JPH0832003B2 - TV receiver - Google Patents

Description

TECHNICAL FIELD The present invention relates to a television receiver capable of recording / reproducing images.

"Prior Art" Video tape recorders are generally used to record / play back images of television programs and the like. Then, in the case of reproduction, after recording a desired program or the like, the video tape is rewound and reproduced from the recording start point.

[Problems to be Solved by the Invention] By the way, there is a case where it is desired to reproduce a portion recorded a while ago even during recording. However, since the video tape recorder cannot play back during recording, the recording had to be stopped when it was desired to see a part before. On the other hand, when recording a television program or the like, it is often not desirable to interrupt the recording, and in such a case, the desired portion could not be reproduced until after the program was finished.

Further, in the video tape recorder, since rewinding requires a long time, there is a drawback that it takes time to repeatedly reproduce a desired portion.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to perform reproduction of a portion to be viewed just before the present time,
Moreover, it is an object of the present invention to provide a television receiver that does not require time even when the reproduction of a desired portion is repeated.

"Means for Solving the Problems" In the invention according to the first aspect, image data is sequentially written to each track of the optical disc by the first optical head based on the image signal output from the tuner unit, When the writing to the track is completed, the writing processing unit that returns to the first track and repeats the writing, and the image data written on the optical disc from the designated track during the writing According to the order, the second optical head sequentially reads, and when reading from all tracks is completed, a plurality of sets of read processing units are provided, which returns to the first track and repeats the reading, and the plurality of sets of write processing units. And a read processing unit for each of a plurality of surfaces of one or a plurality of optical disks.
It is characterized in that the display is provided in combination and the display based on the output signal of the readout processing section and the display based on the image signal output from the tuner section are selectively selected and performed.

According to the second aspect of the invention, in addition to the above configuration, during the period from the end of writing of the final track of the write processing unit to the start of rewriting on the first track. A semiconductor memory for storing image data corresponding to the image signal, and a read-out of the semiconductor memory between the output of the read signal of the final track and the output of the read signal of the first track by the read processing unit. An output switching unit that outputs the signal in place of the output signal of the read processing unit, and selects display based on the output signal of the read processing unit or the output switching unit and display based on the image signal output from the tuner unit. The feature is that they are selected and performed once.

Further, in the invention described in the third claim, the first
Image data is sequentially written to each track of the optical disk by the first optical head based on the image signal output from the tuner section of the optical disc, and when writing to all tracks is completed, the first track is returned to and the writing is repeated. During the writing, the writing processing unit and the second optical head sequentially read the image data written on the optical disk from the designated track in the writing order, and when the reading from all the tracks is completed, the image data is read again. Corresponding to the image signal between the reading processing unit that returns to the first track and repeats the reading, and from the time point when the writing process unit finishes writing the last track to the time when rewriting is started on the first track. The semiconductor memory for storing the image data to be read, and the period from when the read processing unit outputs the read signal of the final track to when the read signal of the first track is output. An output switching unit for converting the read signal of the semiconductor memory into an output signal of the read processing unit and outputting the read signal, and a second tuner unit are provided, and display based on the output signal of the read processing unit or the output switching unit and the first tuner unit are provided. It is characterized in that the display based on the image signal output from the second tuner unit is selectively selected and performed.

[Operation] In the invention according to the first aspect, since the plurality of writing processing units endlessly write the image signals, a plurality of image signals for a predetermined time from the present time are written on the optical disc. Is always stored. Then, the stored image data is sequentially read by the corresponding plurality of reading processing units from the one corresponding to the desired time.

Further, according to the second aspect of the invention, since image data of a period that cannot be stored in the writing processing unit is written in the semiconductor memory, a temporal discontinuity occurs by using this image data. The image data can be read without the need.

Further, in the invention described in the third claim, the first
The display based on the output signal of the reading processing unit or the output switching unit corresponding to the image signal output by the tuner unit and the display based on the image signal output by the second tuner unit are selectively selected and performed. Therefore, while recording based on the output of the first tuner unit, display based on the image signal output from the second tuner unit can be performed, and the program being recorded can be appropriately time-continuously discontinued. Can be displayed.

