JP3157497B2 - Information recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus which encodes a moving image by a predetermined method and records it on a medium, and reproduces the recorded moving image. And an information recording / reproducing apparatus capable of reproducing a moving image that has already been recorded.

[0002]

2. Description of the Related Art Magneto-optical recording media have attracted attention as rewritable, large-capacity, and highly reliable recording media, and have begun to be put to practical use as computer memories and the like. Recently, the recording capacity is 6.0 Gby.
The standardization of the magneto-optical recording medium of tes has been promoted and is being put to practical use.

Such a high-density magneto-optical recording medium is capable of recording and reproducing a long-time moving image, and is also capable of accessing an arbitrary location on the medium to newly record information and reproducing the recorded information. It has features not found in conventional video tapes and the like. At present, when moving images of television programs and the like are used, video tapes are mainly used, and reproduction is performed after recording is completed.

[0004]

When a television program is reserved by timer and recorded, when the user returns home after a lapse of a predetermined time from the start of recording, before the recording of the program is completed,
You may want to play the part you have already recorded, or another program that has been previously recorded on the medium, but with conventional videotape,
There was a problem that the part already recorded could not be played.

Accordingly, an object of the present invention is to provide an information recording / reproducing apparatus capable of reproducing an already recorded portion while continuing to record a television program or the like.

[0006]

Means for Solving the Problems and Effects of the Invention In order to solve the above problems, the present invention is an information recording and reproducing apparatus for recording an image on a medium and reproducing the recorded image,
A recording unit that records moving image data formed by encoding a recording image in a predetermined manner on the medium, a reproducing unit that reproduces moving image data recorded on the medium, and based on an input signal, Control means for controlling the recording means and the reproducing means so that the moving image data recorded by the recording means is reproduced by the reproducing means while continuing the recording operation by the recording means; and Means for recording the n-th moving image data by the recording means, and by the time of recording the (n + 1) th moving image data, the m-th moving image data already recorded by the recording means by the reproducing means. The recording means and the reproducing means are controlled so as to reproduce.

[0007] The recording means compresses the recorded image by a predetermined method, and records the encoded moving image data on a medium. The reproducing means reads the moving image data recorded on the medium and reproduces the moving image. Further, the control unit controls the recording unit and the reproducing unit based on the input signal so that the moving image data recorded by the recording unit is reproduced by the reproducing unit while continuing the recording operation by the recording unit.

According to the first aspect of the present invention, after the n-th moving image data is recorded, the m-th moving image already recorded is recorded before the (n + 1) -th moving image data is recorded. Since the data is reproduced, the recording operation and the reproducing operation can be performed without impairing the recording speed of the recording unit and the reproducing speed of the reproducing unit. Since the moving image data already recorded by the recording means is reproduced by the reproducing means while continuing the recording operation by the recording means, the already recorded area can be reproduced even during recording of a television program or the like. Can be.

In the present invention, the control means includes:
The optical unit included in the recording unit and the reproducing unit, the optical unit of the optical unit such that the recording position of the moving image data and the reproduction position of the moving image data recorded by the recording unit are alternately moved. It is characterized by controlling a servo circuit.

According to the second aspect of the present invention, since the control means alternately moves the optical means to the recording position and the reproduction position of the moving image data, the control means uses one optical means for recording. An operation and a reproducing operation can be performed.

Further, in the present invention, the control means is configured to execute n + n from the start of the recording of the n-th moving image data determined from the average rate of the moving image data determined by the standard.
The recording device and the reproducing device are controlled so that a recording operation and a reproducing operation are performed within a time period until recording of the first moving image data is started.

