracting the difficulty of the data at the time of compression;
Difficulty level storage means for storing the difficulty level;
Manually throwing the first compressed data in temporary storage means;
Means for managing the area of the second storage means;
Means for writing data stored at a stage when the data stored in the temporary storage means has reached a predetermined amount in a predetermined area of the second storage means,
During the storage in the temporary storage means, the compressed data stored in the second storage means is read out, and the compressed data is stored in the second storage means in accordance with the difficulty value stored in the difficulty storage means. Second compression means for recompressing at the same or higher compression rate than one compression rate,
A recording apparatus for recording data compressed by said second compression means in a storage area of said second storage means.
(2) compression means for compressing an input signal such as audio or video at a first compression rate in predetermined block units;
Code amount extracting means for extracting the code amount of data at the time of compression;
Code amount storage means for storing the code amount;
Means for sequentially storing the compressed first data in the temporary storage means,
Means for managing the area of the second storage means;
Means for writing data stored at a stage when the data stored in the temporary storage means has reached a predetermined amount in a predetermined area of the second storage means,
During the storage in the temporary storage means, the compressed data stored in the second storage means is read out, and the compressed data is stored in the first storage means in accordance with the code amount stored in the code amount storage means. Second compression means for recompressing again at the same or higher compression rate than the compression rate of
A recording apparatus for recording data compressed by said second compression means in a storage area of said second storage means.
(3) An optical information recording / reproducing apparatus for recording / reproducing a digital signal on an optically recordable optical information recording medium,
A laser generating means for optically recording and reproducing information from a track;
Pickup means for detecting the reflected light by a plurality of divided sensors,
Means for calculating each signal to obtain a reproduction signal and a servo error signal;
Focus control means for focusing on the signal surface;
Tracking control means for tracking the track;
Compression means for compressing the recording signal at a first compression rate in predetermined block units;
A difficulty extracting means for extracting the difficulty of the data at the time of compression;
Difficulty level storage means for storing the difficulty level;
Temporary storage means for temporarily storing the compressed recording signal;
Data remaining amount management means for managing the amount of data stored in the temporary storage means,
Recording means for controlling the compressed recording signal to be recorded on the optical information recording medium,
Area management means for managing an area recorded on the optical information recording medium,
During the step of storing the compressed data in the temporary storage unit, the compressed data stored in the optical information recording medium is read out, and the compressed data is stored in the first storage unit in accordance with the difficulty value stored in the difficulty storage unit. Second compression means for recompressing again at the same or higher compression rate than the compression rate of
An optical information recording / reproducing apparatus which records data compressed by the second compression means so that predetermined block units are continuously connected by the area management means on the optical information recording medium.
(4) An optical information recording / reproducing apparatus for recording / reproducing a digital signal on / from an optically recordable optical information recording medium,
A laser generator for optically recording and reproducing information from the track;
Pickup means for detecting the reflected light by a plurality of divided sensors,
Means for calculating each signal to obtain a reproduction signal and a servo error signal;
Focus control means for focusing on the signal surface;
A tracking control hand throw for tracking the track;
Compression means for compressing the recording signal at a first compression rate in predetermined block units;
Code amount extracting means for extracting the code amount of data at the time of compression;
Code amount storage means for storing the code amount;
Temporary storage means for temporarily storing the compressed recording signal;
Data remaining amount management means for managing the amount of data stored in the temporary storage
A recording method for controlling a compressed recording signal to be recorded on the optical information recording medium;
Area management means for managing an area recorded on the optical information recording medium,
During the step of storing the compressed data in the temporary storage unit, the compressed data stored in the optical information recording medium is read out, and the compressed data is stored in the code amount storage unit according to the first amount. Having a second compression means for recompressing at the same or higher compression rate than the compression rate,
An optical information recording / reproducing apparatus which records data compressed by the second compression means so that predetermined block units are continuously connected by the area management means on the optical information recording medium.
(5) compression means for compressing an input signal such as audio or video at a first compression rate in a predetermined block unit, means for sequentially storing the compressed first data in temporary storage means, A first system comprising means for writing data stored in the second storage means when the data stored in the memory has reached a predetermined amount,
Compression means for compressing an input signal such as audio or video at a first compression rate in predetermined block units, difficulty extraction means for extracting the difficulty of data at the time of compression, and difficulty storage for storing the difficulty Means, means for sequentially storing the compressed first data in the temporary storage means, and writing of the stored data to the second storage means when the amount of data stored in the temporary storage means reaches a predetermined amount. Means for reading compressed data stored in the second storage means during the step of storing the compressed data in the temporary storage means, and storing the compressed data in accordance with the difficulty value stored in the difficulty storage means. A second compression means for recompressing the data at the same or higher compression rate than the first compression rate, and storing the data compressed by the second compression means in the second storage means. System and ,
A recording apparatus which selects one of the systems according to the properties of an input signal such as audio or video or the setting of a compression mode.
(6) compression means for compressing an input signal such as audio or video at a first compression rate in predetermined block units; means for sequentially storing the compressed first data in temporary storage means; A first system including means for writing stored data to the second storage means when the stored data has reached a predetermined amount,
Compression means for compressing an input signal such as audio or video at a first compression rate in predetermined block units, code amount extraction means for extracting the code amount of data at the time of compression, and a code amount for storing the code amount Storage means, means for sequentially storing the compressed first data in the temporary storage means, and data stored when the data stored in the temporary storage hand throw reaches a predetermined amount in the second storage means. Writing means, and reading the compressed data stored in the second storage means during the storage in the first storage means, and in accordance with the code amount stored in the code amount storage means, A second compression unit for compressing the compressed data again at the same or higher compression rate than the first compression rate, and storing the data compressed by the second compression unit in the second storage unit. With two systems ,
A recording apparatus which selects one of the systems according to the properties of an input signal such as audio or video or the setting of a compression mode.
(7) An optical information recording / reproducing apparatus for recording / reproducing a digital signal on an optically recordable optical information recording medium,
A laser generating means for optically recording and reproducing information from a track, a pickup means for detecting reflected light by a plurality of divided sensors, and a means for calculating respective signals to obtain a reproduced signal and a servo error signal. Throwing, focus control means for focusing on the signal surface, tracking control manual throwing for tracking the track, compression means for compressing the recording signal in a predetermined block unit at a first compression rate, and temporarily storing the compressed recording signal. A temporary storage unit for storing; a data remaining amount management unit for managing an amount of data stored in the temporary storage unit; and a recording unit for controlling to record a compressed recording signal on the optical information recording medium. A first system with
Compression means for compressing the recording signal at a first compression rate in predetermined block units; difficulty extraction means for extracting the difficulty level of the data at the time of compression; difficulty storage means for storing the difficulty level; A temporary storage unit for temporarily storing a recording signal, a data remaining amount managing unit for managing an amount of data stored in the temporary storage unit, and controlling to record a compressed recording signal on the optical information recording medium. Recording means for reading out the compressed data stored in the optical information recording medium during the storing in the temporary storage means, and in accordance with the difficulty value stored in the difficulty storage means, A second compression means for compressing the data again at the same or higher compression rate than the first compression rate, wherein a predetermined block unit of the data compressed by the second compression means is the optical information. And a second system for recording so as to be connected continuously on the recording medium,
An optical information recording / reproducing apparatus characterized in that one of the systems is selected according to the properties of an input signal such as audio or video, the setting of a compression mode, or the state of the optical information recording medium.
(8) An optical information recording and reproducing apparatus for recording and reproducing digital signals on an optically recordable optical information recording medium,
A laser generating means for optically recording and reproducing information from a track, a pick-up method for detecting a reflected light by a plurality of divided sensors, and a means for calculating respective signals to obtain a reproduced signal and a servo error signal. Focus control means for focusing on the signal surface; tracking control means for tracking the track; compression means for compressing the recording signal at a first compression rate in predetermined block units; and temporarily storing the compressed recording signal. A temporary storage unit, a data remaining amount management unit that manages an amount of data stored in the temporary storage unit, and a recording unit that controls recording of a compressed recording signal on the optical information recording medium. One system,
Compression means for compressing the recording signal at a first compression rate in predetermined block units; code amount extraction means for extracting the code amount of data at the time of compression; code amount storage means for storing the code amount; Temporary storage means for temporarily storing the compressed recording signal, data remaining amount management means for managing the amount of data stored in the temporary storage means, and control to record the compressed recording signal on the optical information recording medium. Recording means for reading out the compressed data stored in the optical information recording medium during the step of storing the compressed data in the temporary storage means, and storing the compressed data in accordance with the code amount stored in the code amount storage means. A second compression means for recompressing at the same or higher compression rate than the first compression rate, wherein the data compressed here is converted into a predetermined block unit on the optical information recording medium. As lead to-sustaining, and a second system for storing,
An optical information recording / reproducing apparatus characterized in that one of the systems is selected according to the properties of an input signal such as audio or video, the setting of a compression mode, or the state of the optical information recording medium.
(9) a compression step of compressing an input signal such as audio or video at a first compression rate in predetermined block units;
A difficulty extraction step of extracting the difficulty of the data at the time of compression;
A difficulty storage step for storing the difficulty;
Sequentially storing the compressed first data in temporary storage means;
Writing the stored data to the second storage means when the data stored in the temporary storage means has reached a predetermined amount, and storing the data in the temporary storage means, Reading compressed data stored in the second storage means;
A second compression step of compressing the compressed data again at the same or higher compression rate than the first compression rate, according to the difficulty value stored in the difficulty storage step;
Storing the data compressed in the second compression step in the second storage means;
A recording method characterized by comprising:
(10) a compression step of compressing an input signal such as audio or video at a first compression rate in predetermined block units;
A code amount extracting step of extracting a code amount of data at the time of compression;
A code amount storing step of storing the code amount;
Sequentially storing the compressed first data in temporary storage means;
Writing the data stored in the temporary storage means when the data stored in the temporary storage means reaches a predetermined amount, and storing the data in the temporary storage means, Reading compressed data stored in the second storage means;
A second compression step of compressing the compressed data again at the same or higher compression rate than the first compression rate, according to the code amount stored in the code amount storage step;
Storing the data compressed in the second compression step in the second storage means;
A recording method characterized by comprising:
(11) An optical recording method for recording a digital signal on an optically recordable optical information recording medium,
A focus control step of focusing the pickup on the signal surface;
A tracking control step of tracking the pickup to a truck;
A compression step of compressing the recording signal at a first compression rate in predetermined block units;
A difficulty extraction step of extracting the difficulty of the data at the time of compression;
A difficulty storage step for storing the difficulty;
A temporary storage step of temporarily storing the compressed recording signal;
A data remaining amount management step of managing the data amount stored in the temporary storage means,
Moving the pickup to a first area of the optical recording medium;
A recording step of controlling to record the compressed recording signal in the first area of the optical recording medium;
Moving the pickup to the first area of the optical recording medium during the storing in the temporary storage means;
Reading compressed data stored in the optical recording medium;
A second compression step of compressing the compressed data again at the same or higher compression rate than the first compression rate, according to the difficulty value stored in the difficulty storage step;
Moving the pickup to a second area of the optical recording medium, such that the data compressed in the second compression step is such that a predetermined block unit is continuously connected on the optical recording medium;
Storing the data moved to the second area.
(12) An optical recording method for recording a digital signal on an optically recordable optical information recording medium,
A focus control step of focusing the pickup on the signal surface;
A tracking control step of tracking the pickup to a truck;
A compression step of compressing the recording signal at a first compression rate in predetermined block units;
A code amount extracting step of extracting a code amount of data at the time of compression;
A code amount storing step of storing the code amount;
A temporary storage step of recording the compressed recording signal in temporary storage means,
A data remaining amount management step of managing the data amount stored in the temporary storage means,
Moving the pickup to a first area of the optical recording medium;
A recording step of controlling to record the compressed recording signal in the first area of the optical recording medium;
Moving the pickup to the first area of the optical recording medium during the storing in the temporary storage means;
Reading compressed data stored in the optical recording medium;
A second compression step of compressing the compressed data again at the same or higher compression rate than the first compression rate, according to the code amount stored in the code amount storage step;
Moving the pickup to a second area of the optical recording medium, such that the data compressed in the second compression step is such that a predetermined block unit is continuously connected on the optical recording medium;
Storing the data moved to the second area.

  According to the present invention, at the time of recording the first pass data in the first temporary storage means at the time of recording on the optical information recording medium, it is a period during which the temporary recording of the optical recording medium is not performed. Since the data of the second pass is recompressed in the idle time, two-pass control can be performed in one storage system in substantially real time, and the compression efficiency can be optimized. In addition, during recording on the optical recording medium, the data of the first pass is stored at a transfer rate higher than a predetermined recording transfer rate (lower compression rate), and the data of the second pass is reproduced during an idle time when recording and reproduction are not performed. Since the compression processing is performed, two-pass control can be performed with one storage system without the user's knowledge, and the compression efficiency can be optimized.

  Hereinafter, an embodiment of an optical information recording / reproducing apparatus according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing a first embodiment of the optical information recording / reproducing apparatus of the present invention, and FIG. 2 is an explanatory diagram for explaining the concept of a sector in an optical recording medium (optical disk). First, the configuration of an optical disk 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 TR1 and TR2 at positions with different radii are shown. Here, since the rotation of the optical disc D is controlled at a constant linear velocity (CLV), one round of the inner track A is divided into, for example, four sectors, and one round of the outer track B is set, for example. It is divided into eight sectors. The rotation cycle is about 40 msec when the pickup means described later is located on the inner track TR1 and about 80 msec when it is located on the outer track TR2. As described above, a large number of tracks exist between the tracks TR1 and TR2 or on the inner and outer circumferences thereof.

  Next, the recording / reproducing apparatus will be described with reference to FIG. In the figure, reference numeral 2 denotes a spindle motor for rotating the optical disc 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 reflected light of the laser beam applied to the optical disc D. The optical pickup unit 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. Reference numeral 5 denotes a write-dry unit, which sends a signal to be recorded to the optical pickup unit 3 during recording. Reference numeral 6 denotes a servo block unit, which includes a focus control function, a tracking control function, a spindle control function, and the like. Reference numeral 7 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 8 denotes a signal processing unit, which includes an encoder 8A and a decoder 8A. Here, the decoder 8A decodes, for example, a reproduced signal from EFM (Eight to Fourteen Modulation) + signal to NRZI data, performs error correction processing of the decoded reproduced signal, and obtains a sector address signal and a data signal. This signal is a signal compressed at a variable transfer rate. Reference numeral 9 denotes a temporary storage unit having, for example, a DRAM and having a storage capacity of about 256 MB. Here, the internal storage is divided into a first temporary storage unit (unit) 9A and a second temporary storage unit (unit) 9B. Use by dividing into two areas. The first temporary storage unit 9A temporarily stores an input signal to be recorded in a state where the input signal is compressed at a first compression rate. The second temporary storage section 9B temporarily stores the signal read from the optical disc D, thereby absorbing the time axis of the variable transfer bit rate. Reference numeral 10 denotes, for example, an A (audio) -V (video) encoder / decoder unit, which includes an AV encoder 10A and an AV decoder 10B. The AV decoder 10B has a decoding function (at the time of reproduction) for expanding the compressed data, and the AV encoder 10A has an encoding function (at the time of recording) for compressing the input signal. The AV encoder 10A has a temporary storage unit 11 made of, for example, a 64 MB DRAM used for encoding, and the AV decoder 10B has a temporary storage unit 12 made of, for example, a 16 MB DRAM used for decoding.