"Embodiment" Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, reference numeral 1 is a television tuner which outputs an image / audio signal of a tuned station. This image / sound signal is FM-modulated by the FM modulation circuit 2 and then supplied to the write head drive unit 3. The terminal T1 is a terminal to which a video signal or the like from an external device (video tape recorder, etc.) is supplied, and the signal supplied to this terminal T1 is FM.
It is FM-modulated by the modulation circuit 2 and supplied to the write head drive unit 3. The write head drive unit 3 has the configuration shown in FIG. In the figure, 10 is a drive interface, which synthesizes the FM-modulated audio signal and image signal output from the FM modulation circuit 2 and makes the synthesized signal a limiter waveform by a limiter circuit, and the optical head 11 as write data. Supply to. Further, the drive interface 10 supplies a control command to the system controller 12, and the system controller 12 controls the drive system of the disk based on the supplied command. The optical head 11 controls the irradiation of laser light based on the write data to form pits on the magneto-optical disk 4. The optical head 11 is driven by the feed motor 13 in the radial direction of the magneto-optical disk 4, whereby the tracks on the magneto-optical disk 4 are sequentially traced from the innermost track. The position data of the optical head 11 is fed back to the system controller 12, and a servo control signal is created based on this feedback signal. The servo control signal is supplied to the feed servo circuit 14, and the feed servo circuit 14 controls the rotation of the feed motor 13 based on the servo control signal.
As a result, the optical head 11 accurately traces the track on the magneto-optical disk 4. Further, after the optical head 11 traces the outermost track, the system controller 12 supplies a control signal to the feed servo circuit 14 so as to sequentially trace again from the innermost track. In this way, the optical head 11 is configured to perform endless recording.

Next, the focus / tracking servo circuit 15 is a circuit for performing servo control of focus and tracking of the optical head 11 under the control of the system controller 12.
Reference numeral 16 is a disk motor that rotationally drives the magneto-optical disk 4, and the number of rotations of the disk motor 16 is fed back to the system controller 12. The system controller 12 creates a servo signal based on the fed back rotation speed data and supplies it to the disk servo circuit 17. The disk servo circuit 17 controls the number of rotations of the disk motor 16 based on the supplied servo signal so that the rotation speed of the disk motor 16 becomes a predetermined constant value. The constant rotation control is performed in this manner because it is necessary to write the image data and the like by the optical head 11 at a constant angular velocity. The above is the configuration of the write head drive unit 3.

Next, reference numeral 5 shown in FIG. 1 is a read-out pickup driving unit, and its structure is as shown in FIG. The read pickup drive unit 5 has the same structure as the above-described write head drive unit 3 except that it does not have a disk motor and its drive system.
It corresponds to 15 parts. However, the read pickup driving unit 5 operates only when the read command data is supplied. Further, track instruction data is supplied to the system controller 22, and the initial read position of the optical head 21 is controlled according to the track instruction data. The optical head 21 is controlled so as to sequentially move to the outer track after reaching the track indicated by the track instruction data. In addition, after the data on the outermost track is read, it is controlled to return to the innermost track for reading.

The read command data and the track command data supplied to the system controller 22 are both generated by operating a predetermined operating section (not shown). The signal read by the optical head 21 is supplied to the demodulation circuit 6 shown in FIG. 1 as an output signal of the read pickup driving section 5. The demodulation circuit 6 demodulates the supplied signal and creates an image signal and an audio signal. These signals are supplied to the image receiving unit 7 via the terminal To. The image receiving unit 7 has its own tuner (not shown), and normally displays an image of a television broadcast of a station tuned by this tuner. A video tape recorder 8 is used when storing the output signal of the demodulation circuit 6.

Next, 30 shown in FIG. 1 is a binary data conversion circuit, and FM
This is a circuit that converts the output signal of the modulation circuit into binary data and writes it in the RAM 31. The binary data conversion circuit operates while the optical head 11 of the write head drive unit 3 moves from the outermost track to the innermost track. Also RAM31
Has a capacity capable of storing the output signal of the FM modulation circuit 2 in the period. The data stored in the RAM 31 is read by the read control circuit 32 and supplied to the demodulation circuit 6. The read control circuit 32 is driven while the optical head 21 of the read pickup driving unit 5 moves from the outermost track to the innermost track, and outputs image data for a period not stored in the magneto-optical disk 4. . By the binary data conversion circuit 30, the RAM 31, and the read control circuit 32, the image data is stored and output without interruption. In addition, in FIG. 1, a portion surrounded by a one-dot chain line constitutes a recording / reproducing unit.

Next, the operation of this embodiment having the above configuration will be described.

First, the tuner in the image receiving section 7 and the television tuner 1 are tuned to the same station. At this time, the write head drive unit 3
As described above, since the writing is performed endlessly, the program of the station to which the tuner 1 is tuned is continuously recorded on the magneto-optical disk 4. In this case, since the previous data is erased when the magneto-optical disk 4 is rewritten,
The amount of image information that can be stored in the magneto-optical disk 4 is determined by the size of the disk and the track density. In the example, when a Tb-Fe-Co based magneto-optical disk having a diameter of 30 cm was used, image information could be recorded for about 30 minutes. Also RAM31
As described above, the image data in the period in which the write head drive unit 3 cannot write is sequentially updated and recorded.

Next, when the operation section is operated and the read command data and the track position designation data are supplied to the read pickup drive section 5, the read pickup drive section 5 causes the read pickup drive section 5 to read the magneto-optical disk 4 from the track designated by the track position designation data. Start reading. After that, the read tracks of the read pickup driving unit 5 are sequentially updated, and the read process is continued. In this case, if the read command data is not stopped even after the reading of the image data of the outermost track is completed, the optical head 21 of the read pickup drive unit 5 searches the innermost track and The reading process is restarted from the inner track. Then, while the read pickup driving unit 5 searches for the innermost track, the read control circuit 32 reads the data in the RAM 31. Therefore, the image data output from the demodulation circuit 6 is continuous image data. Then, when the display of the image receiving unit 7 is switched from the signal of the internal tuner to the output signal of the demodulation circuit 6, the image receiving unit 7 performs the display from the image data of the time traced back by the time corresponding to the designated track. As described above, by appropriately reading the data recorded on the magneto-optical disk 4 and the data in the RAM 31, it is possible to instantly see the image up to 30 minutes before the present time.

Therefore, for example, if the broadcast of a 2-hour program has passed 15 minutes, the video tape recorder
The program cannot be viewed from the beginning until 1 hour and 45 minutes have elapsed until the recording is completed, and the time required to finish the program is 3 hours and 45 minutes. According to this, since the viewer can instantly watch the program from the beginning, the time required to finish watching the program is 2 hours, which is the time required for the program.

In the embodiment, one set of the write head drive unit 3 and the read pickup drive unit 5 is provided and recording is performed for any one of the channels, but a plurality of these sets are provided for the plurality of channels. You may comprise so that it may record simultaneously. For example, as shown in FIG.
A write head drive unit 3 and a read pickup drive unit 5 are provided on both sides of each of the magneto-optical disks 4, 4, 4, and further, a television tuner 1, an FM modulation circuit 2, a binary data conversion circuit 30, a RAM 31, The same number of read control circuits 32 are provided. With the above configuration, it is possible to provide a system in which images of any 6 stations in the past 30 minutes are constantly recorded.

Further, in each of the above embodiments, when the image data in the non-recordable period of the write head drive unit 3 is not particularly required, the binary data conversion circuit, the RAM 31, and the read control circuit 32 are not provided, and the configuration is simplified. Good.

Furthermore, in each of the above-described embodiments, the example in which the tuner unique to the image receiving unit 7 is provided is shown, but the present invention is not limited to this.
For example, instead of providing a tuner unique to the image receiving section 7, a changeover switch is provided in front of the terminal To of the recording / reproducing section, and the output signal of each television tuner 1 and the output signal of the demodulation circuit 6 are changed through the changeover switch. You may make it output from the terminal To.

Further, the data to be stored in the magneto-optical disk 4 and the RAM 31 may be compressed and expanded when being read. In this case, there is an advantage that the recording time can be lengthened.

[Advantages of the Invention] As described above, according to the invention described in claim 1, the image data for a plurality of channels can be always recorded for a plurality of channels, the image data being traced back a predetermined time from the present time. It is possible to sequentially display, from the image data of the selected desired channel, data corresponding to the desired time.

According to the second aspect of the present invention, the image data for a period that cannot be stored in the writing storage section can be stored in the semiconductor memory, and the use of this image data causes a temporal discontinuity. It is possible to read and display the image data without the need.

Further, according to the invention described in claim 3, during the recording based on the output of the first tuner section, the display based on the image signal output from the second tuner section can be performed, and the recording is appropriately performed. It is possible to display the programs of without interruption in time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention,
FIG. 2 is a block diagram showing the configurations of the write head drive unit 3 and the read pickup drive unit 5, and FIG. 3 is a block diagram showing a modification of the present embodiment. 3 ... Write head drive section (write processing section), 4 ... Magneto-optical disk (optical disk), 5 ... Read pickup drive section (read processing section), 7 ... Image receiving section, 30 ... Binary data Circuit, 31 ... RAM (semiconductor memory), 32 ... read control circuit (output switching unit).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinji Kato 10-1 Nakazawa-machi, Hamamatsu City, Shizuoka Prefecture Yamaha Stock Company (56) References JP-A 1-285068 (JP, A) JP-A 1-279465 (JP, A) JP 59-141882 (JP, A) JP 63-179675 (JP, A) Actual Kaihei 1-65571 (JP, U) JP-B 49-25204 (JP, B1)

Claims (3)

[Claims] 1. A first optical head sequentially writes image data to each track of an optical disk on the basis of an image signal output from a tuner section, and when writing to all tracks is completed, returns to the first track and writes the image data. And a writing processing section that repeats the above, and during the writing, the image data written on the optical disc is sequentially read by the second optical head according to the writing order from the designated track, and the reading from all the tracks is completed. Then, a plurality of sets of read processing units that return to the first track and repeat the reading are provided, and the plurality of sets of write processing units and read processing units are provided for a plurality of surfaces of one or a plurality of optical disks. One set is provided, and the display based on the output signal of the read-out processing section and the display based on the image signal output from the tuner section are selectively selected and performed. Machine. 2. A first optical head sequentially writes image data to each track of an optical disk based on an image signal output from a tuner section, and when writing to all tracks is completed, the track returns to the first track again. During the writing, the second optical head sequentially reads the image data written on the optical disk from the designated track during the writing, and reads from all the tracks. When finished, the read processing unit returns to the first track again and repeats the reading, and between the end point of writing of the final track of the write processing unit and the start of rewriting on the first track, A semiconductor memory that stores image data corresponding to the image signal; and a read signal for the first track after the read processing unit outputs the read signal for the last track. Between the read processing section and the output switching section for outputting the read signal of the semiconductor memory in place of the output signal of the read processing section. A television receiver characterized by selectively displaying and displaying based on an image signal. 3. The first optical head sequentially writes image data to each track of the optical disk based on the image signal output from the first tuner section, and when writing to all tracks is completed, the track returns to the first track again. And a writing processing unit that repeats the writing, and during the writing, sequentially reads the image data written on the optical disc from a designated track according to the writing order by the second optical head, and from all the tracks. When the reading is completed, the reading processing unit that returns to the starting track again and repeats the reading, and from the time when the writing processing unit finishes writing the final track until the rewriting is started on the first track. In a semiconductor memory for storing image data corresponding to the image signal, and the read processing unit outputs the read signal of the last track and then the read signal of the first track. In the meantime, an output switching unit for converting the read signal of the semiconductor memory into an output signal of the read processing unit and outputting the read signal, and a second tuner unit are provided, and the output of the read processing unit or the output switching unit is provided. A television receiver characterized in that display based on a signal and display based on an image signal output from the second tuner section are selectively selected and performed.