JP3835482B2 - Video signal recording and playback device - Google Patents

Description

  The present invention relates to a video signal recording / reproducing apparatus using a disk device capable of reproducing while recording video.

  Conventionally, a VTR is used as a home recording apparatus. In this VTR, as is well known, a broadcast program transmitted by a broadcasting station is received and recorded via an antenna, and is reproduced after this recording. That is, once the recording of a predetermined program is completed, a tape rewinding operation is performed to reproduce and view the received / recorded program.

  In the current VTR, it is impossible to perform recording and playback at the same time. For example, a broadcast program starting at 10:00 and ending at 12:00 cannot be reproduced and viewed from the beginning of the broadcast program from 11:00 while receiving and recording with one VTR. Moreover, it is impossible to perform special playback such as fast-forward playback and reverse playback of the recorded part while receiving and recording a broadcast program. This is a technique used in live broadcasting currently being carried out at a broadcasting station, and in an operation called chasing playback, video transmitted to the station is transmitted in a near real time with a slight time delay. However, in this case, a plurality of VTRs are used, or recording and simultaneous reproduction are performed on an optical disk in which a recording head and a reproducing head are separately mounted. Therefore, a plurality of VTRs are necessary. There is a problem that a special optical disk device is required, and the operation becomes troublesome and costly.

  It is an object of the present invention to provide a video signal recording / reproducing apparatus that can simultaneously reproduce a television signal while recording it.

  In order to achieve the above object, a video signal recording / reproducing apparatus of the present invention comprises an input means for inputting a video signal, a time axis compression means for performing a time axis compression operation on the video signal, and the time axis compression means. Writing means for writing the time-axis compressed video signal obtained as an output to the hard disk via a magnetic head, and reading means for reading the written time-axis compressed video signal from the hard disk via the same magnetic head as described above, A time axis expansion means for restoring the read time axis compressed video signal to the original video signal, and a means for outputting the time axis expanded video signal, and simultaneously writing the input video signal to the hard disk In a video signal recording / reproducing apparatus characterized in that the video signal recorded on the video signal is read out. Means for recording, and further comprising a control means for catch up to the current time with the recording time of the reproduced video signal by the high-speed reproduction.

  According to the present invention, a general-purpose hard disk device can be used to broadcast a broadcast program without using a plurality of VTRs or using an expensive optical disk in which a recording head and a reproducing head are separately mounted. It is possible to realize an apparatus capable of performing normal reproduction and special reproduction such as fast forward reproduction and reverse reproduction while receiving and recording. As a result, it is possible to start viewing the recorded program without waiting for the program to end as in the case of recording / playback by one VTR. Further, even when viewing is started after a long delay from the initial broadcast start time, the use of fast forward playback in the middle can complete the viewing almost simultaneously with the end of the broadcast. In addition, if the user sits down while watching the program, even if the program continues when viewing is resumed, the recording can be continued and the playback can be auditioned from the interrupted scene. Furthermore, by recording the back program, it is possible to immediately start viewing from the start of the back program at the timing after the end of the front program and before the end of the back program.

  According to the present invention, with the configuration described above, an apparatus capable of performing special playback such as fast-forward playback and reverse playback as a recording-independent operation while receiving a broadcast program, recording it after compression encoding, and recording it. Can be realized. As a result, it is possible to start viewing the recorded program without waiting for the program to end as in the case of recording / playback by one VTR. Further, even when viewing is started after a long delay from the initial broadcast start time, viewing can be completed almost simultaneously with the end of the broadcast by using fast forward playback along the way.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing a first embodiment of the present invention. 1 is an antenna, 2 is a tuner, 3 is a demodulator, 4 is an MPEG1 encoder, 5 and 6 are recording buffer memories, 7 is a first switch, 8 is a hard disk device, 9 and 10 are reproduction buffer memories, and 11 is The second switch, 12 is an MPEG decoder, 13 is a television monitor, 14 is a hard disk controller, 15 is a table RAM, 16 is a system controller, 17 is a timer, and 18 is an operation panel.