According to the third aspect of the present invention, a recording operation and a reproducing operation can be performed within a fixed time determined by a standard or the like, so that a recording operation can be performed using a standardized medium. And the reproducing operation can be performed in parallel.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. The present invention is based on, for example, the recently standardized A
SMO (Advanced Storage Magn)
This can be realized by using a magneto-optical recording medium called an “optical disc” as a recording medium. With reference to FIG. 1, the configuration and operation of an information recording / reproducing apparatus that reproduces an already recorded portion while recording a television program or the like using ASMO will be described. The information recording / reproducing apparatus according to the present invention includes a magnetic head 2, an optical pickup 3, a reproduction signal amplifying circuit 4, a servo circuit 5, a servo mechanism 6, a spindle motor 7, a synchronization signal generating circuit 8, , Decoder 10, encoder 11
, A memory 12, a timing setting circuit 13, a magnetic head driving circuit 14, a laser driving circuit 15, and a control unit 1.
8 and operation buttons 19. The magnetic head 2
A magnetic field for recording a signal on the magneto-optical recording medium 1 is applied from the magnetic layer side formed on the magneto-optical recording medium 1. The optical pickup 3 irradiates the magneto-optical recording medium 1 with laser light from the transparent substrate side to record or reproduce a signal, and detects the reflected light. The reproduction signal amplifying circuit 4 receives a signal from a photodetector (not shown) included in the optical pickup 3, and amplifies a tracking error signal and a focus error signal among the input signals to predetermined values. Thereafter, the signal is output to the servo circuit 5 and the magneto-optical recording medium 1 is output.
After amplifying the optical signal detected due to the discontinuous area formed in the groove or land to a predetermined value, the amplified signal is output to the synchronization signal generating circuit 8, and the magneto-optical signal is further amplified to the predetermined value. After that, it outputs to the shaper 9. The synchronizing signal generation circuit 8 generates a synchronizing signal based on the optical signal detected due to the discontinuous region, and outputs the generated synchronizing signal to the servo circuit 5, the decoder 10, the encoder 11, the memory 1, and the like.
2, and output to the timing setting circuit 13. The servo circuit 5 rotates the spindle motor 7 in synchronization with the synchronizing signal output from the synchronizing signal generation circuit 8 and performs a servo mechanism based on the tracking error signal and the focus error signal output from the reproduction signal amplifying circuit 4. 6 is controlled. The servo mechanism 6 is controlled to move the optical pickup 3 between the recording position and the reproduction position based on the control from the control unit 18 described later. Spindle motor 7
Rotates the magneto-optical recording medium 1 at a predetermined rotation number by rotating in synchronization with a synchronization signal. The servo mechanism 6
Under the control of the servo circuit 5, tracking servo and focus servo of an objective lens (not shown) in the optical pickup 3 are performed, and the optical pickup 3 is moved to a recording position or a reproduction position of the magneto-optical recording medium 1.

The shaper 9 removes noise from the magneto-optical signal output from the reproduction signal amplifier 4 and outputs the noise to the decoder 10. The decoder 10 demodulates the magneto-optical signal in synchronization with the synchronizing signal output from the synchronizing signal generation circuit 8, restores the compressed moving image to the original, and outputs the restored moving image to the monitor 16. The encoder 11 inputs a moving image signal from input means 17 such as a TV tuner, and converts the input recording data into an MPE.
Moving image data compressed and encoded by the G method is stored in the memory 1
Output to 2. The memory 12 stores the moving image data output from the encoder 11. The modulation circuit 13 reads the moving image data stored in the memory 12 from the memory 12 in synchronization with the synchronization signal output from the synchronization signal generation circuit 8 according to an instruction from the control unit 18, and reads the read moving image data. A recording signal for recording the data for use on the magneto-optical recording medium 1 is generated, and the generated recording signal is output to the magnetic head driving circuit 14 and the laser driving circuit 15. The magnetic head drive circuit 14 drives the magnetic head 2 based on the recording signal from the modulation circuit 13 and the synchronization signal from the synchronization signal generation circuit 8. The laser drive circuit 15 drives a semiconductor laser (not shown) in the optical pickup 3 based on the synchronization signal from the synchronization signal generation circuit 8. When performing optical modulation recording, the laser drive circuit 15 drives the semiconductor laser in the optical pickup 3 based on the recording signal from the modulation circuit 13 and the synchronization signal from the synchronization signal generation circuit 8. The operation button 19 outputs an input signal to the control unit 18 in response to an input by a user. Control unit 18
Controls the servo circuit 5 based on a signal from the operation button 19 to move the optical pickup 3 to a recording position and a reproduction position of moving image data.

The features of the present invention will be described with reference to FIGS. Referring to FIG. 2, in a state where recording of a television program or the like using the magneto-optical recording medium 1 has progressed to some extent, a recorded area 1A and an unrecorded area 1B exist. In the present invention, the moving image data recorded in the recorded area 1A is reproduced while the recording operation in the unrecorded area 1B is continued. Generally, when a moving image is recorded on a medium, as shown in FIG. 3A, image data indicating each scene is formed as a series of data... N-2, n-1, n,.
.., n + 1, n + 2,... Therefore, n-2, n
.., M−2, m−1, m already recorded as shown in FIG. 3B while performing a series of moving image data recording operations of −1, n, n + 1, n + 2,. , M + 1, m +
In the case of reproducing the moving image data of 2,..., After recording the n-th moving image data, before recording the (n + 1) th moving image data, the already recorded m-th moving image It is conceivable to reproduce the data. That is, ... n-
2, n-1, n, n + 1, n + 2,... Have already been recorded by using the available recording time of the moving image data.
., M-2, m-1, m, m + 1, m + 2,...

Referring to FIG. 4, a description will be given of a time chart in which the operation of recording the moving image data and the operation of reproducing the already recorded moving image data are performed in parallel. FIG. 4A is a time chart of recording of moving image data, and FIG. 4B is a time chart of reproduction of already recorded moving image data. The ASMO standard clarifies the relationship between minimum editing time and access time,
The time from the recording start time 40 of the (n-1) th moving image data to the recording start time 41 of the next moving image data is 2
When the time is set to seconds, recording is performed in one second, and a servo capability that does not require a recording operation for the remaining one second is required. The data transfer rate in this case is 18 Mb
ps. Therefore, when the recording operation and the reproducing operation are performed in parallel using the ASMO, the moving image data n-1 is recorded in 0.5 seconds, and the already recorded moving image data is reproduced in 0.5 seconds. It is conceivable that an m-th moving image data is reproduced in 0.5 seconds by accessing a position to be played, and an original recording position is accessed in 0.5 seconds to record the next n-th moving image data. Can be By performing such an operation, a recording operation,
Further, the recording operation and the reproducing operation can be performed in parallel without impairing the speed of the reproducing operation. In this case, the data transfer rate depends on the recording operation, access to the playback position,
It is set so that the reproduction operation and the access to the original recording position are performed within 2 seconds.

In the case where the ASMO is used, if the time from the start of recording to the start of the next recording is set to 2 seconds, the setting is made so that the recording operation and the reproducing operation are performed within this time. , Recording operation, access to the playback position,
The reproduction operation and the access to the original recording position are 0.5
It is not limited to performing in seconds. The operation of the optical pickup 3 when performing the recording operation and the reproducing operation according to the time chart shown in FIG. 4 will be described with reference to FIG. When recording is started from the outer peripheral side of the magneto-optical recording medium 1 and the optical pickup 3 is performing a recording operation at the recording position 50,
When the user presses the operation button 19 to reproduce the moving image data already recorded, the control unit 18
An instruction signal is output to the servo circuit 5 so as to move the optical pickup 3 to the reproduction position 51. The servo circuit 5 controls the servo mechanism 6 based on an instruction signal from the control unit 18, and the servo mechanism 6 moves the optical pickup 3 to the recording position 50.
Then, when the reproducing operation is completed, the optical pickup 3 is moved at the recording position 50 to perform the recording operation. Thereafter, by alternately moving the optical pickup 3 to the recording position 50 and the reproducing position 51, the recording operation and the reproducing operation are performed in parallel.

Referring again to FIG. 1, the operation of the information recording / reproducing apparatus which performs a recording operation and a reproducing operation for reproducing already recorded data in parallel will be described. When the magneto-optical recording medium 1 is mounted on the information recording / reproducing apparatus, the optical pickup 3
The inside semiconductor laser is driven by the laser drive circuit 15, the laser light is irradiated to the magneto-optical recording medium 1, and the reflected light is detected by the photodetector (not shown) in the optical pickup 3, and as described above. A synchronization signal is generated by the synchronization signal generation circuit 8, and the generated synchronization signal and an error signal such as a detected tracking error signal are transmitted to the servo circuit 5.
Sent to The servo circuit 5 rotates the spindle motor 7 in synchronization with the synchronization signal, and performs tracking servo and focus servo of the objective lens (not shown) of the optical pickup 3 via the servo mechanism 6. The synchronization signal is also sent to the encoder 11 and the memory 12, and the recording data input from the input unit 17 is compressed by the encoder 11 in synchronization with the synchronization signal by the MPEG method.
2 is output. The timing setting circuit 13 reads the moving image data stored in the memory 12 in synchronization with the synchronization signal based on the instruction signal from the control unit 18, and reads the read moving image data in synchronization with the synchronization signal. A timing signal in which the timing for recording on the magnetic recording medium 1 is set is generated, and the generated timing signal is output to the magnetic head drive circuit. Magnetic head drive circuit 14
Drives the magnetic head 2 based on the transmitted timing signal, and the magnetic head 2
, An alternating magnetic field is applied to the magneto-optical recording medium 1 to record moving image data. In this case, when recording moving image data using pulsed laser light,
The timing setting circuit 13 also controls the laser driving circuit 15
The generated timing signal is output and the laser drive circuit 15
Drives the semiconductor laser in the optical pickup 3 based on the transmitted timing signal, and the optical pickup 3 irradiates the magneto-optical recording medium 1 with pulsed laser light.

With this operation, during the operation of recording moving image data on the magneto-optical recording medium, the user operates the operation button 1
9 is operated to instruct the reproduction of the already recorded moving image data, the instruction signal input from the operation button 19 is output to the control unit 18, and when the control unit 18 receives the instruction signal, the optical signal A control signal is output to the servo circuit 5 so as to move the pickup 3 to the reproduction position. The servo circuit 5 controls the servo mechanism 6 based on a control signal from the control unit 18, and the servo mechanism 6 moves the optical pickup 3 to a reproduction position. The control unit 18 outputs a control signal to the laser drive circuit 15 and
Drives the semiconductor laser by setting the power of the semiconductor laser in the optical pickup 3 to the power for reproduction. The optical pickup 3 irradiates the magneto-optical recording medium 1 with a laser beam set to a reproducing power and detects reflected light to detect moving image data that has already been recorded. Output to 4. The reproduction signal amplifying circuit 4 outputs the transmitted reproduction signal of the moving image data to the shaper 9, which removes noise from the transmitted reproduction signal and outputs the signal to the decoder 19. The decoder 10 demodulates the reproduction signal transmitted in synchronization with the synchronization signal from the synchronization signal generation circuit 8 and outputs the reproduction data to the external output device 16. This allows the user to view the already recorded moving image. If the optical pickup 3 detects the reproduction signal, the servo mechanism 6 moves the optical pickup 3 to the original recording position and performs the recording operation of the next moving image data.

By repeating the above operations, the operation of recording moving image data and the operation of reproducing already recorded moving image data can be performed. In the present application, the recording means includes the encoder 11, the memory 12, the timing setting circuit 13, the magnetic head driving circuit 14, the laser driving circuit 15, the magnetic head 2, and the optical pickup 3. The optical pickup 3, the laser driving circuit 15, Reproduction signal amplification circuit 4, servo mechanism 6, servo circuit 5, shaper 9, decoder 1
0 is referred to as a reproducing means, and the control section 18 and the operation buttons 19 are referred to as a control means.

[0021]

[Brief description of the drawings]

FIG. 1 is a block diagram of an information recording / reproducing apparatus.

FIG. 2 is a diagram illustrating the features of the present invention.

FIG. 3 is a diagram illustrating timings of recording and reproduction.

FIG. 4 is a diagram showing a time chart of a recording operation and a reproducing operation.

FIG. 5 is a diagram illustrating the movement of the optical pickup when performing a recording operation and a reproducing operation in parallel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Magneto-optical recording medium 2 ... Magnetic head 3 ... Optical pickup 4 ... Reproduction signal amplification circuit 5 ... Servo circuit 6 ... Servo mechanism 7 ... Spindle motor 8 ... Synchronization signal generation circuit 9 ... Shaper 10 ... Decoder 11 ... Encoder 12 ... Memory 13 ... Modulation circuit 14 ... Magnetic head drive circuit 15 ... Laser drive circuit 16 ... Monitor 17 Input means 18 Control unit 19 Operation buttons

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-111629 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 5/76-5/956 G11B 20 / 10-20/12

Claims (3)

(57) [Claims] 1. An information recording / reproducing apparatus which records an image on a medium and reproduces the recorded image, wherein the moving image data formed by encoding the recorded image by a predetermined method is recorded on the medium. Recording means, reproducing means for reproducing moving image data recorded on the medium, and, based on an input signal, moving image data recorded by the recording means while continuing the recording operation by the recording means. and control means for controlling said recording means and said reproducing means to reproduce by the reproducing means, further, the control means, the n-th by said recording means
The moving image data is recorded, and the (n + 1) th moving image data is recorded.
By the recording means before the recording
Playback of the m-th video data already recorded by
Controlling the recording means and the reproducing means as described above.
An information recording / reproducing apparatus characterized by the above-mentioned. 2. The recording device according to claim 1 , wherein
The optical means included in the recording / reproducing means,
Recording position and the moving image recorded by the recording means.
The optical system is configured to alternately move the data reproduction position.
2. The method according to claim 1, wherein the servo circuit is controlled.
An information recording / reproducing device according to the above. 3. The control device according to claim 1, wherein the control means is a moving image specified by a standard.
N-th moving image determined from the average rate of image data
Of (n + 1) th moving image data from the start of recording
Perform recording and playback operations within the time before recording starts
Controlling the recording means and the reproducing means as described above.
2. The information recording / reproducing apparatus according to claim 1, wherein: