JP3239021B2 - Disk recording and playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording / reproducing apparatus which comprises recording means and reproducing means independently of each other, and which can simultaneously perform recording and reproducing operations by both means.

[0002]

2. Description of the Related Art Conventionally, as a disk recording and reproducing apparatus,
As the recording / reproducing means, it is common to use a common optical pickup or a magnetic head which is used for both recording and reproduction. This common recording / reproducing means is used by switching as a recording means during recording and as a reproducing means during reproduction. Was.

In a disk recording / reproducing apparatus having such a mechanism, while recording information on a disk, reproducing information recorded on the disk, or reproducing information,
It was impossible to record other information on the disc.

For example, when a recording start time and a recording end time are set, the recording / reproducing means is dedicated to recording during the set time, so that the recording operation is performed until the set recording end time and at the same time. The recorded information could not be reproduced.

On the other hand, Japanese Patent Application Laid-Open No. 1-176383 discloses recording means including its own servo system and reproducing means also including its own servo system, and independently controlling each of them. An apparatus capable of simultaneously recording and reproducing information in a CAV (constant angular velocity) method or a CLV (constant linear velocity) method is disclosed.

[0006]

However, the above-mentioned conventional disk recording / reproducing apparatus can perform recording and reproducing operations simultaneously by independently providing the recording means and the reproducing means. While watching in real time, after an arbitrary interruption period, it was not possible to reproduce from the point of interruption.

Further, in the CLV system, when the reproducing operation is performed from the inside of the disk following the recording operation on the disk, the positions of the recording means and the reproducing means in the disk radial direction are different. When the CLV control corresponding to recording is performed, normal reproduction CLV control cannot be performed, and a normal reproduction image cannot be obtained.

[0008]

In order to solve the above-mentioned problems, the present invention provides recording means for recording information on a disc, reproducing means for reproducing information from the disc,
Control means for controlling the rotation speed of the disc; and address holding means for holding an address indicating a recording position of the recording means or a reproduction position of the reproducing means at that time in response to a pause operation, In the disc recording / reproducing apparatus which starts reproducing information from the address position held by the address holding means in response to the release operation of the pause, the information held by the address holding means in response to the pause release operation When reproduction of information is started from an address position, the reproduction is performed at a speed higher than usual.

[0009]

[0010]

[0011]

[0012]

According to the present invention, after the pause is released, the information recorded on the disk is reproduced from the address position held by the address holding means. Therefore,
When watching a TV program or the like in real time, if the address holding unit holds the current recording position in response to the pause operation, the reproduction is started from the interruption point of the program after the pause operation is released. Can be.

Further, in the case where the CLV system is used, when the recording and reproducing operations are performed simultaneously, the rotation of the disk is controlled based on the reproducing position of the reproducing means. Can be obtained.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a disk recording / reproducing apparatus according to the present invention will be described with reference to the drawings.

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

First, the configuration of the recording system will be described.

VHF band or U received by the receiving antenna
A signal of a desired channel is selected by the tuner circuit 1 from the high frequency signal of the HF band television. Then, after separating the signal of the selected channel into an audio component and a video component, each is separated into an intermediate frequency signal (a video signal is 58.
75 MHz, and the audio signal is converted to 54.25 MHz).

Next, the analog video signal is converted into a digital signal by the video A / D converter 2b,
The G encoder 3 performs encoding according to the MPEG1 standard which is an international standard for encoding moving images. According to the MPEG1 standard, for example, in the case of supporting an NTSC television, data having 352 × 240 pixels is reproduced at a frame frequency of 29.97 Hz.

On the other hand, the analog audio signal is converted by an audio A / D conversion circuit 2a into a sampling frequency of 4
The signal is converted into a 4.1 kHz digital signal, and is encoded by the MPEG encoder 3 in accordance with the layer 1 method of the MPEG1 standard.

At this time, the sector of the MPEG1 video signal
The format is 2324 bytes (of which, the video data is 2296 bytes) corresponding to a user data area of one sector of the CD-ROM, and one pack is constituted. Also, the sector format of MPEG1 audio data is 2324 bytes (of which the audio data is 2279 bytes) of 1 so that it is basically the same as video.
The pack is configured.

Next, the encoded video signal and audio signal are converted by the CD-ROM encoder 4 into 12 bits as a synchronization signal, 4 bits as a header,
8 bits are added as a subheader and 4 bits are added as an error detection code to make 2352 bytes.
One sector of the M format is formed. Note that data other than the synchronization signal is subjected to scramble processing in each sector.

The two signals thus formatted in the CD-ROM format are sequentially stored in the buffer memory 5. The operation of the buffer memory 5 will be described later in detail.

The data read from the buffer memory 5 is divided by the CD encoder 6 into 98 pieces for each frame. A synchronization signal, a subcode signal, and redundant bits for CIRC processing are added to each of the 98 divided data, and interleaving processing is performed. Further, EFM modulation is performed to form data in a frame unit of a CD format suitable for recording.

Finally, the CD-formatted data is sequentially recorded on the disk 8 by the recording means 7.

Next, the configuration of the reproducing system will be described.

The signal read from the disk by the reproducing means 12 is shaped by a preamplifier circuit provided in the reproducing means 12 itself.

The signal whose waveform has been shaped is supplied to a CD decoder 13.
Performs EFM demodulation, deinterleaving, and CIRC error detection / correction processing, and reproduces data in frame units. Further, 98 frames are collected to form data in sector units. Further, the CD decoder 13 gives a speed detection signal of the spindle motor 9 to the control means 10 from the frequency variation of the synchronization signal reproduced from the disk 8.
Thereby, the control means 10 can recognize the rotation speed of the spindle motor 9.

The data in the unit of frame is a CD-RO
The scrambling performed in each sector is released by the M decoder 14, and error detection and correction are performed again.

Then, the MPEG decoder 15 separates and decodes the audio data and the video data, respectively.
Further, the audio data is stored in an audio D / A converter 16.
a, The video data is converted into analog data by a video D / A converter 16b.

The D / A-converted audio data is input from an audio input terminal of the television 17, and the D / A-converted video data is input from a video terminal, whereby the audio and video data are reproduced on the television 17. You.

Next, the operation of the present invention will be described. The following description is for the case where data is recorded by the CLV method.

A case will be described in which the viewer watches the television program in real time, after an arbitrary interruption period, watches the television program again from the point of interruption.

First, when watching a television broadcast or the like in real time (hereinafter referred to as a real time mode), a television high-frequency signal received by an antenna is directly input to the television 17 without passing through the disk recording / reproducing apparatus of the present invention. The usual method of listening to is used. On the other hand, the signal received by the antenna is also input to the disk recording / reproducing device at the same time, where the data is recorded on the recordable / erasable disk 8.

When a pause is instructed in the real-time mode, the signal input from the antenna to the television 17 is cut off by the switch 18. However, the recording / reproducing apparatus continues to record on the disk.
At the same time, the address indicating the position of the recording unit 7 at the time when the pause is instructed is held by the address holding unit 11.

When a pause release instruction is issued after the elapse of a desired time, the reading means 12 starts reading signals from the address position on the disk held by the address holding means 11. Then, the spindle motor 9, which had been rotationally controlled so that the disk 8 rotates at a constant linear velocity based on the position of the recording means 7 until then, releases the disk 8 based on the position of the reproducing means 12 after releasing the pause. The rotation is controlled to rotate at a constant speed. Therefore, a normal image is reproduced. At this time, since the disk 8 does not have a constant linear velocity with respect to the position of the recording means 7,
The record after the pause is released is an intermittent record.

That is, since the reproducing means 12 reproduces the signal already recorded by the recording means 7 from the inside of the disc, the disc must be rotated at a speed corresponding to the reproducing means 12 at the latest at the latest. , Outer recording means 7
Therefore, the rotation speed of the disk 8 becomes higher than usual, compared with the case where only the recording operation is performed. Therefore, the recording after the pause release is intermittent.

The rotation speed of the spindle motor 9 for rotating the disk is controlled by a control means 10 including a clock generation circuit capable of generating an arbitrary clock, by using address information indicating the positions of the recording means 7 and the reproducing means 12. Is controlled based on the

Next, control of the buffer memory 5 will be described. In the real-time mode, since only a recording operation is performed, data may be continuously read from the buffer memory 5 and recorded on the disk 8 based on a clock having a constant frequency, that is, at a constant speed.

However, as described above, if the pause operation is performed while watching the television program in the real-time mode, and then the pause operation is released, the recording operation is performed while the disk rotation control of the reproduction priority is performed. Therefore, the linear velocity of the recording means 7 with respect to the disk 8 is higher than in the normal case. Therefore, data is read from the buffer memory 5 at a speed higher than the normal reading speed,
It is necessary to record on the disk 8.

Since the speed of reading data from the buffer memory 5 is increased as described above, the speed of reading data from the buffer memory 5 is higher than the speed of writing data to the buffer memory 5. The read operation becomes intermittent. Therefore, the capacity of the buffer memory 5 requires at least a processing unit for intermittent reading, for example, 2352 bytes if it is one sector. However, in actuality, in order to absorb fluctuations in data transfer time, etc. , Several hundred Kbytes or more. Therefore, in this embodiment, two 128-Kbyte RAMs are alternately used.

Further, as for the read clock, since the read speed may be higher than the normal case as described above, a clock corresponding to the disk rotation speed is obtained from the control means 10.

The read clock frequency higher than the normal clock is set to a predetermined clock frequency by the control means 10 by setting the ratio of the rotational speed corresponding to the position of the reproducing means 12 to the rotational speed corresponding to the position of the recording means 7 to a predetermined clock frequency. It can be calculated by multiplying.

In the above description, in the real-time mode, that is, when only the recording operation is performed on the disk, the disk rotation control at a constant linear velocity corresponding to the position of the recording means 7 is performed, and the pause is released. In the case where recording and reproduction are simultaneously performed later, the disk rotation control is performed at a constant linear velocity corresponding to the position of the reproduction means 12.

The rotational speed of the disk 8 is controlled so as to obtain a predetermined linear velocity when the recording means 7 is located at the innermost periphery of the disk 8. That is, the rotation may be controlled at a constant angular velocity.

In this case, the read clock of the buffer memory 5 when recording data on the disk 8 may be controlled based only on the address indicating the position of the recording means 7, and as described above, It is not necessary to perform control based on both the positions of the reproduction means 12 and the reproduction means 12, which is convenient.

In the above description, the pause operation is performed in the real-time mode, and after the pause is released, the data recorded on the disk 8 is reproduced at a normal speed.
During this playback, the data recorded on the disk 8 is fast-forward-reproduced by using an operation such as fast-forward, and when the reproduced data catches up in real time, the reproduction of the data from the disk 8 is stopped and the switch 18 Is turned on, the television signal from the antenna is displayed on the television screen, and it is possible to return to the real-time mode again.

When the pause operation is performed while the data recorded on the disk 8 is being reproduced after the recording operation has been completed, the address indicating the position of the reproducing means 12 is stored in the address holding means 11. Of course, it is held.

In the above description, the pause operation is performed by the pause operation setting means included in the control means 10, and the pause release operation is subsequently performed by operating the pause operation setting means again.

Further, the recording means 7 and the reproducing means 12 can use an optical recording method, a magnetic recording method, a magneto-optical recording method, or the like.

[0050]

As described above, according to the disk recording / reproducing apparatus of the present invention, the program displayed on the television screen in real time can be continuously displayed on the television screen even after an arbitrary interruption period has elapsed. Can be displayed. Therefore, even during the continuation of the recording operation, the contents of the interruption period can be displayed without missing parts.

When the reproduction is performed later than the real time, the unnecessary portion or the entire reproduced image can be caught in real time by fast-forwarding.

Further, in the CLV system, the rotation of the disk is controlled based on the position of the reproducing means prior to the position of the recording means, so that normal speed reproduction can be performed even during the recording operation. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing a disk recording / reproducing apparatus of the present invention.

[Explanation of symbols]

 5: Buffer memory 7: Recording means 10: Control means 11: Address holding means 12: Reproduction means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 20/10 H04N 5/78

Claims (1)

(57) [Claims] 1. Recording means for recording information on a disc, reproducing means for reproducing information from the disc,
Control means for controlling the rotation speed of the disc; and address holding means for holding an address indicating a recording position of the recording means or a reproduction position of the reproducing means at that time in response to the pause operation, A disk recording / reproducing apparatus which starts reproduction of information from an address position held by the address holding means in response to a release operation of the pause, wherein the data held by the address holding means in response to the pause release operation A disk recording / reproducing apparatus for reproducing information at a higher speed than usual when starting reproduction of information from an address position.