  Hereinafter, the operation of this embodiment will be described with reference to FIG. 1, but before that, the concept of operation will be described with reference to FIG. In this embodiment, as shown in FIG. 2, it is assumed that the viewer desires to watch a broadcast program broadcast from 10:00 to 12:00 (FIG. 2A). However, for some reason, it is assumed that the viewer can view only after 11:00. In this case, according to the present embodiment, while recording from 10:00 to 12:00 ((b) in the figure), playback can be started from the beginning of the program from 11:00 ((c) in the same figure). If the normal playback mode is selected, it ends at 1 am, which is two hours after the start of viewing. Further, as shown in FIG. 4D, since the recorded part can be fast-forwarded, it is possible to end all at a point a little after 12 o'clock when the program actually ends.

  The detailed operation of this embodiment will be described below. The viewer sets the TV channel, recording start time, and recording end time of the program he / she wants to watch in advance on the operation panel 18. For example, assume that a program that starts at 10 pm on 6 channels is set. Then, at 10 o'clock, the system controller 16 sets the tuner 2 to 6 channels based on the information of the timer 17, selects 6 channel radio waves from the radio waves received by the antenna 1, and demodulates them by the demodulator 3.

  This signal can be viewed on the television monitor 13. This received signal is converted into a compressed video signal by the MPEG1 encoder 4 and becomes a bit stream of 1.5 Mbps. This signal is written into the hard disk device 8 via the first and second recording buffer memories 5 and 6 and the first switch 7 having a capacity of 200 Kbytes, for example.

  Details of the operation of this portion will be described later with reference to FIG. The correspondence between the sector information indicating the physical position of the written compressed video signal on the hard disk and the time information at that time is stored in the table RAM 15. This state is maintained until 11 o'clock when the viewer starts viewing. At 11 o'clock, the viewer starts viewing in front of the TV monitor 13. At this time, if it is desired to view the program from the beginning at the scheduled recording time (10 o'clock), a playback button (not shown) on the operation panel 18 may be pressed.

  In this case, as shown in FIG. 2C, the program from 10:00 is reproduced from the beginning at the normal speed from 11:00. When the hard disk controller 14 controls based on the information in the table RAM 15, the compressed video signal recorded in the hard disk device 8 is reproduced via the reproduction buffer memories 9 and 10 and the second switch 11. Detailed operation of this part will be described later with reference to FIG. The reproduced compressed video signal is decoded by the MPEG1 decoder 12 to become a video signal. This is displayed on the television monitor 13.

  During this time, the compressed video signal compressed by the MPEG1 encoder 4 continues to be written to the hard disk device 8 until 12:00 via the recording buffer memories 5 and 6 and the first switch 7. At 12 o'clock, the system controller 16 finishes recording on the hard disk device 8 based on the information from the timer 17. The video signal written at this time can also be viewed on the television monitor 13 by means such as screen division simultaneously with the reproduced video signal.

  On the other hand, the playback operation can be performed slowly from the viewer's operation panel 18 according to the command from the system controller 16 so as to slowly see the portion that the user wants to see in detail or skip the unnecessary portion. Correspondence between the sector information recorded in the compressed video signal on the hard disk necessary for these and the time information is stored in the table RAM 15.

  The format of this table is shown in FIG. In the figure, 19 is time information indicated by a time code, and 20 is a hard disk sector number. In this example, since consecutive sectors are used every second, sector addresses are shown every other second. Based on this time information, the hard disk controller 14 reproduces a necessary video signal in accordance with the operation of the viewer.

  By the way, in MPEG1, image compression is normally performed with a plurality of frames as one unit, and the concept of GOP (Group of Picture) is used as the unit. For example, when 1 GOP = 15 frames, 1 GOP corresponds to a video for 0.5 seconds. Therefore, in the case of fast-forward playback or slow playback, if the video decoded in GOP units is thinned out and interpolated in GOP units, the motion will not be smooth. In order to make the movement smooth, it is necessary to perform thinning out and interpolation in units of frames.

  That is, in the case of 10 times fast-forward playback, it can be realized by playing back at a rate of 1 frame out of 10 frames, and in the case of 1/10 slow playback, it is possible to display the same frame 10 times continuously It is.

  The time difference between the time when the currently reproduced video screen is recorded and the current time is obtained by using the time information from the table RAM 15 to obtain the recording time and subtracting the recording time and the current time from each other. It can be calculated and monitored by displaying it on the television monitor 13. Any part can be reproduced until this time difference becomes zero. It is also possible to display both times simultaneously on the television monitor 13 by dividing the screen of both the output of the demodulator 3 and the output of the MPEG1 decoder 12. In this way, the currently broadcast video and the video being played can be viewed simultaneously.

  If the hard disk device has a capacity of 2 hours for the compressed image signal, if the viewing is not started within 2 hours from the start of recording, the signal is updated at that time, so that it is always 2 hours from the start of viewing. It can cover up to the previous broadcast. It is also possible to set a mode for canceling the update. In this case, it is possible to record for 2 hours as in a normal VTR.

  The details of the timing related to the peripheral hardware of the hard disk 8 will be described below with reference to FIG.

  Although the details of the hard disk device are omitted in FIG. 1, it is a general-purpose device as a peripheral device of a computer system, and the disk medium may be composed of one or several disks, and the possessed head is for recording only. The head is not used exclusively for playback but for recording and playback.

  4A shows the MPEG1 encoder output, A1, A2, A3,... Are signals divided by 1.5 M bits, and FIG. 4B is an operation mode of the 200 Kbyte recording buffer memory 5. , W means writing to the memory, and R means reading from the memory. Thus, for example, A1-W means writing the A1 signal to the buffer memory, and A1-R means reading the A1 signal from the buffer memory. Writing to the buffer memory is performed in real time with the video signal, and reading is performed at high speed in accordance with the transfer speed to the hard disk device 8.

  FIG. 4C shows an operation mode of the 200 Kbyte recording buffer memory 6, and W and R mean the same as in FIG. The buffer memory 5 and the buffer memory 6 are paired with each other. While one of them is transferring data to the hard disk via the first switch 7, the other stores the compressed video signal from the MPEG1 encoder 4. Yes.

  (D) shows the seek timing for writing to the hard disk device 8. (E) shows the timing for transferring and writing data from the buffer memory 5 or 6 to the hard disk device 8. A1-W means that the signal of A1 is written to the hard disk. In the figure, it is difficult to understand the timing relationship, but since the relationship read by A1-R in (b) is written in A1-W in (e), the cases of (b) and (c) are only used. Precedes (e).

  (F) shows the seek timing for reading from the hard disk. (G) shows the read timing from the hard disk, and B1-R means that the B1 signal is read from the hard disk. (H) shows the operation mode of the 200 Kbyte reproducing buffer memory 9, and B1-W means that the B1 signal is written into the buffer memory 9.

  (I) shows the operation mode of the 200 Kbyte reproducing buffer memory 10, and W and R are the same as those described above. The buffer memories 9 and 10 are paired with each other. While one of the signals read from the hard disk device 8 is written, the other reads the stored signal from the hard disk device 8 at the speed of the video signal, It works to send to the MPEG1 decoder 12 via the switch 11.

  (J) indicates an input to the MPEG1 decoder 12. As can be seen from the figure, it is extended in the same cycle as (a) and is reproduced without interruption.

  As can be seen from the figure, the period of A1, A2, A3... Is such that T = (seek time for recording on the hard disk) + (of the above period) It is set to be larger than (time required for writing data to the hard disk) + (seek for reproduction) + (reading time of data of the above-mentioned period from the hard disk).

  If the sum of the times becomes larger than the period of A1, A2, A3,..., The video is overflowed without being recorded. Therefore, the period must be sufficiently larger than the total time. In particular, the seek time of a hard disk varies greatly depending on the case, so it is necessary to allow for the maximum seek time.

  Here, the period of A1, A2, A3,... Is the time for which the 200-kbyte buffer memory occupies the 1.5 Mbps MPEG bit stream, and 200 k ÷ (1.5 M ÷ 8) = about 1 second. If the data transfer rate of the hard disk is 1 Mbyte / sec, the time required for data transfer is 200 k ÷ 1 M = 0.2 sec. T = 0.1 + 0.2 + 0.1 + 0 even if the maximum seek time is assumed to be 100 ms. .2 = 0.6 seconds <1 second and a sufficient margin time is obtained.

  As described above, according to the video signal recording / reproducing apparatus of the present invention, a video signal recording / reproducing apparatus using a hard disk can be realized, which can simultaneously record and reproduce on different parts of the same hard disk. . Accordingly, it is possible to realize an apparatus capable of performing special playback such as fast-forward playback and reverse playback of a recorded portion while receiving and recording a broadcast program.

  As a result, it is possible to start viewing the recorded program without waiting for the program to end as in the case of recording / playback by one VTR. In addition, even when viewing starts after a long delay from the initial broadcast start time, by using fast-forward playback in the middle of playback, viewing can be completed almost simultaneously with the end of the broadcast. be able to.

  Further, although omitted in FIG. 1, the audio attached to the video can be handled in exactly the same way as the video, and the description regarding “video” in this embodiment can be directly replaced with “video and audio”. .

  In order to extend the life of the hard disk, the hard disk can be written only when necessary while watching a TV program. In this case, recording starts when the viewer presses the command button. In this case, the operation panel 18 is provided with a recording start button and a reproduction start button. These can also be used together. This function is effective when viewing must be interrupted for some reason while viewing a television program. For example, if it is necessary to interrupt viewing such as responding to a visitor, answering a call, bathing, eating, etc. during the program, press the start recording button to record the program from that point and finish When the playback start button is pressed, the recorded program is played back, so that the user can audition without missing the program from the recording start time. In addition, by providing an end setting button that allows you to easily set the recording end time, even if there is a sudden outing when the return time is not clear, the viewer can record only the time that the viewer wants. Can go out. The end setting button at this time is, for example, that the recording time can be set by the number of times the button is pressed, such as 30 minutes when the button is pressed once, 1 hour when the button is pressed twice, and recording of the currently viewed program. Very simple and effective for viewers.

  Needless to say, since the recording is continued during the reproduction, the program broadcast during the reproduction can be auditioned without overlooking.

  1 is provided with a television signal detection circuit (not shown) for detecting whether or not television broadcasting is being performed. For example, this television signal detection circuit does not need to be added with a new circuit if a synchronization signal detection circuit usually mounted on an existing television receiver is used. Hereinafter, a specific example in which a synchronization signal detection circuit is used as the television signal detection circuit will be described.

  First, it is determined whether or not there is a synchronization signal in the demodulated video signal. If there is no synchronization signal in the demodulated video signal, it is determined that it is outside the broadcast time, and writing to the hard disk device is prohibited. If the writing operation has already been performed on the hard disk device, the writing to the hard disk is temporarily stopped when the synchronization signal is not detected, and the writing is resumed when the synchronization signal is detected again. Thereby, it is not necessary to record unnecessary time (for example, time such as midnight when broadcasting is not performed), and the life of the hard disk device can be maintained. This saves unnecessary operations such as recording a time zone when there is no late-night television broadcast when the recording capacity of the hard disk drive will become large in the future and it will be possible to record television images up to 24 hours in advance. It is effective for. Since the synchronization signal detection circuit is an existing technology and known, its detailed description is omitted. Generally, a synchronization signal obtained from a known synchronization signal separation circuit is integrated, and its DC level is normal. And a method for determining whether the frequency of the synchronization signal is a predetermined value (for example, the frequency of the horizontal synchronization signal is 15.73 KHz in the NTSC method). .