  A speaker that outputs an audio signal and a display that outputs a video signal are connected to the AV encoder 10A, and a microphone that inputs an audio signal, a CCD camera that inputs a video signal, and the like are connected to the AV decoder 10B. Reference numeral 11 denotes a storage amount monitoring unit that monitors the amount of data stored in the first temporary storage unit 9A. Reference numeral 12 denotes a difficulty level that extracts and stores the difficulty level of the data when the input signal is compressed. Extraction means (extraction storage means).

  Here, the difficulty level is image property information, and one of the image property information in the difficulty level is, for example, the variance of the input image. In moving image compression by MPEG, compression is performed by combining two-dimensional DCT transform and Huffman coding, so that compression efficiency is deteriorated in an image containing many components having a high spatial frequency. In such an image, the variance of the image amplitude is large. Even in a moving image including such a section, in order to maintain uniform image quality throughout the entire moving image, an image with a large variance is compressed so as to have a larger code amount, and an image with a small variance has a smaller code amount. It is necessary to control so that compression is performed. For this purpose, first, the variance of each frame is calculated throughout the moving image and their average value is calculated. A frame having a variance needs to be assigned a code amount smaller than the average code amount.

  As the second property information of the image property information, there is a correlation between frames. In moving image compression by MPEG, a reference region having a similar luminance distribution between adjacent frames is searched, and a spatial azimuth (motion vector) of the reference region and a luminance difference (prediction difference) between the reference region and the reference region are calculated. The compression efficiency is increased by efficiently compressing the motion vector and the prediction difference. When the inter-frame correlation is high, the prediction difference hardly occurs, so that it is possible to compress to a smaller code amount. When the prediction difference is large, a larger code amount is generated. By performing code amount control that reflects the prediction difference amount, it is possible to obtain compressed information that maintains uniform image quality.

  As the third property information of the image property information, there is a method of compressing the primary bit stream so that the image quality is constant, and using the code amount as an index. In image compression by MPEG, a DCT coefficient obtained as a result of DCT conversion is divided by a numerical value called a quantization coefficient, a fractional part is truncated, converted to a smaller value, and compressed. Although the distortion due to compression increases as the quantization coefficient increases, compression can be performed at a higher compression rate. By performing compression while keeping the quantization coefficient constant, it is possible to perform compression while maintaining image quality uniform. In this case, the amount of the bit stream obtained as a result of the compression depends on the properties of the input image, and an image containing many components with a high spatial frequency or an image with a small inter-frame correlation is compressed to a large bit stream amount. From the code amount of each frame required for the primary compression and the total code amount, the code amount to be assigned to each frame to fit the total code amount to the target amount is calculated. When the secondary bit stream is generated, The code amount is controlled so as to have this value. Reference numeral 13 denotes a key unit for inputting a command such as a recording mode with a key or the like. Reference numeral 14 denotes a system control unit (control means) including, 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. The system control unit 14 determines a reproduction start or recording start command input by the key unit 13 or the like, and controls the signal processing unit 8 and the servo block unit 6 according to the command. The signal of the optical disk D read by the optical pickup unit 3 is input to a preamplifier unit 4, where a reproduced signal and a servo signal are generated. The generated servo signal is input to the servo block unit 6, 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 7, 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 the servo block unit 6 to generate a drive control signal via the driver unit 7. CLV control is performed by controlling the rotation of the spindle motor 2 by the drive control signal. Also, a rotation position signal of a not-shown hall element of the spindle motor 2 is fed back to the servo block section 6, and a FG (Frequency Generator) control of a constant rotation is also performed from a speed signal generated from this signal. The reproduced signal is frequency-optimized by an equalizer of the preamplifier unit 4, is PLL-locked by a PLL (Phase Locked Loop) circuit, and has a jitter value generated from a comparison between the time axis of the bit clock of the PLL and the time axis of the data. And performs waveform correction during recording according to the jitter value.

  The reproduced signal output from the preamplifier unit 4 is converted into a digital signal by the decoder 8B of the signal processing unit 8, and synchronization detection is performed from this digital signal. Decoded to NRZI data. The decoded signal is subjected to error correction processing 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 9 (second temporary storage section 9B) to absorb the time axis of the variable transfer rate. Perform The signal read from the temporary storage means 9 (9B) is expanded by the AV decoder 10B of the encoder / decoder 10 and further separated into an audio signal and a video signal. At this time, the expansion speed is determined according to various recording modes based on the control data recorded on the optical disk D, and the expansion operation is performed in accordance with the speed. 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.

  Next, a recording operation which is a feature of the present invention will be described. FIG. 3 is a conceptual diagram showing the state of control of the first temporary storage section 9A of the temporary storage means 9 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 for the AV encoder 10A of the encoder / decoder section 10 by setting the key section 13 and the like. For example, as a recording mode, when compressing an image signal input at 10 Mbps as an input signal of an original image, a high-quality transfer rate of 8 Mbps, a 2-hour recording time of 2 hours, and a slightly higher-quality transfer rate of 4 Mbps There are a 4-hour mode with a recording time of 4 hours and an 8-hour mode with a recording time of 8 hours at a normal image quality transfer rate of 2 Mbps, and the mode can be selected.

  When writing to the optical disc D, the rotation speed of the optical disc D is set to the maximum transfer rate of the input signal at the time of recording, for example, a transfer rate higher than 8 Mbps, for example, 10 Mbps. Is fixed at the high transfer rate. In addition, the system control unit 14 recognizes key input and 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. A terminal is provided so that the recording time can be changed, and the user inputs from the key unit 13 or the like. Here, the change of the recording time is performed at one pass VBR (variable bit rate), but may be performed at CBR (constant bit rate). With VBR, the compression ratio can be increased and the transfer rate can be reduced, but there is a problem that the recording time cannot be made constant because of one pass. Conversely, with CBR, the transfer rate cannot be reduced too much. Another advantage is that time can be kept constant. Among them, it is particularly preferable to use CBR when the transfer rate is high (8 Mbps or the like) and to use VBR when the transfer rate is low (2 Mbps or the like).

  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, or the like is used, but is not particularly limited thereto. In the recording mode, the AV encoder 10A of the encoder / decoder 10 has a configuration that can be set for each transfer rate, and the user sets this transfer rate. The input signal (audio signal and video signal) to be recorded input from the recording signal source is coded into, for example, MPEG by the AV encoder 10A of the encoder / decoder unit 10 using the temporary storage unit 25 of 64 MB and compressed. The full (first recording reference value) and the empty (second recording reference value) of the first temporary storage unit 9A are set according to the transfer rate corresponding to the compression, and the encoder 8A of the signal processing unit 8 is further set. , An error correction code, an address code, a sync signal and the like are added and temporarily recorded in the first temporary storage section 9A (area a). This data is referred to as data X1. The storage data amount is constantly monitored by the storage amount monitoring means 11. When the storage data amount becomes full, data is sequentially read from the first temporary storage unit 9A and the data is read out via the write drive unit 5. The data is temporarily written on the optical disk D by the pickup unit 3 (area b). During the reading from the first temporary storage unit 9A, the input signal from the recording signal source side is compressed and continuously written to the first temporary storage unit 9A. Is also faster in reading speed.

  When the amount of data stored in the first temporary storage section 9A becomes empty, reading from the first temporary storage section 9A and writing to the optical disk D are prohibited, and the optical pickup is moved to the next sector position to be recorded. The part 3 is positioned and the kick is repeated here to wait. During this time, the writing of the compressed data to the first temporary storage unit 9A is continuously performed (area c), and this data is referred to as data X2. Then, when the storage data amount becomes full, reading of data from the first temporary storage unit 9A is restarted, and temporary writing to the optical disk D is performed until the storage data amount becomes empty ( d region). Thereafter, the temporary data write to the optical disc D is performed intermittently while repeating the full and empty storage data amounts in the first temporary storage section 9A. In the area e, data X3 is stored.

  FIG. 3A shows a case where the transfer rate of the input signal is 2 Mbps, the writing speed to the first temporary storage unit 9A in the area a is 2 Mbps, and the temporary writing to the optical disc D in the area b. Since the write speed (transfer rate) is 10 Mbps, data is read from the first temporary storage unit 9A at a speed (transfer rate) of 10-2 = 8 Mbps. FIG. 3B shows a case where the transfer rate of the input signal is 4 Mbps. The write speed to the first temporary storage unit 9A in the area a is written at 4 Mbps, and the temporary write rate to the optical disc D is written in the area b. Since the writing speed (transfer rate) is 10 Mbps, data is read from the first temporary storage unit 9A at a speed (transfer rate) of 10-4 = 6 Mbps. FIG. 3C shows a case where the transfer rate of the input signal is 8 Mbps. The write speed to the first temporary storage unit 9A in the area a is 8 Mbps, and the temporary write rate to the optical disc D is in the area b. Since the writing speed (transfer rate) is 10 Mbps, the data is read from the first temporary storage unit 9A at a speed (transfer rate) of 10−8 = 2 Mbps.

  In the above three cases, the transfer rate of the input signal to the temporary storage unit 9A is set to be 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 D. The input signal can be continuously recorded in the temporary storage unit 9A during the standby state until the writing of the areas c and e to the optical disc D is started. The above is the description of the one-pass variable transfer rate (VBR). That is, since the average transfer rate is controlled so as to be 2 Mbps regardless of the nature of the signal of the input signal, for example, a video of a sport with a lot of motion or a video with a lot of scene changes causes a breakdown or Nevertheless, if a large bit rate is assigned to a scene with a lot of motion by VBR, the overall transfer rate will eventually increase, requiring a large capacity as a recording area, and making it impossible to efficiently manage the recording time of the entire optical disc. Also occurs. This is particularly likely to occur when a high compression ratio is set for an input signal. For example, when the transfer rate is set to 8 Mbps in the above example (moving sports video or video with many scene changes), the compression rate is small, so that the video signal rarely breaks down. Depending on the image quality, even one-pass VBR printing can be sufficiently satisfied, and in some cases, CBR (constant bit rate) may be used instead of VBR. On the other hand, when it is set to 2 Mbps, the compression ratio is large, so that compression is particularly difficult, and the possibility of failure increases.

  Therefore, in the present embodiment, two-path control, which is a feature of the present invention, is performed to prevent the above failure. As described above, at 2 Mbps, the problem of the breakdown of the video signal in the one-pass VBR is greater. Therefore, as can be understood from the description of the control of the first temporary storage unit 9 </ b> A, the first data is recorded during the recording. Since there is a vacant time during which data is recorded in the temporary storage unit 9A and not recorded on the optical disc D, for example, periods a, c, and e in FIG. 3, two-path control is performed using this period. do. In the two-pass control, data temporarily recorded on the optical disk D is read in the state shown in FIG. 3, the read signal is recompressed, and the data is written on the optical disk D again. FIG. 4 is a graph showing a change in the amount of data stored in the first temporary storage unit 9A and the second temporary storage unit 9B. FIG. 5 is a diagram schematically showing recording tracks on the optical disk D. FIG. 4 is a diagram schematically showing an arrangement of recording data on an optical disc. Here, FIG. 4A shows a change in the data storage amount of the first temporary storage unit 9A corresponding to each graph of FIGS. 3A, 3B, and 3C. B) shows a change in the data storage amount of the second temporary storage unit 9B. Note that in FIG. 4A, the timing and the like are shown as an example of FIG. 3A. 5 (A) and 6 (A) show the recording scanning state on the track of the optical disk in the first pass (temporary writing), and FIGS. 5 (B), (C) and FIG. This shows the recording state on the track of the optical disk during the pass (final writing).

  First, when the system control unit 14 sets, for example, a 2 Mbps mode in the multiple recording mode based on input data from the key unit 13 or the like, this mode is set in the AV encoder 10A. In this state, when a video signal or the like (input signal) to be recorded is input to the AV encoder 10A, the AV encoder 10A performs the MPEG2 compression process on the one video signal. The means 12 analyzes the image information property of the video signal to determine the degree of difficulty. Here, an example of a method of analyzing the image information property is also disclosed in the above-mentioned Japanese Patent Application Laid-Open No. Hei 10-98710. A search is performed for a reference region having a similar luminance distribution, a spatial azimuth (motion vector) of the reference region and a luminance difference (prediction difference) between the reference region and the reference region are calculated, and the motion vector and the prediction difference are highly efficiently compressed. There is something that I did. Then, on the quantization scale corresponding to the transfer rate of 8 Mbps, which is larger than the above 2 Mbps, the compressed data of one GOP (group of picture) unit in the MPEG system is temporarily converted into 64 MB temporary data. It is generated using the storage unit 25. The image information property of the compressed data is stored in, for example, the AV encoder 10A. Here, for example, as shown in the above-mentioned Japanese Patent Application Laid-Open No. 10-98710, compressed data (consisting of I-picture, P-picture, and B-picture frames) forming one GOP is generated based on MPEG. I do. The AV encoder 10A transfers the compressed data to the second temporary storage unit 9B via the encoder 8A of the signal processing unit 8 in units of 1 GOP or more (hereinafter, referred to as one block).

  In this setting, two-pass control is performed at a transfer rate of 2 Mbps. However, one-pass and two-pass control can be appropriately performed by an empty area of the optical disk D, user setting, automatic detection, and the like. You may change it. The two-pass control will be described with reference to FIG. The encoder 8A of the signal processing unit 8 temporarily stores the data compressed by the AV encoder 10A in the second temporary storage unit 9B. Then, in order to record (temporarily write) the compressed data stored here on the optical disk D, the data is converted into an EFM + format, an error correction code is added, and a sync is added. To record. This is as described above. In the first temporary storage section 9A, data X1 is recorded from timing T1 (empty) to T2 (full), and at a timing from T2 (full) to T3 (empty), a predetermined track at point A of the optical disc D is recorded. The data X1 read from the first temporary storage unit 9A is temporarily written from the predetermined sector to the point B. Next, until the data X2 is accumulated in the first temporary storage unit 9A (from T3 to T4), the optical pickup unit 3 waits in the kick state at the next recording point B, and repeats the kick operation. When the data X2 accumulates in the first temporary storage unit 9A (when it becomes T4 (full)), the data X2 is temporarily written from the point B to the point C of the optical disc D from timing T4 to T5 (empty), and When the data X3 similarly accumulates at T10, the data X3 is temporarily written from the point C to the point D of the optical disc D from timing T10 to T11. Hereinafter, the same operation is performed. Therefore, as shown in FIG. 5A, data is temporarily recorded at points A, B, C, and D on a spiral track.

  Here, as described above, the result of analyzing the degree of difficulty of compression from the image information properties corresponding to the compressed data X1 to X3 in each block unit is calculated as the number of blocks obtained by adding the result of each block and the average value. I do. Then, when the value of the result reaches the predetermined block amount, the temporary storage operation of the second temporary storage unit 9B is started. In FIG. 4B, the control of the second temporary storage unit 9B is performed from time T5 when the temporary recording of the data X2 on the optical disc D is completed. At this time, the optical pickup unit 3 is in a state where the head kick is repeated on the track at the point C, and assuming that a predetermined block value has been reached (actually, the temporary writing time uses a long time). From the difficulty at the time, a quantization scale for setting the transfer rate to be originally recorded at 2 Mbps is determined. Based on this value, the optical pickup unit 3 is moved from the point C to the point A at the timing T6 to reproduce the data X1 temporarily recorded on the optical disc D at 8 Mbps simply (temporarily) as described above. Moving. Then, the signal is reproduced and read from the sector at the point A to the sector at the point B (timing T7), and the read signal is temporarily recorded in the second temporary storage unit 9B via the preamplifier unit 4 and the decoder 8B. Since this read signal data is 8 Mbps data, it is recompressed in the following three ways to convert it again to 2 Mbps.

<First Method> For example, on the path indicated by [circle 1] in FIG. 1, as described above, the 8 Mbps data X1 stored in the second temporary storage unit 9B is transferred to the decoder 8B and the AV encoder 10A. In the AV encoder 10A, the quantization scale is rewritten and recompressed.
<Second Method> In the path indicated by [circle 2] in FIG. 1, the data X1 is transferred to the AV decoder 10B, and only a part of the data X1 is decoded by the AV decoder 10B. Is transferred to the AV encoder 10A, where the quantization scale is rewritten and recompressed.
<Third Method> In the path indicated by [circle 3] in FIG. 1, the data X1 is transferred to the AV decoder 10B, and the decoder 10B decodes all the data X1, and converts the data to the AV encoder 10A. And the AV encoder 10A rewrites and recompresses the quantization scale.
As a result, the data X1 compressed to 2 Mbps could be stored in the second temporary storage unit 9B by the encoder 8A. During this time, the optical pickup unit 3 was moved to the point A to be recorded next. Overwrite recording, that is, actual writing is performed on the recorded 8 Mbps data. Here, since the data X1 is converted into 2 Mbps data, the end position is shifted from the point B to the point B 'as in a spiral (see FIG. 5B). Next, when the first temporary storage unit 9A reaches a predetermined amount (full) (timing T10), the optical pickup unit 3 moves to the point C and temporarily writes the data X3 on the optical disk D. Hereinafter, by repeating this operation, recording of the two-pass VBR can be performed.

  In the second case of the second temporary storage unit 9B, the data X2 from the point B to the point C on the disk is recorded while the position is sequentially changed, such as the main recording from the point B 'to the point C'. Therefore, it is necessary to simultaneously manage the current recording address and the address for two passes. As described above, when the optical disc is used for the first time, the data is continuously managed from the address A, for example, while managing the two addresses regardless of whether the address is 0 or an intermediate address. By intermittently performing recording while performing linking, and preferably by superimposing and recording the data of the first pass and the second pass, the data area of the optical disc can be effectively recorded, and In addition, the movement time between tracks is short, and efficient two-pass printing can be performed.

  At this time, the recording state on the track of the optical disc is recompressed and recorded when one-pass data a, b, c... Are two-pass data as shown in FIGS. 6A and 6B. In summary, the data X1 is read from the optical disc D1 between the timings T6 and T7, the read signal is recompressed between the timings T7 and T8, and the data is temporarily stored in the second temporary storage unit 9B. The data X1 is read from the second temporary storage unit 9B between the timings T8 and T9, and is written on the optical disk D. It should be noted that the above series of processing is performed between timings T5 and T10. Similarly, the data X2 is read from the optical disc D1 between the timings T12 and T13, the read signal is recompressed between the timings T13 and T14, and the data is temporarily stored in the second temporary storage unit 9B. Further, the data X2 is read out from the second temporary storage unit 9B between the timings T14 and T15 and is written on the optical disk D. At this time, the recompressed data recorded on the optical disc D is recorded so as to be continuous. Also, note that this series of processing is performed between timings T11 and T16. Hereinafter, similar processing is repeatedly performed.

  Note that, between the timings T7 and T8 and between T13 and T14, the case where data is transferred from the second temporary storage unit 9B and the case where recompressed data are stored intersect. , And the amount of stored data is mixed. In this case, the compression process may be performed using the temporary storage units 11 and 12 of the encoder / decoder unit 10 to perform the division process. Here, the above-described series of operations will be generally described with reference to a flowchart shown in FIG. First, the external signal is compressed at the first compression rate, and the compressed data is stored in the first temporary storage unit 9A (S1). At the time of this compression, the difficulty level extraction unit 12 integrates the property data of the recording block. Then, the degree of difficulty of compression is obtained (S2).

  Then, the recording blocks at this time are integrated (S3). If the integrated value is not the predetermined amount, the process proceeds to S7 to determine whether the first temporary storage unit 9A is full (S7). ). When it is not full, the process returns to S1 and repeats S1 to S4. When the data is full in S7, the data in the first temporary storage unit 9A is temporarily recorded on the optical disc D (S8). Then, this temporary recording operation is performed until it becomes empty (S9). If there is data to be recorded, the process returns to S1. In S4, when the number of recording blocks reaches a predetermined amount, the recording head goes to a predetermined area of the optical disc, reads out data of the temporarily recorded destination, and stores it in the second temporary storage unit 9B (S2). Then, the data in the second temporary storage section 9B is recompressed at the second compression rate, and the recompressed data is recorded in the recompressed data area of the optical disc D so as to be continuous with the previous recompressed data ( S7). In this way, the series of operations of S1 to S10 are repeated, and if there is no more data to be recorded in S10, the process ends.

  In the first embodiment, the data of one block is re-compressed using the second temporary storage unit 9B while the data of one block is compressed and stored in the first temporary storage unit 9A. However, at this time, data of a plurality of blocks may be recompressed. FIG. 8 shows a change in the data storage amounts of the first temporary storage unit and the second temporary storage unit in this modification. For example, here, one data block, that is, data X4 is stored in the first temporary storage unit. While the data is being stored in the unit 9A, the two data blocks that have been temporarily written earlier, that is, the data X1 and X2 in the AB section and the BC section on the optical disc D are read out from the optical disc D1, The data is stored in the storage unit 9B, and each is recompressed and written to the optical disk D1. In FIG. 8, the portion of the temporary writing of the data X4 is shown enlarged in time.

  In this way, for example, when compressing data of one block, by compressing two blocks again, for example, when compressing 100 data, 50 data are temporarily recorded, and By determining the recompression rate at the stage of extracting the properties and starting recompression, an effect close to two-pass control can be obtained, and the compression and recompression can be performed almost simultaneously in the provisional recording time of the remaining 50 data. Since the processing is completed, two-pass control can be realized in real time. Here, when one block is compressed, two blocks are recompressed. However, if three or more blocks are used, the compression becomes closer to a two-pass technique and the compression efficiency can be increased. In addition, the use efficiency of the disk can be increased.

  In addition, the timing for performing recompression has been described in the case where the start time is a point at which predetermined data is accumulated. It is also possible to have a management means for managing the free area, and determine the starting point according to the free area of the disk. In other words, in the control with two passes, more data areas are required on the disc than the data area of the final two-pass main recording as the data area of the temporary recording of the first pass. If there is little space available, this problem can be solved by starting two-pass control earlier than the predetermined amount. In this method, since the data once compressed is recompressed, the time from the temporary compression to the end of the total recording may be slightly increased, but this can be minimized. In addition, the recording means of the first temporary storage unit 9A, the second temporary storage unit 9B, and the temporary storage unit 25 may be used by dividing one recording unit.

  Next, a second embodiment of the present invention will be described. In the first embodiment, when the input signal is stored in the first temporary storage section 9A, this storage content is stored in the optical pickup D by using the idle time of the optical pickup section which is not recorded on the optical disk D. Although the path control is performed, in the second embodiment, the two-path control is performed at a low transfer rate of, for example, 2 Mbps, using an idle time during which recording or reproduction is not performed, for example, a break time or a night time. Things. FIG. 9 is a block diagram showing a second embodiment of the apparatus of the present invention, FIG. 10 is a graph showing a change in the amount of data recorded in a first temporary storage unit and a second temporary storage unit, and FIG. It is a figure showing area data. As shown in FIG. 9, the apparatus of the second embodiment is different from the apparatus of the first embodiment shown in FIG. The configuration is exactly the same as that of the apparatus shown in FIG.

  In the first embodiment, as shown in FIG. 3, the operation of compressing the input signal and temporarily storing the compressed signal in the first temporary storage section 9A, and further reading and temporarily writing the read signal to the optical disk D is intermittent. Are performed in the same manner in the second embodiment, and the description thereof is omitted here. In the compression operation, the compression is performed at a first compression rate lower than the compression rate determined by the compression rate determining means 20. In addition to the operations described above, in the second embodiment, when data is compressed by the AV encoder 10A, the difficulty extraction means 12 analyzes and extracts the compression difficulty from the image information properties, and also records the data. Information is generated for the management area along with the above-mentioned difficulty level in association with the address and the data, and stored as shown in FIG. The management information finally recorded at 2 Mbps is also stored in the same manner.

  Here, the control operation of the second temporary storage unit 9B is performed at the stage when a series of temporary writing (temporary recording) to the optical disk D is completed and a command for the next recording / reproduction is not input for a predetermined time. It is started on condition that It is determined by the timer means 21 that this command is not input for a predetermined time. This processing can be set not only by time management by a timer, but also by, for example, judging the non-selection state of the apparatus by an external input or by setting an absolute time, for example, from 3:00 to 5:00 in the middle of the night. In the graph shown in FIG. 10, a timer start is set from time T5 when the temporary recording of the data X2 on the optical disk is completed, and when the timer means 21 determines that the recording / reproduction command has not been input within a predetermined time, The control operation of the second temporary storage unit 9B is performed. At this time, the optical pickup section 3 repeatedly stops the head kick on the track at the point C, and if the timer means 21 measures a predetermined time, the transfer rate to be originally recorded is 2 Mbps due to the difficulty at this time. To determine the quantization scale. Based on this value, the optical pickup unit 3 is moved from the point C to the point A at the timing T6 in order to reproduce the data X1 recorded at 8 Mbps simply (temporarily) as described above. Then, the signal is reproduced and read from the sector at the point A to the sector at the point B (timing T7), and the read signal is temporarily recorded in the second temporary storage section 9B. Since this read signal data is 8 Mbps data, it is recompressed in order to convert it again to 2 Mbps. The path of recompression at this time is performed in the same manner as described for the paths of [circle 1], [circle 2], and [circle 3] in FIG.

  As a result, the data X1 compressed to 2 Mbps can be stored in the second temporary storage unit 9B by the encoder 8A in the same manner as in the first embodiment, and during this time, the optical pickup unit 3 is next recorded. Move to the point A to be performed, and perform the overwriting recording, that is, the actual writing on the previously recorded data of 8 Mbps. Here, since the data X1 has been converted into 2 Mbps data, the end position has moved from point B to point B 'as in a spiral (see FIG. 10B). Next, at timing T12, the optical pickup unit 3 goes to the point B on the disk and reads the temporarily recorded data X2 to the point C. Then, the data is recompressed and recorded at the point B'-C 'between the timings T14 and T15. Hereinafter, by repeating this operation, recording of the two-pass VBR can be performed.

  In the second case of the second temporary storage unit 9B, the data X2 from the point B to the point C on the disk is recorded while the position is sequentially changed, such as the main recording from the point B 'to the point C'. Therefore, it is necessary to simultaneously manage the current recording address and the address for two passes. As described above, when the optical disc is used for the first time, the data is continuously managed from the address A, for example, while managing the two addresses regardless of whether the address is 0 or an intermediate address. The data area of the optical disk can be effectively recorded by intermittently recording, and preferably by overwriting and recording the data of the first pass and the second pass, and The moving time is short, and efficient two-pass printing can be performed.

  Here, the above-described series of operations will be generally described with reference to a flowchart shown in FIG. First, when an external signal to be recorded is input, it is compressed and temporarily stored in the first temporary storage section 9A (S21). At this time, the difficulty data is extracted by integrating the property data of the recording block. , The compression rate is determined (S22). Steps S21 and S22 are performed until the storage amount of the first temporary storage unit 9A becomes full (S23). When the storage amount becomes full, the data in the first temporary storage unit 9A is read out and temporarily recorded on the optical disk D. (Tentative writing) (S24). This temporary recording is performed until the first temporary storage unit 9A becomes empty (S25). If it becomes empty, it is determined whether or not the recording is completed (S26). If not, the process returns to S1.

  Here, if the recording is completed, the timer means 21 is started to start measuring time (S27), and it is determined whether or not a recording / reproducing command is input (S28). When the recording / reproducing command is input, the timer means 21 is reset (S29), and the process returns to S1. If a predetermined time has elapsed without a recording / reproducing command being input (S30), the data temporarily provisionally recorded is read from the optical disk D, and the read signal is temporarily stored in the second temporary storage unit 9B. (S31). Then, the read data is recompressed based on the difficulty level and temporarily stored in the second temporary storage unit 9B (S32). Further, the recompressed data is read out, written on the optical disc D, and recorded (S33). Then, the recompression process (S30-S33) is performed until all the temporarily recorded data is read (S34), and if all the temporarily recorded data is read, the process ends.

  In the second embodiment, the first temporary storage unit 9A and the second temporary storage unit 9B have been described as being separated for easy understanding of the invention. May be shared as the same memory. Further, in the first and second embodiments, the first and second temporary storage units 9A and 9B are described by dividing the temporary storage unit 9 composed of a 256 MB DRAM, but one DRAM or the like is divided into memories. The present invention is not limited to this case, and may be used in a mixed manner, or two or more memories may be allocated and shared. Further, the recording means of the first temporary storage means 9A, the second temporary storage means 9B and the temporary storage means 25 may be used by dividing one recording means. Although the above embodiment has been described as processing on one data surface, recording and reproduction of temporary data and main data may be performed using a plurality of signal surfaces of a multilayer disc.

FIG. 1 is a block diagram showing a first embodiment of the optical information recording / reproducing apparatus of the present invention. FIG. 3 is an explanatory diagram for explaining the concept of a sector in an optical recording medium (optical disc). FIG. 9 is a conceptual diagram showing a control state of a first temporary storage unit 9A of the temporary storage unit at the time of recording. 9 is a graph showing a change in the data storage amount of a first temporary storage unit and a second temporary storage unit. FIG. 3 is a diagram schematically showing recording tracks on an optical disc. FIG. 3 is a diagram schematically illustrating an arrangement of recording data on an optical disc. 5 is a flowchart showing the operation of the first embodiment of the device of the present invention. It is a figure which shows the change of the data storage amount of the 1st temporary storage part and the 2nd temporary storage part of the modification of 1st Example of this invention apparatus. FIG. 7 is a block diagram showing a second embodiment of the device of the present invention. 9 is a graph showing a change in a data recording amount of a first temporary storage unit and a second temporary storage unit. FIG. 3 is a diagram showing management area data on an optical disc. 6 is a flowchart showing the operation of the second embodiment of the device of the present invention.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 3 ... Optical pickup part, 4 ... Preamplifier part, 5 ... Write drive part, 6 ... Servo block part, 8 ... Signal processing part, 8A ... Encoder, 8B ... Decoder, 9 ... Temporary storage means, 9A ... First temporary storage Unit (first temporary storage unit), 9B ... second temporary storage unit (second temporary storage unit), 10 ... encoder / decoder unit, 10A ... AV encoder, 10B ... AV decoder, 11 ... storage amount monitoring unit , 12: difficulty extraction means (extraction storage means), 14: system control unit (control means), 20: compression rate determination means, 21: timer means, D: optical disk (optical information recording medium).

Claims (12)

Compression means for compressing an input signal such as audio or video at a first compression rate in predetermined block units;
A difficulty extracting means for extracting the difficulty of the data at the time of compression;
Difficulty level storage means for storing the difficulty level;
Manually throwing the first compressed data in temporary storage means;
Means for managing the area of the second storage means;
Means for writing data stored at a stage when the data stored in the temporary storage means has reached a predetermined amount in a predetermined area of the second storage means,
During the storage in the temporary storage means, the compressed data stored in the second storage means is read out, and the compressed data is stored in the second storage means in accordance with the difficulty value stored in the difficulty storage means. Second compression means for recompressing at the same or higher compression rate than one compression rate,
A recording apparatus for recording data compressed by said second compression means in a storage area of said second storage means. Compression means for compressing an input signal such as audio or video at a first compression rate in predetermined block units;
Code amount extracting means for extracting the code amount of data at the time of compression;
Code amount storage means for storing the code amount;
Means for sequentially storing the compressed first data in the temporary storage means,
Means for managing the area of the second storage means;
Means for writing data stored at a stage when the data stored in the temporary storage means has reached a predetermined amount in a predetermined area of the second storage means,
During the storage in the temporary storage means, the compressed data stored in the second storage means is read out, and the compressed data is stored in the first storage means in accordance with the code amount stored in the code amount storage means. Second compression means for recompressing again at the same or higher compression rate than the compression rate of
A recording apparatus for recording data compressed by said second compression means in a storage area of said second storage means. An optical information recording and reproducing apparatus for recording and reproducing digital signals on an optically recordable optical information recording medium,
A laser generating means for optically recording and reproducing information from a track;
Pickup means for detecting the reflected light by a plurality of divided sensors,
Means for calculating each signal to obtain a reproduction signal and a servo error signal;
Focus control means for focusing on the signal surface;
Tracking control means for tracking the track;
Compression means for compressing the recording signal at a first compression rate in predetermined block units;
A difficulty extracting means for extracting the difficulty of the data at the time of compression;
Difficulty level storage means for storing the difficulty level;
Temporary storage means for temporarily storing the compressed recording signal;
Data remaining amount management means for managing the amount of data stored in the temporary storage means,
Recording means for controlling the compressed recording signal to be recorded on the optical information recording medium,
Area management means for managing an area recorded on the optical information recording medium,
During the step of storing the compressed data in the temporary storage unit, the compressed data stored in the optical information recording medium is read out, and the compressed data is stored in the first storage unit in accordance with the difficulty value stored in the difficulty storage unit. Second compression means for recompressing again at the same or higher compression rate than the compression rate of
An optical information recording / reproducing apparatus which records data compressed by the second compression means so that predetermined block units are continuously connected by the area management means on the optical information recording medium. An optical information recording and reproducing apparatus for recording and reproducing digital signals on an optically recordable optical information recording medium,
A laser generator for optically recording and reproducing information from the track;
Pickup means for detecting the reflected light by a plurality of divided sensors,
Means for calculating each signal to obtain a reproduction signal and a servo error signal;
Focus control means for focusing on the signal surface;
A tracking control hand throw for tracking the track;
Compression means for compressing the recording signal at a first compression rate in predetermined block units;
Code amount extracting means for extracting the code amount of data at the time of compression;
Code amount storage means for storing the code amount;
Temporary storage means for temporarily storing the compressed recording signal;
Data remaining amount management means for managing the amount of data stored in the temporary storage
A recording method for controlling a compressed recording signal to be recorded on the optical information recording medium;
Area management means for managing an area recorded on the optical information recording medium,
During the step of storing the compressed data in the temporary storage unit, the compressed data stored in the optical information recording medium is read out, and the compressed data is stored in the code amount storage unit according to the first amount. Having a second compression means for recompressing at the same or higher compression rate than the compression rate,
An optical information recording / reproducing apparatus which records data compressed by the second compression means so that predetermined block units are continuously connected by the area management means on the optical information recording medium. Compression means for compressing an input signal such as audio or video at a first compression rate in predetermined block units, means for sequentially storing the compressed first data in the temporary storage means, and storage in the temporary storage means. A first system comprising means for writing data stored at a stage when the amount of data reached a predetermined amount to a second storage means,
Compression means for compressing an input signal such as audio or video at a first compression rate in predetermined block units, difficulty extraction means for extracting the difficulty of data at the time of compression, and difficulty storage for storing the difficulty Means, means for sequentially storing the compressed first data in the temporary storage means, and writing of the stored data to the second storage means when the amount of data stored in the temporary storage means reaches a predetermined amount. Means for reading compressed data stored in the second storage means during the step of storing the compressed data in the temporary storage means, and storing the compressed data in accordance with the difficulty value stored in the difficulty storage means. A second compression means for recompressing the data at the same or higher compression rate than the first compression rate, and storing the data compressed by the second compression means in the second storage means. System and ,
A recording apparatus which selects one of the systems according to the properties of an input signal such as audio or video or the setting of a compression mode. Compression means for compressing input signals such as audio and video at a first compression rate in predetermined block units, means for sequentially storing the compressed first data in temporary storage means, and A first system comprising means for writing data stored at a stage when the data has reached a predetermined amount to the second storage means,
A compression method for compressing an input signal such as audio or video at a first compression rate in predetermined block units, a code amount extracting means for extracting a code amount of data at the time of compression, and a code amount for storing the code amount Storage means, means for sequentially storing the compressed first data in the temporary storage means, and data stored when the data stored in the temporary storage hand throw reaches a predetermined amount in the second storage means. Writing means, and reading the compressed data stored in the second storage means during the storage in the first storage means, and in accordance with the code amount stored in the code amount storage means, A second compression unit for compressing the compressed data again at the same or higher compression rate than the first compression rate, and storing the data compressed by the second compression unit in the second storage unit. With two systems ,
A recording apparatus which selects one of the systems according to the properties of an input signal such as audio or video or the setting of a compression mode. An optical information recording and reproducing apparatus for recording and reproducing digital signals on an optically recordable optical information recording medium,
A laser generating means for optically recording and reproducing information from a track, a pickup means for detecting reflected light by a plurality of divided sensors, and a means for calculating respective signals to obtain a reproduced signal and a servo error signal. Throwing, focus control means for focusing on the signal surface, tracking control manual throwing for tracking the track, compression means for compressing the recording signal in a predetermined block unit at a first compression rate, and temporarily storing the compressed recording signal. A temporary storage unit for storing; a data remaining amount management unit for managing an amount of data stored in the temporary storage unit; and a recording unit for controlling to record a compressed recording signal on the optical information recording medium. A first system with
Compression means for compressing the recording signal at a first compression rate in predetermined block units; difficulty extraction means for extracting the difficulty level of the data at the time of compression; difficulty storage means for storing the difficulty level; A temporary storage unit for temporarily storing a recording signal, a data remaining amount managing unit for managing an amount of data stored in the temporary storage unit, and controlling to record a compressed recording signal on the optical information recording medium. Recording means for reading out the compressed data stored in the optical information recording medium during the storing in the temporary storage means, and in accordance with the difficulty value stored in the difficulty storage means, A second compression means for compressing the data again at the same or higher compression rate than the first compression rate, wherein a predetermined block unit of the data compressed by the second compression means is the optical information. And a second system for recording so as to be connected continuously on the recording medium,
An optical information recording / reproducing apparatus characterized in that one of the systems is selected according to the properties of an input signal such as audio or video, the setting of a compression mode, or the state of the optical information recording medium. An optical information recording and reproducing apparatus for recording and reproducing digital signals on an optically recordable optical information recording medium,
A laser generating means for optically recording and reproducing information from a track, a pick-up method for detecting a reflected light by a plurality of divided sensors, and a means for calculating respective signals to obtain a reproduced signal and a servo error signal. Focus control means for focusing on the signal surface; tracking control means for tracking the track; compression means for compressing the recording signal at a first compression rate in predetermined block units; and temporarily storing the compressed recording signal. A temporary storage unit, a data remaining amount management unit that manages an amount of data stored in the temporary storage unit, and a recording unit that controls recording of a compressed recording signal on the optical information recording medium. One system,
Compression means for compressing the recording signal at a first compression rate in predetermined block units; code amount extraction means for extracting the code amount of data at the time of compression; code amount storage means for storing the code amount; Temporary storage means for temporarily storing the compressed recording signal, data remaining amount management means for managing the amount of data stored in the temporary storage means, and control to record the compressed recording signal on the optical information recording medium. Recording means for reading out the compressed data stored in the optical information recording medium during the step of storing the compressed data in the temporary storage means, and storing the compressed data in accordance with the code amount stored in the code amount storage means. A second compression means for recompressing at the same or higher compression rate than the first compression rate, wherein the data compressed here is converted into a predetermined block unit on the optical information recording medium. As lead to-sustaining, and a second system for storing,
An optical information recording / reproducing apparatus characterized in that one of the systems is selected according to the properties of an input signal such as audio or video, the setting of a compression mode, or the state of the optical information recording medium. A compression step of compressing an input signal such as audio or video at a first compression rate in predetermined block units;
A difficulty extraction step of extracting the difficulty of the data at the time of compression;
A difficulty storage step for storing the difficulty;
Sequentially storing the compressed first data in temporary storage means;
Writing the stored data to the second storage means when the data stored in the temporary storage means has reached a predetermined amount, and storing the data in the temporary storage means, Reading compressed data stored in the second storage means;
A second compression step of compressing the compressed data again at the same or higher compression rate than the first compression rate, according to the difficulty value stored in the difficulty storage step;
Storing the data compressed in the second compression step in the second storage means;
A recording method characterized by comprising: A compression step of compressing an input signal such as audio or video at a first compression rate in predetermined block units;
A code amount extracting step of extracting a code amount of data at the time of compression;
A code amount storing step of storing the code amount;
Sequentially storing the compressed first data in temporary storage means;
Writing the data stored in the temporary storage means when the data stored in the temporary storage means has reached a predetermined amount in the second storage means, and storing the data in the temporary storage means, Reading compressed data stored in the second storage means;
A second compression step of compressing the compressed data again at the same or higher compression rate than the first compression rate, according to the code amount stored in the code amount storage step;
Storing the data compressed in the second compression step in the second storage means;
A recording method characterized by comprising: An optical recording method for recording a digital signal on an optically recordable optical information recording medium,
A focus control step of focusing the pickup on the signal surface;
A tracking control step of tracking the pickup to a truck;
A compression step of compressing the recording signal at a first compression rate in predetermined block units;
A difficulty extraction step of extracting the difficulty of the data at the time of compression;
A difficulty storage step for storing the difficulty;
A temporary storage step of temporarily storing the compressed recording signal;
A data remaining amount management step of managing the data amount stored in the temporary storage means,
Moving the pickup to a first area of the optical recording medium;
A recording step of controlling to record the compressed recording signal in the first area of the optical recording medium;
Moving the pickup to the first area of the optical recording medium during the storing in the temporary storage means;
Reading compressed data stored in the optical recording medium;
A second compression step of compressing the compressed data again at the same or higher compression rate than the first compression rate, according to the difficulty value stored in the difficulty storage step;
Moving the pickup to a second area of the optical recording medium, such that the data compressed in the second compression step is such that a predetermined block unit is continuously connected on the optical recording medium;
Storing the data moved to the second area. An optical recording method for recording a digital signal on an optically recordable optical information recording medium,
A focus control step of focusing the pickup on the signal surface;
A tracking control step of tracking the pickup to a truck;
A compression step of compressing the recording signal at a first compression rate in predetermined block units;
A code amount extracting step of extracting a code amount of data at the time of compression;
A code amount storing step of storing the code amount;
A temporary storage step of recording the compressed recording signal in temporary storage means,
A data remaining amount management step of managing the data amount stored in the temporary storage means,
Moving the pickup to a first area of the optical recording medium;
A recording step of controlling to record the compressed recording signal in the first area of the optical recording medium;
Moving the pickup to the first area of the optical recording medium during the storing in the temporary storage means;
Reading compressed data stored in the optical recording medium;
A second compression step of compressing the compressed data again at the same or higher compression rate than the first compression rate, according to the code amount stored in the code amount storage step;
Moving the pickup to a second area of the optical recording medium, such that the data compressed in the second compression step is such that a predetermined block unit is continuously connected on the optical recording medium;
Storing the data moved to the second area.

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