JPS63308758A - Video tape recorder - Google Patents

Abstract

PURPOSE:To execute the control in starting and completing a picture recording for a desired program and to cope with the transfer of a broadcasting time, the change in broadcasting time, etc. by collating with comparison a received video signal and the video signal inside a memory. CONSTITUTION:The video signal to be collated with comparison is subjected to A/D conversion 1 and a converted video signal 101 is stored in a memory 2. On the other hand, a received video signal is subjected to A/D conversion 1, fed to a comparator 3 as a signal 102 and collated by being compared with the video signal 103 read from the memory 2. This compared output signal controls a video control switch 4 and the start and completion of video are executed. At this time, the video signal 103 is controlled by the signal 104 showing the state of the switch 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video tape recorder, and particularly to a video tape recorder having a scheduled recording function.

[Conventional technology]

Conventionally, this type of video tape recorder, as shown in the block diagram in FIG. 3, has a timer 10 and a recording control switch 11 controlled by the output from the timer 10 as a scheduled recording mechanism. ing.

For the timer 10, the recording start time and recording end time are stored and set in advance using the keyboard.
The output from the timer 10 controls the recording control switch 11 to be "on" at the recording start time and to be "off" at the recording end time. In this way, scheduled recording on the video tape recorder is performed.

[Problem that the invention seeks to solve]

The video tape recorder described above is configured so that the recording control switch is turned on and off depending on the time set in the timer, and the start and end times of recording are controlled. Alternatively, recording of a program for which it is unknown whether or not it will be broadcast may fail. For example, when trying to record a subsequent program of a night game broadcast of a professional baseball game, due to the extension of the night game broadcast, the night game broadcast is still being played at the recording start time, and even when the recording end time has come, The program you want to record continues. For this reason, the program may not be completely recorded until it ends. Also,
Even for programs that are broadcast only when a night game broadcast is cancelled, it is not possible to use the recording function by setting the time on a timer. That is, the conventional video tape recorder with a timer reservation recording function has the disadvantage that the reservation function does not function effectively in response to sudden changes in broadcast time or broadcast programs.

[Means for solving problems]

The video tape recorder of the present invention includes a memory that stores a predetermined video signal in advance, a comparator that compares the video signal stored in the memory with a received video signal, and starts recording based on the output of the comparator. - A switch circuit for switching and controlling termination.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of a first embodiment of the present invention. As shown in FIG. 1, the present invention includes an A-reverse converter 1,
It is configured to include a memory 2, a comparator 3, and a recording control switch 4.

In FIG. 1, a video signal that is not compared and matched is subjected to A-D conversion in an A-D converter 1, and the converted video signal 101 is input to a memory 2 and stored. on the other hand,
The received video signal is A-D converted in the same A-D converter 1, and the converted video signal 102 is input to the comparator 3, where it is read out from the memory 2 and is compared with the video signal 103 to be compared. be compared. The comparison output signal output from the comparator 3 is input to the recording control switch 4,
The start or end of recording is controlled by this comparison output signal. Note that the memory 2 requires a memory capacity sufficient to store video signals for two screens at the start and end of recording.

Alternatively, whether to compare the video signal 1 at the start or end of recording is determined by the signal 104 indicating the state of the recording control switch 4.
03 is controlled. In this first embodiment, since the start or end of recording is controlled by comparing the video signals, there is no need to set a scheduled recording time, and furthermore, the start or end of recording is controlled by comparing the video signals. It is possible to record even if

FIG. 2 is a block diagram of a second embodiment of the invention. As shown in FIG. 2, this embodiment includes an A-D converter 5, a memory 6, a comparator 7, a recording control switch 8, and a timer 9.

In FIG. 2, the operations of the A-D converter 5, memory 6 and comparator 7 are the same as in the first embodiment described above. The recording control switch 8 is controlled by a comparison output signal output from the comparator 7 or a control signal 109 sent from the timer 9. 'The memory 6 stores an A-D converted video signal of either the start or end of recording to be compared. When the video signal for starting recording is stored in the memory 6, the recording time is input to the timer 9 via the keyboard.

As a result of comparison with the received video signal 106 in the comparator 7, the recording control switch 8 is turned on to start recording, and the recording control switch 8 outputs a control signal 110 and sends it to the timer 9. The counter of the timer 9 enters the operating state via the control signal 110, and when the recording time comes, the timer 9 outputs a control signal 109 and inputs it to the recording control switch 8. The recording control switch 8 is controlled by the control signal 109 to be in an "off" state, and recording is stopped. That is, recording is started in response to the comparison result between the recording start video signal and the received video signal, and recording is stopped through counting in the timer. Therefore, it is possible to record a desired program even if the broadcast time changes.

Next, when the video signal indicating the end of recording is stored in the memory 6, a recording start time is set in the timer 9, and when the recording start time comes, the timer 9 outputs a control signal 109. The signal is input to the recording control switch 8. The recording control switch 8 is turned on under the control of the control signal 109 to start recording, and the timer 9 outputs a control signal 108 for outputting the video signal 107 indicating the end of recording from the memory 6. It is sent to memory 6. The subsequent operations are performed in the same manner as in the first embodiment.

In this second embodiment, even if the recording time is changed, the desired program can be recorded.

〔Effect of the invention〕

As described above, the present invention can control the start and end of recording for a desired program by comparing and checking a received video signal with a video signal stored in a predetermined memory in advance. This has the effect that a desired program can be effectively recorded in response to a shift in broadcast time, a change in broadcast time, etc.

[Brief explanation of the drawing]

1 and 2 are block diagrams of a first and second embodiment of the present invention, respectively, and FIG. 3 is a block diagram of a conventional video tape recorder. In the figure, 1, 5... A-D converter, 2, 6...
Memory, 3, 7... Comparator, 4, 8. 11... Recording control switch, 9.10... Timer. Agent Patent Attorney Susumu Uchihara ('' ゛) Video Signal Figure 7

Claims (1)

[Claims] A memory that stores a predetermined video signal in advance, a comparator that compares the video signal stored in the memory with a received video signal, and a switch circuit that switches and controls the start and end of recording based on the output of the comparator. A videotape recorder comprising: