JP2002025192A - Digital recording and reproducing device, and digital recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and suitably record/reproduce data by adjusting quality level of a moving picture and sound to be matched with the capacity of a recording medium. SOLUTION: A control processing part 6 sets quality level of the moving picture and sound to be recorded on an optical disk 1 to display the quality level in a display part 7. The control processing part 6 judges whether or not the displayed quality level have been agreed based on the instruction information inputted from a key entry part. When the quality level is judged as disagreed, the control processing part 6 specifies the quality level of the moving picture and sound to be recorded on the optical disk 1 based on the instruction information inputted from the key entry part 8. Then, the control processing part 6 specifies the quality level in the case of re-compressing the moving picture and sound already recorded on the optical disk 1 to display the specified level in the display part 7. When the quality level is agreed, a 2nd recording and reproduction processing part 5 changes the compression ratio of the data recorded on the optical disk 1 and records them again.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for digitizing moving images and sounds, compressing the data, and recording the data on a recording medium.
Also, the present invention relates to a digital recording / reproducing apparatus for reproducing moving images and sounds by expanding data recorded on a recording medium, and in particular, appropriately adjusting the quality level of moving images and sounds according to the capacity of the recording medium. The present invention relates to a digital recording / reproducing apparatus capable of reproducing.

[0002]

2. Description of the Related Art There is known a technique in which video data and audio data obtained by digitizing a video signal and an audio signal and then compressing the data are recorded on a recording medium such as an optical disk and can be reproduced. FIG. 10 is a diagram exemplifying a configuration of a conventional digital recording / reproducing apparatus capable of recording and reproducing such video data and audio data on an optical disk.

In the conventional digital recording / reproducing apparatus shown in FIG. 10, when a video signal is input from a video input terminal VI at the time of data recording, a video input processing section 108 digitizes the video signal to generate video data. Compression processing unit 1
09 is coded and compressed. Also, audio input terminal AI
When an audio signal is input from (R) and AI (L), the audio input processing unit 110 generates digitized audio data, and the audio encoding / compression processing unit 111 encodes and compresses the audio data. The AV multiplexing unit 107 multiplexes the video data generated by the video encoding / compression processing unit 109 and the audio data generated by the audio encoding / compression processing unit 111, amplifies the data through the RF amplifier 104, and Supply to pickup 103. The optical pickup 103 records data by emitting a laser beam and irradiating the optical disc 101 with the laser beam.

In the conventional digital recording / reproducing apparatus shown in FIG. 10, during data reproduction, the optical pickup 103 detects a laser beam reflected on the optical disk 101 to generate a data signal, and amplifies the data signal through the RF amplifier 104. After that, it is supplied to the AV separation processing unit 112. The AV separation processing unit 112 separates the signal received from the RF amplifier 104 into video data and audio data, and sends them to the video decoding / decompression processing unit 114 and the audio decoding / decompression processing unit 116, respectively. The video output processing unit 113 converts the video data decoded by the video decoding / decompression processing unit 114 into a video signal and outputs the video signal from the video output terminal VO. The audio output processing unit 115 converts the audio data decoded by the audio decoding / decompression processing unit 116 into an audio signal and outputs the audio signal from audio output terminals AO (R) and AO (L).

In such a conventional digital recording / reproducing apparatus, the recordable time is specified according to the type of recording medium such as the optical disk 101, for example. That is, for example, if the optical disc 101 for recording for 2 hours is used in the standard mode, the recording / reproducing of the moving image and the audio for 2 hours or the maximum determined by the standard of the device, for example, is n times (n is 2) Recording / reproduction is possible with a recording / reproduction time of (the above integer).

[0006]

In the above-mentioned conventional digital recording / reproducing apparatus, it is necessary to make fine adjustments for newly recording moving images and sounds in consideration of the remaining capacity of the recording medium such as the optical disk 101.

For example, the conventional digital recording / reproducing apparatus shown in FIG. 10 selects one of a standard mode and a mode for recording / reproducing with triple the recording / reproducing time (triple mode), and It is assumed that recording is possible.
Here, it is assumed that the optical disk 101 has a recording / reproducing capacity of 2 hours in the standard mode, and that a moving image and a sound of 1 hour 30 minutes have already been recorded in the standard mode. In this case, based on the remaining capacity of the optical disc 101, the remaining time is 30 minutes in the standard mode and 1 hour in the triple mode.
Recording is possible for 0 minutes. Therefore, in order to record two more hours of video and audio, either give up recording for 30 minutes, or delete video and audio recorded on the optical disc 101 for 10 minutes and record in triple mode. Must.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a digital recording / reproducing method capable of easily and appropriately recording / reproducing by adjusting the quality level of a moving image and a sound in accordance with the capacity of a recording medium. It is intended to provide a device.

[0009]

In order to achieve the above object, a digital recording / reproducing apparatus according to a first aspect of the present invention digitizes a video signal and an audio signal input from an input terminal and compresses the data after compressing the data. A first recording / reproducing means for recording on a recording medium, reproducing a video signal and an audio signal from data read from the recording medium, and outputting the reproduced signal from an output end; and changing a compression ratio of data recorded on the recording medium. And a second recording / reproducing means for re-recording on the recording medium.

According to the present invention, the video signal and the audio signal input from the input terminal are digitized and data-compressed and then recorded on the recording medium, and the compression ratio of the data already recorded on the recording medium is changed. Can be re-recorded. Thereby, the remaining capacity of the recording medium can be increased in accordance with the quality level of the moving image and the sound to be newly recorded, and the moving image and the sound can be easily and appropriately recorded / reproduced at the quality level desired by the user. .

More specifically, the first recording / reproducing means includes first data recording / reproducing means for recording and reproducing data on and from the recording medium, and data reproduced by the first data recording / reproducing means. First data separating means for separating video data and audio data, moving picture reproducing means for expanding the video data separated by the first data separating means to reproduce a video signal, and outputting from a video output end; The audio data separated by the first data separation unit is expanded to reproduce an audio signal, an audio reproduction unit outputting from an audio output terminal, and a video signal input from a video input terminal are digitized and compressed. First video data generating means for generating video data; and audio data obtained by digitizing an audio signal input from an audio input terminal and compressing the data. First audio data generating means for generating data, multiplexing video data generated by the first video data generating means and audio data generated by the first audio data generating means, A first data multiplexing means for causing the first data recording / reproducing means to record on the recording medium,
The second recording / reproducing means records and reproduces data on / from the recording medium, and separates the data reproduced by the second data recording / reproducing means into video data and audio data. Second data separating means, video decoding means for decoding video data separated by the second data separating means, audio decoding means for decoding audio data separated by the second data separating means, First data recompression means for recompressing the video data decoded by the video decoding means at a compression rate different from the compression rate used by the video decoding means, and audio decoded by the audio decoding means A second method for recompressing data at a compression rate different from the compression rate used when the audio decoding means decodes the data.
Multiplexing the video data recompressed by the first data recompression means and the audio data recompressed by the second data recompression means to obtain the second data It is desirable to have a second data multiplexing means for recording on the recording medium by the recording and reproducing means.

[0012] An instruction information input means for inputting instruction information for designating a time for recording a moving image and a sound, and when the instruction information is input by the instruction information input means, based on the remaining capacity of the recording medium, Processing means for specifying a first quality level of a moving image and a sound when data corresponding to the moving image and the sound for the recording time designated by the instruction information is recorded on the recording medium; Display means for displaying the quality level.

The processing means determines from the instruction information input by the instruction information input means whether or not there has been agreement with the first quality level displayed on the display means. It is preferable that the first recording / reproducing means is controlled to record data corresponding to the moving image and audio of the first quality level for which the consent has been given, on the recording medium.

The processing means determines from the instruction information input by the instruction information input means whether or not there is consent to the first quality level displayed on the display means. Specifying, from the instruction information from the instruction information input means, a second quality level of the moving image and the audio when the data corresponding to the moving image and the audio is recorded on the recording medium; It is desirable to specify a third quality level of the moving image and the sound when re-compressing the data corresponding to the moving image and the sound, and to display the third quality level on the display means.

[0015] The processing means determines whether or not the third quality level displayed on the display means has been agreed from the instruction information input by the instruction information input means. Controlling the second recording / reproducing means to change the compression ratio of data corresponding to moving images and audio already recorded on the recording medium, and
Data corresponding to the moving image and the sound of the second quality level is re-recorded on the recording medium, and the first recording / reproducing means is controlled to newly store the data corresponding to the moving image and the sound of the second quality. It is desirable to record on a recording medium.

In a digital recording method according to a second aspect of the present invention, there is provided a first instruction information inputting step of inputting instruction information for designating a moving image and audio time to be recorded on a recording medium, and a remaining capacity of the recording medium. A first quality level of the moving image and the sound when the data corresponding to the moving image and the sound for the recording time specified by the instruction information input in the first instruction information input step is recorded on the recording medium. A first quality level specifying step for specifying the first quality level; a first quality level displaying step for displaying the first quality level specified in the first quality level specifying step on a display; and the first quality level. A first determining step of determining whether there is consent to the first quality level displayed in the displaying step, and a first quality level in the first determining step If it is determined that there is consent, the video signal input from the video input terminal and the audio signal input from the audio input terminal are digitized and data-compressed to support moving images and audio of the first quality level. A first data recording step of generating data to be recorded and recording the data on the recording medium; and specifying a second quality level when it is determined in the first determination step that there is no agreement with the first quality level. A second instruction information inputting step of inputting instruction information to be performed, and a second quality level specified by the instruction information input in the second instruction information inputting step. A second quality level specifying step of specifying a third quality level when recompressing data corresponding to a moving image and a sound which is present; A second quality level displaying step of displaying the third quality level specified in the step on the display, and determining whether or not there is consent to the third quality level displayed in the second quality level displaying step. A second determining step of determining;
When it is determined in step (d) that there is consent to the third quality level, the compression rate of the data corresponding to the moving image and the sound already recorded on the recording medium is changed to change the moving image of the third quality level. And data corresponding to the audio is re-recorded on the recording medium, and the video signal input from the video input terminal and the audio signal input from the audio input terminal are digitized and the data is compressed, so that the second And a second data recording step of generating data corresponding to the moving image and the audio of the quality level and recording the data on the recording medium.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a digital recording / reproducing apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a digital recording / reproducing apparatus according to an embodiment of the present invention. This digital recording / reproducing device is a device capable of recording and reproducing moving images and sounds in a digital form by recording / reproducing data on / from an optical disc 1, for example. As shown in FIG. 2, optical pickups 3a and 3b, first and second recording / reproducing processing units 4, 5
, A control processing unit 6, a display unit 7, a key input unit 8, and a servo processing unit 10. Here, the first and second
The recording and reproduction processing units 4 and 5, the control processing unit 6, and the servo processing unit 10 are connected by a bus 9.

The spindle motor 2 includes a servo processing unit 10
Is to rotate the optical disk 1 held by the turntable or the clamp mechanism at a predetermined rotation speed.

The optical pickups 3a and 3b irradiate the optical disk 1 with a laser beam and enable recording / reproduction of data in which video data and audio data are multiplexed. The optical pickup 3a emits a relatively high-level laser beam corresponding to the data signal received from the first recording / reproducing processing unit 4, and irradiates the recording surface of the optical disc 1 with the laser beam. Further, the optical pickup 3 a emits a relatively low level laser beam, detects a data signal by return light from the optical disc 1, and sends the data signal to the first recording / reproducing processing unit 4. The optical pickup 3 b emits a relatively high-level laser beam corresponding to the data signal received from the second recording / reproducing processing unit 5 and irradiates the recording surface of the optical disc 1. The optical pickup 3b emits a relatively low level laser beam,
The data signal is detected by the return light from the optical disc 1,
It is sent to the second recording / reproducing processing unit 5.

The first recording / reproducing processing unit 4 includes, for example, a DSP
(Digital Signal Processor), etc., and prepares a signal for recording data on the optical disc 1.
This is for reproducing a video signal and an audio signal corresponding to a moving image and an audio recorded on the optical disc 1. FIG. 2 is a diagram illustrating a configuration of the first recording / reproducing processing unit 4. As shown in the figure, the first recording / reproducing processing unit 4 executes an AV (Audio / Vide
o) Multiplexer 11, video input processor 12, video encoding / compression processor 13, audio input processor 14
An audio encoding / compression processing unit 15, an AV separation processing unit 16, a video output processing unit 17, a video decoding / decompression processing unit 18, an audio output processing unit 19, an audio decoding / decompression processing unit 20, An RF (Radio Frequency) amplifier 21 is provided.

The AV multiplexing unit 11 multiplexes the video data received from the video encoding / compression processing unit 13 and the audio data received from the audio encoding / compression processing unit 15 into one data stream. is there. AV
The multiplexing unit 11 converts the data signal generated by the multiplexing into
The signal is supplied to the optical pickup 3a through the RF amplifier 21.

The video input processing unit 12 includes, for example, an LPF
(Low Pass Filter), ADC (Analog / Digital Conver
ter) for digitizing the video signal input from the video input terminal VI. For example, the video input processing unit 12 removes aliasing by limiting the band of the video signal input from the video input terminal VI, and then performs sampling or pulse code modulation (P
CM: Pulse Code Modulation) or the like is executed and digitized. Further, the video input processing unit 12 adds address information, error correction information, and the like to the digitized video signal. The video signal digitized in this way is
The video data is sent to the video encoding / compression processing unit 13 as video data.

The video encoding / compression processing unit 13 is composed of, for example, an inter-frame encoder, a quantization circuit, and the like, and encodes and compresses video data. For example, the video encoding / compression processing unit 13 quantizes the video data received from the video input processing unit 12 according to the quantization step size specified by the control processing unit 6 to compress the data amount, and the AV multiplexing unit 11 Send to

The audio input processing unit 14, for example, LP
F, ADC, etc., for digitizing the audio signal input from the audio input terminal AI. For example, the audio input processing unit 14 removes aliasing by limiting the band of the audio signal input from the audio input terminal AI, and then performs sampling, pulse code modulation, and the like to digitize. Further, the audio input processing unit 14 adds address information, error correction information, and the like to the digitized audio signal. The audio signal thus digitized is sent to the audio encoding / compression processing unit 15 as audio data.

The audio encoding / compression processing unit 15 is composed of, for example, an orthogonal transform encoder, a quantization circuit, and the like, and encodes and compresses audio data. For example, the audio encoding / compression processing unit 15 converts the audio data received from the audio input processing unit 14 into
The audio data that has been quantized by the quantization step size specified by the control processing unit 6 and subjected to data compression is A
This is sent to the V multiplexing unit 11.

The AV separation processing section 16 receives a data signal from the optical pickup 3a through the RF amplifier 21 and separates the data signal into video data and audio data. The AV separation processing section 16 sends the separated video data to the video decoding / decompression processing section 18 and sends the separated audio data to the audio decoding / decompression processing section 20.

The video output processing unit 17 includes, for example, a DAC
(Digital / Analog Converter) and the like. The video decoding / decompression processing unit 18 converts the video data decoded and decompressed into a video signal, and outputs the video signal from a video output terminal VO.

The video decoding / decompression processing section 18 is for decoding and decompressing the video data. The video decoding / decompression processing section 18 decodes the video data received from the AV separation processing section 16 and sends it to the video output processing section 17.

The audio output processing unit 19 includes, for example, a DA
C, etc., converts the audio data decoded and expanded by the audio decoding and expansion processing unit 20 into an audio signal, and outputs it from an audio output terminal AO.

The audio decoding / decompression processing section 20 is for decoding and decompressing audio data.
The audio data received from the V separation processing section 16 is decoded and sent to the audio output processing section 19.

The RF amplifier 21 is an amplification circuit for amplifying a data signal received from the optical pickup 3a or the AV multiplexing unit 11. That is, the RF amplifier 21 amplifies the data signal received from the optical pickup 3a and sends it to the AV separation processing unit 16. Further, the RF amplifier 21 amplifies the data signal received from the AV multiplexing unit 11 and sends it to the optical pickup 3a. Further, the RF amplifier 21 amplifies the data signal sent from the control processing unit 6 and amplifies the data signal.
a, the data generated by the control processing unit 6 is recorded on the optical disc 1. Furthermore, RF amplifier 2
Under the control of the control processing unit 1, for example, the optical pickup 3 a reads a volume / file structure or the like recorded on the inner peripheral side of the optical disc 1 and sends the obtained data signal to the control processing unit 6.

The second recording / reproducing processing unit 5 includes, for example, a DSP
And the like, and as shown in FIG.
Video encoding / compression processing unit 23, video decoding / expansion processing unit 24, audio encoding / compression processing unit 25, audio decoding / expansion processing unit 26, and AV separation processing unit 27
And an RF amplifier 28.

The AV multiplexing section 22 has a configuration similar to that of the AV multiplexing section 11, and includes the video data received from the video encoding / compression processing section 23 and the audio encoding / compression processing section 25.
A data signal generated by multiplexing with the audio data received from the optical pickup 3b is supplied to the optical pickup 3b through the RF amplifier 28.

The video encoding / compression processing unit 23 has the same configuration as that of the video encoding / compression processing unit 13 and recompresses the video data expanded by decoding by the video decoding / expansion processing unit 24. It is. For example, the video encoding / compression processing unit 23 encodes the video data (AV separation processing unit 2) decoded by the video decoding / expansion processing unit 24 by encoding at the quantization step size specified by the control processing unit 6.
7 can be recompressed at a compression rate different from the data compression rate.

The video decoding / decompression processing section 24 has the same configuration as the video decoding / decompression processing section 18 and decodes and decompresses the video data sent from the AV separation processing section 27.

The audio encoding / compression processing unit 25 has the same configuration as the audio encoding / compression processing unit 15 and recompresses audio data expanded by decoding by the audio decoding / expansion processing unit 26. It is. For example, the audio encoding / compression processing unit 25 includes the control processing unit 6
, At a compression rate different from the data compression rate of the audio data (audio data separated by the AV separation processing section 27) decoded by the audio decoding / decompression processing section 26 by encoding at the quantization step size specified by Can be recompressed.

The audio decoding / decompression processing section 26 has the same configuration as the audio decoding / decompression processing section 20,
This is for decoding and expanding the audio data sent from the separation processing unit 27.

The AV separation processing section 27 includes the AV separation processing section 1
6, and receives a data signal from the optical pickup 3b through the RF amplifier 28 and separates the data signal into video data and audio data. The AV separation processing unit 27
The separated video data is sent to the video decoding / decompression processing unit 24, and the separated audio data is sent to the audio decoding / decompression processing unit 26.

The RF amplifier 28 has the same configuration as the RF amplifier 21 and includes the optical pickup 3b and the AV multiplexing unit 22.
To amplify the data signal received from. That is, the RF amplifier 28 amplifies the data signal received from the optical pickup 3b and sends it to the AV separation processing unit 27. Further, the RF amplifier 28 amplifies the data signal received from the AV multiplexing unit 22 and sends it to the optical pickup 3b. Also, the RF amplifier 28
Amplifies the data signal sent from the control processing unit 6 and supplies the amplified data signal to the optical pickup 3b.
Is recorded on the optical disc 1. Further, the RF amplifier 28 operates according to the control of the control processing unit 6.
For example, it causes the optical pickup 3b to read the volume / file structure and the like recorded on the inner circumference side of the optical disc 1, and sends the obtained data signal to the control processing unit 6.

Returning to FIG. 1, the control processing unit 6
It is composed of a PU (Central Processing Unit) and the like, and controls the operation of the entire digital recording / reproducing apparatus.

The display unit 7 is, for example, an LCD (Liquid Cryst).
al Display) panel for displaying, for example, an image indicating the quality level of a moving image to be recorded on the optical disc 1 under the control of the control processing unit 6.

The key input unit 8 is composed of, for example, a keypad, a remote control unit, etc., and is used to input instruction information for instructing the control processing unit 6 to operate.

The servo processing unit 10 controls the operation of the spindle motor 2 in accordance with an instruction from the control processing unit 6 for recording / reproducing data on / from the optical disk 1.

The operation of the digital recording / reproducing apparatus according to the embodiment of the present invention will be described below. This digital recording / reproducing apparatus includes a capacity of the optical disc 1 and a capacity of the optical disc 1.
This is a device that can adjust the quality level of moving images and audios in accordance with the amount of moving images and audios to be recorded on the device and perform recording / reproduction.

In this digital recording / reproducing apparatus, after the optical disk 1 is set so that data can be written / read by the optical pickups 3a and 3b, the user operates the key input unit 8 to thereby create a moving image. And an instruction to record the sound on the optical disc 1 is input.
The processing shown in the flowchart of FIG. 4 is executed.

That is, the control processing unit 6 is provided with the key input unit 8
Receiving instruction information for instructing recording from the optical disk 1
The input of the desired recording time T of the moving image and audio to be recorded is received. The user operates the key input unit 8 to input a desired recording time T indicating the amount of moving image and audio desired to be recorded on the optical disk 1 (step S1).

The control processing unit 6 includes a first recording / reproducing processing unit 4
Alternatively, by controlling the second recording / reproducing processing unit 5, the optical disc 1
Is read to obtain management information and the like, and the maximum capacity D that can be recorded on the optical disc 1 is specified (step S2). For example, the control processing unit 6 controls the RF amplifier 21 included in the first recording / reproducing processing unit 4 to read the volume / file structure recorded on the inner circumference side of the optical disc 1 into the optical pickup 3.
Let a read. The RF amplifier 21 sends a data signal obtained by the optical pickup 3a reading the volume / file structure to the control processing unit 6. The control processing unit 6 specifies the structure of the data recorded on the optical disc 1 from the data signal received from the RF amplifier 21, and determines the recording time of the already recorded moving image and audio, the total capacity of the optical disc 1, etc. 1 is specified as the maximum capacity D.

The control processing unit 6 uses the specified maximum capacity D and the desired recording time T to perform digital encoding such as a data compression ratio for recording moving images and audio for the desired recording time T in an empty area of the optical disc 1. Are determined (step S3).

At this time, the control processing section 6 causes the display section 7 to display the quality level of the moving image and the sound to be recorded on the optical disk 1 and presents them to the user (step S4). For example, when compressing a moving image in the time axis direction together with data compression in a frame by using motion prediction coding, the control processing unit 6 determines based on the maximum capacity D and the desired recording time T. To determine the average transfer bit rate. The control processing unit 6 sets a quality level corresponding to the average transfer bit rate,
It is displayed on the display unit 7. Thereby, the user can easily know the quality level to record the moving image and the audio in the free area of the optical disc 1.

The user operates the key input unit 8 to input instruction information indicating whether or not the user can agree with the presented quality level. The control processing unit 6 determines whether or not there is consent to the presented quality level based on the instruction information input from the key input unit 8 (step S5).

When the control processing unit 6 determines that there is consent to the presented quality level (YE in step S5)
S), for example, the first recording / reproducing processing unit 4 is controlled to execute a process for recording (recording) a moving image and a sound in a free area of the optical disc 1 (step S6). At this time, the control processing unit 6 specifies, for example, a quantization step size or the like corresponding to the agreed quality level, and the video encoding / compression processing unit 13 and the audio encoding / compression provided in the first recording / reproducing processing unit 4. Notify the processing unit 15. Further, the control processing unit 6 sends information indicating a compression ratio of data to be recorded on the optical disc 1 to the AV multiplexing unit 11 provided in the first recording / reproducing processing unit 4, and multiplexes the information with the video data and the audio data. The data is recorded on the optical disc 1.

On the other hand, if control processing unit 6 determines that there is no consent to the presented quality level, that is, the presented quality level has been denied by the user (NO in step S5), instruction from key input unit 8 The information is received, and the quality level desired by the user is obtained. On this occasion,
The user can designate a desired quality level by operating the key input unit 8 (step S).
7).

When the quality level desired by the user is designated, the control processing unit 6 obtains the capacity required to record the moving image and the sound for the desired recording time T at the designated quality level (step S8). ). If the quality level specified by the user is higher than the quality level presented in step S4, the optical disc 1
Must be recompressed to increase the remaining capacity of the optical disc 1 so that a moving image and a sound can be recorded for a desired recording time T at a quality level desired by the user.

Therefore, the control processing unit 6 has already recorded on the optical disc 1 a new video and audio for the desired recording time T at the quality level desired by the user. Identify the level of video and audio quality that must be achieved. That is, the control processing unit 6 controls, for example, the RF amplifier 21 included in the first recording / reproducing processing unit 4 to reproduce data recorded on the optical disc 1 through the optical pickup 3a. The control processing unit 6 specifies the compression ratio of the data reproduced by the first recording / reproduction processing unit 4, obtains the compression ratio at the time of recompression in order to increase the remaining capacity of the optical disk 1, and records the data on the optical disk 1. The quality level when re-compressing the moving image and the sound is specified. The control processing section 6 causes the display section 7 to display the quality level when the moving image and the sound already recorded on the optical disc 1 are recompressed, and presents them to the user (step S9).

The user operates the key input unit 8 to input instruction information indicating whether or not the user can agree with the presented quality level. The control processing unit 6 determines whether or not there is consent to the presented quality level based on the instruction information input from the key input unit 8 (step S10).

When the control processing unit 6 determines that there is consent to the presented quality level (Y in step S10)
ES), and the process proceeds to step S6.
For recording a moving image and audio. At this time, the control processing unit 6, for example,
A quantization step size or the like corresponding to the quality level agreed at 10 is specified, and is notified to the video encoding / compression processing unit 23 and the audio encoding / compression processing unit 25 included in the second recording / reproducing processing unit 5. Further, the control processing unit 6 specifies the quantization step size and the like corresponding to the quality level specified by the user in step S7, and the video encoding / compression processing unit 13 provided in the first recording / reproducing processing unit 4 includes: The audio encoding / compression processing unit 15 is notified. Further, the control processing unit 6 stores information indicating a compression rate of data to be recorded on the optical disc 1 and the like in the AV multiplexing unit 11 provided in the first recording / reproducing processing unit 4 and the AV data provided in the second recording / reproducing processing unit 5. The data is sent to the multiplexing unit 22 and multiplexed with the video data and the audio data to be recorded on the optical disc 1.

On the other hand, if the control processing unit 6 determines that there is no consent to the presented quality level, that is, if the presented quality level has been denied by the user, the control processing unit 6 determines whether or not to reset the quality level ( Step S1
1). At this time, the user operates the key input unit 8 to input instruction information indicating whether to reset the quality level.

When the control processing section 6 determines from the instruction information sent from the key input section 8 to reset the quality level (YES in step S11), the control processing section 6 executes the processing in step S11.
Proceeding to step 7, the user obtains a desired quality level.

On the other hand, if the control processing unit 6 determines that the quality level is not reset (NO in step S11), it determines that the moving image and the sound desired by the user cannot be recorded (step S12), and The processing shown in the flowchart ends.

Next, the processing executed by the first and second recording / reproducing processing units 4 and 5 in step S6 will be described.
This will be described in more detail with reference to the flowcharts shown in FIGS. Here, in step S5, if the user agrees on the quality level and it is not necessary to recompress the data already recorded on the optical disc 1, only the first recording / reproducing processing unit 4 operates. The moving image and the sound are recorded on the optical disk 1 in the same manner as the normal recording.

That is, in this case, the first recording / reproducing processing unit 4 executes the new recording processing shown in the flowchart of FIG. 5, and first, the video input processing unit 12 converts the video signal input from the video input terminal VI. The data is digitized into video data and input to the video encoding / compression processing unit 13. Also,
The audio input processing unit 14 includes an audio input terminal AI (R),
The audio signal input from the AI (L) is digitized into audio data, and the audio encoding / compression processing unit 1
5 (step S21).

The video encoding / compression processing unit 13 encodes and compresses the video data input by the video input processing unit 12 and sends the encoded data to the AV multiplexing unit 11. The audio encoding / compression processing unit 15 encodes and compresses the audio data input by the audio input processing unit 14,
It is sent to the AV multiplexing unit 11 (step S22).

The AV multiplexing unit 11 multiplexes the video data compressed by the video encoding / compression processing unit 13 and the audio data compressed by the audio encoding / compression processing unit 15 into one data stream, and It is sent to the amplifier 21 (step S23). At this time, the AV multiplexing unit 11 receives the information for data management indicating the data compression ratio and the like from the control processing unit 6, and multiplexes it with the video data and the audio data.

The RF amplifier 21 performs processing such as amplifying the data signal received from the AV multiplexing unit 11 and sends it to the optical pickup 3a.
The multiplexed data is recorded (step S24).

The video input processing unit 12 and the audio input processing unit 14 determine whether or not the input of the video signal and the audio signal is continued (step S25). Is returned to step S21, and the recording of the moving image and the sound is continued.

On the other hand, if it is determined that the input of the video signal and the audio signal is not continued (NO in step S25), the first recording / reproducing processing unit 4 determines that the recording has been completed, and
The new recording process shown in the flowchart of FIG.

After the quality level presented by the control processing unit 6 is denied by the user in step S5, if the quality level is designated by the user in step S7, the optical disc 1 is Recorded video and audio must be recompressed. In this case, the first recording / reproduction processing unit 4 executes the above-described new recording processing, and the second recording / reproduction processing unit 5 executes the recompression recording processing shown in the flowchart of FIG.

When the recompression recording process is started, the second recording / reproducing processing unit 5 reads data already recorded on the optical disk 1 through the optical pickup 3b under the control of the control processing unit 6 (step S31). At this time, R
The F amplifier 28 sends the data signal received from the optical pickup 3b to the AV separation processing unit 27.

The RF amplifier 28 outputs the data signal for erasing according to the control of the control processing section 6 to the optical pickup 3b.
The recording area of the optical disk 1 is released by supplying the data to the area where the data reading has been completed (step S32).

Upon receiving the data signal from the RF amplifier 28, the AV separation processing section 27 separates the data signal into video data and audio data,
To the audio decoding / expansion processing unit 26 (step S
33).

The video decoding / decompression processing section 24 decodes the video data received from the AV separation processing section 27 and sends it to the video encoding / compression processing section 23 for recompression. Also,
The audio decoding / decompression processing unit 26 includes the AV separation processing unit 2
7 is sent to the audio encoding / compression processing unit 25 for decoding and recompressing the audio data received from Step 7 (Step S34).

The video encoding / compression processing unit 23 re-compresses the video data received from the video decoding / decompression processing unit 24 by, for example, quantizing the video data at the quantization step size notified from the control processing unit 6. , To the AV multiplexing unit 22. Further, the audio encoding / compression processing unit 25 recompresses the audio data received from the audio decoding / expansion processing unit 26 and sends the data to the AV multiplexing unit 22 (step S3).
5).

The AV multiplexing unit 22 multiplexes the video data received from the video encoding / compression processing unit 23 and the audio data received from the audio encoding / compression processing unit 25 into one data stream, and (Step S36).

The RF amplifier 28 performs processing such as amplifying the data signal received from the AV multiplexing section 22 and sends the data signal to the optical pickup 3 b, where the data signal is stored in the recordable area of the optical disc 1.
The recompressed data is recorded (step S37).
Thereby, the compression rate of the data corresponding to the moving image and the sound already recorded on the optical disc 1 can be changed to reduce the amount of data, re-record on the optical disc 1, and increase the remaining capacity of the optical disc 1. Can be.

The second recording / reproducing processing unit 5 includes a control processing unit 6
It is determined whether or not recompression of the data recorded on the optical disc 1 has been completed (step S38), and if not (NO), the process returns to step S31. Then, recompression of the data recorded on the optical disc 1 is continued.

On the other hand, when the second recording / reproducing processing section 5 determines that the recompression of the data has been completed (YES in step S38), the second recording / reproducing processing section 5 ends the recompression recording processing shown in the flowchart of FIG.

When reproducing the moving image and the sound recorded on the optical disk 1 in this manner, for example, first, the RF amplifier 21 provided in the first recording / reproducing processing unit 4 separates the data signal received from the optical pickup 3a into an AV signal. Send to processing section 16. Upon receiving the data signal from the RF amplifier 21, the AV separation processing section 16 separates the data signal into video data and audio data, and sends them to the video decoding / decompression processing section 18 and the audio decoding / decompression processing section 20, respectively.

The video decoding / decompression processing section 18 decodes the video data received from the AV separation processing section 16 and sends it to the video output processing section 17. The video output processing unit 17 generates a video signal by converting the video data received from the video decoding / decompression processing unit 18 into an analog signal, and outputs the video signal from the video output terminal VO.

The audio decoding / decompression processing section 20
Decodes the audio data received from the AV separation processing unit 16 and sends it to the audio output processing unit 19. The audio output processing unit 19 generates an audio signal by converting the audio data received from the audio decoding / decompression processing unit 20 into an analog signal, and outputs the audio signal from the audio output terminals AO (R) and AO (L).

As described above, according to the present invention,
When recording (recording) a moving image and a sound for the desired recording time T on the optical disc 1 at a quality level designated by the user, the moving image and the sound already recorded on the optical disc 1 are recompressed and the remaining The capacity can be increased. This eliminates the need for the user to make fine adjustments in consideration of the remaining capacity of the optical disc 1, and allows recording / reproducing by simply and appropriately adjusting the quality level of moving images and audio in accordance with the capacity of the recording medium. it can.

The second recording / reproducing processing unit 5 may be configured in the same manner as the first recording / reproducing processing unit 4 in the above-described embodiment, and is controlled by the control processing unit 6 in the above-described embodiment. May be operated as the second recording / reproducing processing unit 5.

The present invention is not limited to the case where moving images and audio are recorded on the optical disk 1, and for example, as shown in FIG.
The present invention can also be applied to a case where moving images and audio are recorded in a solid-state memory 50 such as a memory card. In this case, a solid-state memory interface unit 51 is provided to record digitalized data of moving images and sounds in the solid-state memory 50 and to read data recorded in the solid-state memory 50. Further, as shown in FIG. 8, the first recording / reproducing processing unit 4
The F amplifier 21 is unnecessary, and the AV multiplexing unit 11 and the AV
The separation processing unit 16 transmits and receives data to and from the solid-state memory interface unit 51 via the bus 9, so that digitized moving images and sounds can be recorded / reproduced in the solid-state memory 50. Further, as shown in FIG. 9, the second recording / reproducing processing unit 5 does not require the RF amplifier 28, and the AV multiplexing unit 22 and the AV separation processing unit 27 communicate with the solid-state memory interface unit 51 via the bus 9. By transmitting and receiving data to and from the solid-state memory 50, digital moving images and sounds can be recorded / reproduced with respect to the solid-state memory 50.

[0084]

As described above, according to the present invention, when a moving image or sound is newly recorded, the compression ratio of data corresponding to the moving image or sound already recorded on the recording medium is changed. Re-recording can increase the remaining capacity. This makes it possible to easily and appropriately record / reproduce by adjusting the quality level of the moving image and the audio in accordance with the capacity of the recording medium.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a digital recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a first recording / reproducing processing unit.

FIG. 3 is a diagram illustrating a configuration of a second recording / reproducing processing unit.

FIG. 4 is a flowchart for explaining the operation of the digital recording / reproducing apparatus according to the embodiment of the present invention.

FIG. 5 is a flowchart for explaining a new recording process.

FIG. 6 is a flowchart illustrating a recompression recording process.

FIG. 7 is a diagram showing a modification of the digital recording / reproducing apparatus.

FIG. 8 is a diagram illustrating a configuration of a first recording / reproducing processing unit in a modified example of the digital recording / reproducing device.

FIG. 9 is a diagram illustrating a configuration of a second recording / reproducing processing unit in a modified example of the digital recording / reproducing device.

FIG. 10 is a diagram illustrating a configuration of a conventional digital recording / reproducing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 101 Optical disk 2, 102 Spindle motor 3a, 3b, 103 Optical pick-up 4, 5 Recording / reproducing processing part 6, 106 Control processing part 7, 118 Display part 8, 119 Key input part 9, 117 Bus 10, 105 Servo processing part 11, 22, 107 AV multiplexing section 12, 108 Video input processing section 13, 23, 109 Video coding / compression processing section 14, 110 Audio input processing section 15, 25, 111 Audio coding / compression processing section 16, 27, 112 AV separation processing unit 17, 113 Video output processing unit 18, 24, 114 Video decoding / decompression processing unit 19, 115 Audio output processing unit 20, 26, 115 Audio decoding / decompression processing unit 21, 28, 104 RF amplifier

Claims (7)

[Claims] 1. A video signal and an audio signal input from an input terminal are digitized and data-compressed, recorded on a recording medium, and a video signal and an audio signal are reproduced from data read from the recording medium, and are reproduced from an output terminal. Digital recording, comprising: first recording / reproducing means for outputting; and second recording / reproducing means for changing a compression rate of data recorded on the recording medium and re-recording the data on the recording medium. Playback device. 2. The first recording / reproducing means includes: first data recording / reproducing means for recording and reproducing data on / from the recording medium; and data reproduced by the first data recording / reproducing means as video data. A first data separation unit for separating the audio data, a video reproduction unit for expanding the video data separated by the first data separation unit to reproduce a video signal, and outputting the video signal from a video output end; Audio reproduction means for expanding the audio data separated by the data separation means to reproduce an audio signal, outputting the audio signal from an audio output end, and digitizing the video signal input from the video input end;
First video data generating means for generating video data which has been compressed, digitizing an audio signal input from an audio input end,
First audio data generation means for generating data-compressed audio data; video data generated by the first video data generation means; and audio data generated by the first audio data generation means. And a first data multiplexing means for recording the data on the recording medium by the first data recording / reproducing means, wherein the second recording / reproducing means records and reproduces data on / from the recording medium. 2 data recording / reproducing means, second data separating means for separating data reproduced by the second data recording / reproducing means into video data and audio data, and video data separated by the second data separating means. Video decoding means for decoding audio data, and audio data separated by the second data separation means. And Dio decoding means, it has been the video data decoded by said video decoding means,
A first data recompression means for recompressing at a compression rate different from a compression rate at the time of decoding by the video decoding means; and an audio decoding means for decoding the audio data decoded by the audio decoding means. A second data recompression means for recompressing at a compression rate different from the compression rate; a video data recompressed by the first data recompression means; and a video data recompressed by the second data recompression means. The digital recording / reproducing apparatus according to claim 1, further comprising: a second data multiplexing unit that multiplexes audio data and records the multiplexed audio data on the recording medium by the second data recording / reproducing unit. 3. An instruction information input means for inputting instruction information for designating a time for recording a moving image and a sound, and when the instruction information is input by the instruction information input means,
Processing means for specifying a first quality level of a moving image and a sound when data corresponding to the moving image and the sound for the recording time specified by the instruction information is recorded on the recording medium, based on the remaining capacity of the recording medium The digital recording / reproducing apparatus according to claim 1, further comprising: a display unit configured to display the first quality level specified by the processing unit. 4. The processing means determines from the instruction information input by the instruction information input means whether or not there is consent to the first quality level displayed on the display means, and determines that there has been consent. The method according to claim 3, wherein in the case, the first recording / reproducing means is controlled to record data corresponding to a moving image and a sound of the first quality level for which the consent has been given, on the recording medium. Digital recording and playback device. 5. The processing means determines from the instruction information input by the instruction information input means whether or not there is consent to the first quality level displayed on the display means, and determines that there is no consent. In this case, based on the instruction information from the instruction information input unit, the second quality level of the moving image and the audio when recording the data corresponding to the moving image and the audio on the recording medium is specified, and the second quality level is already recorded on the recording medium. 5. The digital camera according to claim 3, wherein a third quality level of the moving image and the sound when the data corresponding to the moving image and the sound is recompressed is specified and displayed on the display unit. Recording and playback device. 6. The processing means judges whether or not there is consent to the third quality level displayed on the display means from the instruction information input by the instruction information input means, and determines that there is consent. In this case, the second recording / reproducing means is controlled to change the compression ratio of the data corresponding to the moving image and the sound already recorded on the recording medium, and to perform the third
Data corresponding to the moving image and the sound of the second quality level is re-recorded on the recording medium, and the first recording / reproducing means is controlled to newly store the data corresponding to the moving image and the sound of the second quality. The digital recording / reproducing apparatus according to claim 5, wherein the recording is performed on a recording medium. 7. A first instruction information inputting step of inputting instruction information for designating a moving image and a sound time to be recorded on a recording medium, and the first instruction information inputting step based on a remaining capacity of the recording medium. A first quality level specifying step of specifying a first quality level of video and audio when recording data corresponding to video and audio for a recording time specified by the instruction information input in the recording medium; A first quality level displaying step of displaying on the display the first quality level specified in the first quality level specifying step, and a first quality level displayed in the first quality level displaying step. The first to determine if there is consent
Determining the video signal input from the video input terminal and the audio signal input from the audio input terminal when it is determined in the first determining step that there is consent to the first quality level. Data compression and
A first data recording step of generating data corresponding to a moving image and a sound of a quality level and recording the data on the recording medium; and when it is determined that the first quality level has not been agreed in the first determination step A second instruction information inputting step of inputting instruction information for specifying a second quality level; and a second quality level specified by the instruction information input in the second instruction information inputting step. A second quality level specifying a third quality level when recompressing data corresponding to moving images and audio already recorded on the recording medium.
A quality level specifying step, a second quality level displaying step of displaying the third quality level specified in the second quality level specifying step on the display, and a second quality level displaying step. The second to determine whether there is consent to the displayed third quality level
And when the second determination step determines that the third quality level has been agreed, changes the compression ratio of data corresponding to moving images and audio already recorded on the recording medium. And re-record the data corresponding to the video and audio of the third quality level on the recording medium, and digitize the video signal input from the video input terminal and the audio signal input from the audio input terminal respectively. A second data recording step of generating data corresponding to the moving image and the audio of the second quality level by compressing the data and recording the data on the recording medium.