  In this embodiment, the synchronization signal detection circuit is used as the television signal detection circuit. However, when the broadcasting format is digital broadcasting, a method for determining whether or not an error signal of an error signal detection circuit used for clock reproduction such as PLL is at a predetermined level, or error detection for error correction of a transmission signal A method for determining whether or not the amount of the error flag output from the circuit is at a predetermined level can be mentioned.

  Of course, recording is always performed, a signal is given by operating the button when viewing is interrupted, and the time, address, etc. are stored, so that when the playback start button is pressed when viewing is resumed, playback can be traced back when viewing is suspended. Conceivable.

  Furthermore, although omitted in FIG. 1, if the second tuner and the second demodulator are provided and the channel to be viewed and the channel to be recorded are specified independently, while the first program to be recorded is being viewed, When a second program to be viewed on another channel starts, recording of the second program on another channel is started, and when the first program being viewed ends, the second program is started from the beginning. You can audition.

  The second embodiment of the present invention will be described below. It should be noted that the drawings for explaining the second embodiment are not particularly used. The basic configuration is the same as in FIG.

  The configuration of the present embodiment further includes means for inputting video / audio other than broadcasting, for example, means for inputting a reproduction signal of a VTR. It is also possible to use a substitute for an alarm clock by storing broadcast or a favorite video / audio input from here on the hard disk 8 for about 10 seconds and automatically reproducing it every morning at a predetermined time. Thereby, a comfortable awakening can be obtained.

  In this case, the volume needs to be automatically switched to a sufficient volume regardless of the setting value of the previous day. Further, a voice recognition circuit is provided in addition to the configuration of FIG. 1 to recognize an alarm sound of another alarm clock instead of the clock in the system and reproduce a predetermined image together with the sound, or not an alarm By recognizing the voice of “I'm right” when returning home, it is possible to read out from the hard disk 8 and reproduce a predetermined video.

  Furthermore, it is troublesome for the user to specify the desired video / audio, but by recording and distributing the compressed video / audio on an inexpensive medium such as a floppy disk or CD-ROM. , To record on the hard disk through the above-mentioned medium reader connected to this device and play it at a fixed time every morning, so that a wake-up call of a specific actor can be obtained, etc. It is also effective as a tool.

  The third embodiment of the present invention will be described below. In this embodiment, in FIG. 1, the hard disk device 8 has at least two recording areas, and the first recording area is an area for recording a video signal received from the tuner 2, and the functions described in the second embodiment. This is a recording area used for realizing the above. The second recording area is an area for storing video data arbitrarily extracted by the viewer from the video data recorded in the first recording area. As a result, information transmitted by television broadcasting while the viewer is viewing can be selectively stored in the second recording area.

  For example, in a travel program that is frequently broadcast in recent years, the location of the inn, contact information, etc. are displayed on the screen, and only the scenes that introduce the contents of dishes and services, etc. are saved in the second recording area. It is possible to store information more accurately without requiring the user to take notes. Further, by adding a file name to the video data taken out by the viewer and storing it in a predetermined directory, it is possible to perform the search more easily when the viewer searches for a desired file at a later date.

  For example, more specifically, the second recording area of the hard disk is divided in advance into directories such as restaurants, trips, and inns, and further divided into cooking inns and hot spring inns under a directory called inns. The viewer performs an operation of designating the start point and end point of video data to be saved during viewing, and then selects which directory the extracted data corresponds to. Thus, the video data is automatically saved in the selected directory. The viewer can search by selecting a desired directory and selecting a file name when searching at a later date. In addition, an external output terminal such as a SCSI interface is provided on the hard disk device, and the stored video data is stored in an external recording device such as a floppy (registered trademark) disk drive or PD drive, thereby creating a database unique to the viewer. Can be produced.

  In this embodiment, for simplicity of explanation, the hard disk device is divided into two recording areas. However, whether the video data recorded in the hard disk is automatically updated data, Alternatively, there may be a means for designating whether the data is not updated if there is no operation by the viewer. For example, the type of recording data, sector information, etc. are recorded in the table RAM 15 shown in FIG. 1, and the hard disk controller 14 identifies whether each sector can be updated based on the information and controls the hard disk device. The method is raised.

  The fourth embodiment of the present invention will be described below with reference to FIG. In FIG. 5, since 1 to 18 are the same as those described in the first embodiment, the description thereof is omitted. 19 to 26 correspond to 4 to 7 and 9 to 12 in FIG. In FIG. 5R> 5, 27 is a frame decimation circuit, 28 is a frame interpolation circuit, and 29 is a third switch.

  The hard disk device 8 has at least two recording areas. The first recording area is an area for recording a video signal received from the tuner 2, and is a recording area used for realizing the function described in the first embodiment. is there. If the first recording area has, for example, a recording capacity of 2 hours for the compressed video signal, the previously recorded video data is updated from the beginning if viewing does not start within 2 hours from the start of recording. Thus, it has already been described in the first embodiment that normal video can be viewed from the start of viewing to broadcasting within 2 hours.

  In the present embodiment, when the video data is updated, the previously recorded video data is once read, and the decoder 26 decodes the original video signal through the buffer memories 23 and 24. Then, the frame thinning circuit 27 performs a frame thinning process on the video signal to reduce data. Then, the encoder 19 again compresses the image of the output of the frame thinning circuit 27. The frame-thinned compressed video signal obtained in this way is stored in the second recording area. Depending on the method of thinning out the frames, for example, if one frame is extracted and compressed, 4 times the recording time for recording a normal compressed video signal is secured with the same recording capacity. it can. In other words, if the viewer is a hard disk device having a recording capacity of 2.5 hours for normal recording, the first recording area is broadcast for 2 hours and the second recording area for 2 hours until a total of 4 hours before broadcasting. You can go back and check the contents. This allows viewers to check more program content with a smaller recording capacity, and to meet the demands of viewers for longer recording time while reducing the required recording capacity of the hard disk device. it can.

  As a matter of course, the audio signal to be recorded in the second recording area is normally recorded without performing the thinning operation in units of frames. Further, when the video signal recorded in the second recording area is read and displayed on the television monitor 13, the output of the decoder 12 of FIG. 5 is once inputted to the frame interpolation circuit 28, and the thinned frame is replaced with the same frame. And is displayed on the television monitor 13 via the third switch 29. In this embodiment, the frame thinning method is used to reduce the video data. However, methods such as sub-sampling and color signal removal can be used.

  In this embodiment, for the sake of simplicity of explanation, the hard disk device is divided into two recording areas. However, the video data recorded in the hard disk is data in which a normal video signal is recorded. There may be a means for adding and storing information for determining whether or not the data has been subjected to data reduction such as frame thinning. For example, there is a method in which the type of recording data, sector information, etc. are recorded in the table RAM 15 shown in FIG. 5, and the hard disk controller 14 controls the hard disk device 8 based on the information.

  It is also possible for the viewer to independently set the time for normally recording the video signal and the time for recording by reducing data such as frame thinning. Thereby, the operation more suitable for each viewer is performed.

  The fifth embodiment of the present invention will be described below. In this embodiment, a unique drawing is not used, but the basic configuration is the same as in FIG. 1. In FIG. 1, a plurality of (N) tuners 2 are provided to simultaneously receive a plurality of video signals. Is. N encoders 4 may be provided, or a high-speed type that operates at a normal N-times encoding speed can be used by switching over time.

Further, with respect to the hard disk device 8, N units similar to those in FIG. 1 are used in parallel, or the read / write speed to the hard disk device is increased while keeping one unit as in FIG. By increasing the period of A3, that is, the size of the buffer memory and making the time T _N required for reading and writing the N channel shorter than the above period, the desired one channel while simultaneously writing the N channel video Can be read. By realizing this function, it is possible to select a favorite channel after the end of broadcasting without designating a television channel in advance.

  The sixth embodiment of the present invention will be described below with reference to FIG. In FIG. 6, since 1 to 18 are the same as those described in the first embodiment, description thereof is omitted.

  In FIG. 6, 30 is a screen composition circuit, 31 is a screen separation circuit, and 32 is a pixel interpolation circuit. This embodiment is configured to receive a plurality of video signals simultaneously by providing a plurality of tuners 2 and demodulator 3 (four in the figure). The plurality of received video signals are input to the screen composition circuit 30. In the screen composition circuit 30, after the phase of the synchronizing signal of each video signal is matched by a frame memory (not shown in the figure), the screen size is reduced by pixel thinning, line thinning, etc. As shown in FIG. Composite to the screen. The synthesized video signal is image-compressed by the encoder 4 and recorded in the hard disk device 8 as described in the first embodiment. Further, at the time of reproduction, as shown in FIG. 8, the screen separation circuit 31 extracts only a portion corresponding to a desired channel from the synthesized one screen, and the pixel interpolation circuit 32 performs pixel interpolation and line interpolation to perform a normal operation. The image is enlarged to one screen and displayed on the television monitor 13. As a result, more TV channels can be recorded on the hard disk device 8 having the same recording capacity, and the desired TV channel is set in advance by reading the desired one channel video while simultaneously writing the N channel video. You can watch your favorite channel after broadcast without specifying it. Further, unlike the third embodiment, N-times recording capacity is not required for N-channel recording, which is effective in saving the recording capacity of the hard disk device.

  Of course, the synthesized video signal output from the decoder 12 may be displayed on the television monitor 13 as it is without separating the screen.

  In the above embodiment, the recording format, in particular, the relationship between the GOP unit and the sector unit on the hard disk was not mentioned. However, in consideration of special reproduction such as fast-forwarding, K pieces per GOP It is desirable to use a format that is composed of M GOPs (K and M are integers) per sector, or that a simple relationship such as M GOPs per K sector is established.

  In addition, the hard disk device in the above embodiment is a hard disk device in which the drive part can be detached as currently used as a peripheral device such as a personal computer, so that video data can be backed up or specific video data can be stored. It is possible to use it, etc., and it is more effective.

1 is a block diagram of a video signal recording / reproducing apparatus according to a first embodiment of the present invention. Operation conceptual diagram of the first embodiment Explanatory drawing of contents of table RAM Detailed timing diagram of main hardware Block diagram of a video signal recording / reproducing apparatus according to a fourth embodiment of the present invention. Block diagram of a video signal recording / reproducing apparatus according to a sixth embodiment of the present invention. Explanatory drawing about screen composition in the 6th example of the present invention. Explanatory drawing about screen separation in the 6th example of the present invention

Explanation of symbols

4, 19 MPEG1 encoder 5, 6, 20, 21 Recording buffer memory 8 Hard disk device 9, 10, 23, 24 Playback buffer memory 12, 26 MPEG1 decoder 13 TV monitor 14 Hard disk controller 27 Frame thinning circuit 28 Frame interpolation circuit 30 Screen composition circuit 31 Screen separation circuit 32 Pixel interpolation circuit

Claims (1)

An input means for inputting a video signal, a time axis compression means for performing a time axis compression operation on the video signal, and a time axis compressed video signal obtained as an output of the time axis compression means to a hard disk via a magnetic head A writing means for writing, a reading means for reading the written time-axis compressed video signal from the hard disk via the same magnetic head as described above, and a time axis for restoring the read time-axis compressed video signal to the original video signal In a video signal recording / reproducing apparatus comprising: expansion means; and means for outputting a video signal expanded in time axis, wherein the input video signal is written to a hard disk and at the same time a previously recorded video signal is read out ,
A video signal recording / reproducing apparatus comprising: means for recording information relating to the time when the video signal was recorded; and control means for catching up the recording time of the reproduced video signal to the current time by high speed reproduction.

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