JPH0352467A - Vtr controller - Google Patents

Abstract

PURPOSE:To retrieve a program in spite of the time when the program is broadcast by designating the specific picture of the program set as the target of recording as image data for retrieval, and comparing it with image data to be retrieved. CONSTITUTION:When the recording, for example, of a movie, news, or drama on specified day of the week, etc., is performed, the title picture of the program is stored in a frame memory 4, and it is set as the image data for retrieval. A composite video signal inputted to an input terminal 1 is stored in a frame memory 5 on the other side at every frame sequentially as data of four bits as being updated. An image in the frame memory 4 and 5 is always compared with that in the frame memory 5 with a comparator 6, and when coincidence is obtained in both images, a coincidence signal is outputted from the comparator 6, thereby, a start pulse is generated at a recording start pulse generation circuit 7 by the coincidence signal. In such a way, a desired program, etc., are recorded normally even when broadcast time is changed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for automatically operating a VTR (video table recorder, hereinafter the same).

[Conventional technology]

Normally, in order to automatically record a VTR, the number of the channel to be recorded, the time to start recording, the time to end recording, etc. are set using a program timer device installed therein.

[Problem to be solved by the invention]

However, this method uses a timer set, and for example, if the timer is set to record a movie program following a baseball program, and the broadcast of that baseball program is extended, the movie program will be recorded. There is a problem in that the broadcast time of the video is shifted by the amount of the extension, making it impossible to record normally.

SUMMARY OF THE INVENTION An object of the present invention is to provide a VTR control device that allows a desired program to be recorded normally even if the broadcast time is changed. (Means for Solving the Problems) For this purpose, the VTR control device of the present invention includes a first frame memory for storing search image data selected from among the input video signals, and a first frame memory for storing search image data selected from among the input video signals. A second frame memory that stores image data while being updated, and a comparator that compares the image data stored in the first and second frame memories, and outputs a coincidence signal from the comparator. The VTR was configured to be controlled by the following.

〔Example〕

Examples of the present invention will be described below. FIG. 1 is a block diagram of a VTR control device according to one embodiment.

■ is the input terminal to which the composite video signal of the received TV broadcast is manually input, and 2 is the input terminal for inputting the composite video signal to the 8
This is an A/D converter that converts bits into digital signals.

3 is a switch, and 4 is a first frame memory for a search code screen, which takes in two consecutive fields of 8-bit video signals and stores, for example, the upper four bits. 5 is a second frame memory for the screen to be searched;
Similar to the frame memory 4, two consecutive fields of an 8-bit video signal are taken in and the upper four bits are stored. 6 is a comparator, and both frame memories 4,
The image data written in 5 is compared frame by frame. