JPH0340254A - Video recording system - Google Patents

Abstract

PURPOSE:To prevent recorded picture from being erased by changing a broadcasting hour and to reduce setting error by comparing a set indicator with an indicator, which is extracted from a transmitting signal, and starting the recording operation of a video recorder when the both indicators are coincident. CONSTITUTION:Television broadcasting waves received by a radio wave reception circuit 24 are detected, supplied as video signals to a video circuit 25 and supplied to a code extracting circuit 26. In the code extracting circuit 26, a code such as the indicator, etc., is extracted from the received video signals and this extracted code is compared with the indicator, which is held to an indicator set holding circuit 23, by a comparator circuit 27. When the both indicators are coincident, a coincidence signal is supplied through a selecting circuit 28 to a record starting signal preparing circuit 15 and a record starting signal 16 is sent out. Thus, even when the broadcasting hour is delayed rather than the hour, which is announced in advance, or broadcasting is stopped, the pictures can be recorded without fail.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video recording system for recording broadcasted television images using a video recording device.

"Prior Art" FIG. 4 shows the configuration of a recording device in a conventional video recording system C2. Recorded in the recording start time setting holding circuit 11
il start time is set, and the recording time is set in the recording time setting holding circuit 12. Recording start time setting holding circuit 11ζ=
The set recording start time and the clock in the recording device (2)
The comparison circuit 14 compares the time indicated by 3 with the time indicated by 3, and when the two match, a matching signal is sent to the recording start signal generation circuit 15, and the recording start signal generation circuit 15 outputs a recording start signal to the drive circuit of the circular part of the device. Send 16. This recording start signal 16 is also sent to an adder circuit 171, and the adder circuit 17 uses the clock 1 at that time.
The time indicated by 3, that is, the recording start time and the recording time set in the recording time setting holding circuit 12 are added, and the addition result is held in the @yu end time holding circuit 18 as the recording end time. This recording end time and the time indicated by the clock 13 are compared in a comparison circuit 19, and when they match, a matching signal is sent to the recording pH end signal creation circuit 21, which is driven by a drive inside the device. Circuit C=Sends recording end signal 22.

In the conventional video recording method, when a video broadcast from a broadcasting station is recorded by a video recording device, a recording start time and end time or recording time are set. In other words, this was a recording method in which the user set the recording start time in advance.

"Problem that the invention aims to solve" When recording with a video recording device according to a set recording start time as in the past, the originally set broadcast start time may change for some reason. If this happens, you will need to configure the settings again. Especially after setting
If you are away from the location of the video recording device at the scheduled broadcast time, you will often be unable to respond to the change in broadcast time and lose the recording. Furthermore, when setting up recording, it is necessary to set the broadcast day of the week, broadcast channel, etc. of the broadcast program, but since it is necessary to set the settings in detail, sometimes a setting error may occur and the recording may be lost.

``Means for Solving the Problems'' In the present invention, a transmitting side transmits a program to be broadcast with a program-specific indicator attached thereto, and a receiving side selects a program to be recorded using the indicator. In other words, the receiving side sets the program reissudicator that you want to record, compares the set indicator with the indicator extracted from the transmitted signal, and if the two match, the video recording device starts the recording operation. Start. To end the recording in step 7, use the broadcast time or broadcast end time of the block associated with the indicator, or use the recording time set on the recording device side. This indicator method can embed various contents using indicators with a large amount of information.

"Operation" According to this configuration C2, recording is not lost due to changing the broadcast time C2, and setting errors are reduced.

``Embodiment'' (Although not shown here, in this invention, a unique Q) indicator is attached to each program unit to be transmitted on the transmitting side and transmitted. This indicator is inserted at the beginning of the program, for example during the vertical blanking period with a digital code (-).

FIG. 1 shows an example of the structure on the recording equipment side in this invention system. FIG. 1 shows a device C2 in which the present invention is applied to which the recording start time and recording time can be set on the recording device side as in the conventional case, and parts corresponding to those in FIG. 4 are given the same reference numerals. In this invention, an indicator setting holding circuit 23 is provided,
In response to this, a desired recording program indicator is set. The television broadcast radio waves received by the radio wave reception circuit 24 are inspected and supplied as a video signal to the video signal path 25 and also to the code extraction circuit 26. The code extraction circuit 26 extracts a code such as an indicator from the received video signal, and this extracted code is used as the indicator setting holding four-way 23 (=the set indicator and the comparison circuit 27
When the two match, a match signal is sent to the selection circuit 28.
Recorded via Record 1, l! lI start signal generation r=supplied to path j5. As a result, a recording start signal j6 is sent out.

Record I [! The lj end signal 22 is created in the same way as in the case of FIG. The selection circuit 28 selects the output of the comparison circuit 14 (1) and the output of the comparison circuit 27 to record! li start (Created by 'L'j, supplied to Seiichikawaji 15. There are two options for instructing the start of recording: by time and by indicator.

FIG. 2 shows an example of a transmission code including indicators and the like. Figure A shows the indicator 5, the broadcasting channel 52, the new program time 53, and the error side ratio/correction code (ECC) for these code bits.
)54. In this example, by including the required time in the transmission code, there is no need to set the recording end time on the recording device side, and setting errors can be prevented. In the case of B in the same figure, an indicator 6I indicating the program and a C2 start signal 62 are inserted at the beginning of the program, and an indicator 71 indicating the program is inserted at the end of the program. In FIG. 2A, the end time may be used instead of the required time.

Figure 3 shows an error detection/correction code added to the transmitted signal to prevent the recording from being lost due to an error in receiving the indicator when the radio wave condition is not very good. This is an embodiment in which a receiving code error detection/correction circuit is added in a signal receiving system. The signal C2 extracted by the code extraction circuit 26 is a signal to which the ECC shown in FIG. 82 is added together with the code. Using this signal, the error detection and correction circuit 29 detects whether or not there is an error in the received signal, and if an error is detected, it is corrected and sent to the latch circuit 29.
It is held at 1. The output of the latch circuit 31 and the contents of the indicator setting holding circuit 23 are compared in a comparison circuit 27,
The coincidence signal is input to the selection circuit 28 shown in FIG. 1 and sent out as a recording start signal.

"Effects of the Invention" As explained above, compared to the conventional method of setting the recording start time when video recording is performed, by using the method of the present invention, the broadcasting time can be changed without any hindrance. However, even if the program is delayed from the originally announced time or the broadcast is cancelled, the effect of being able to reliably record the target program can be expected.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of the configuration of the recording device in this invention method G2, and the second figure is a diagram showing an example code for identifying the program to be broadcast in this invention L:
FIG. 3 is a block diagram showing an example of the configuration of the receiving device when an indicator error detection and correction code is added, and FIG. 4 is a block diagram showing the configuration of the recording device in a conventional video recording system. Patent originator Nippon Telegraph turtle system company agent Takuya Kusano illustration

Claims (3)

[Claims] (1) In a method in which a transmitter transmits an image signal and a receiver records the transmitted content using a video recording device, the transmitter attaches a unique indicator to each program unit to be transmitted, and the receiver transmits the signal. A means for extracting an indicator from a signal, a means for setting an indicator of a program to be recorded, a means for comparing the set indicator with the sent indicator, and if the comparison matches, the above video recording is performed. 1. A video recording method, comprising means for starting a recording operation of the device. (2) The video recording system according to claim 1, further comprising means for extracting a recording start time and a recording end time based on the transmission signal, and performs recording start and end operations. (3) The video recording system according to claim 1 or 2, wherein an error detection/correction code is added to the indicator and transmitted, and an error detection/correction circuit for the indicator is added to the receiving device.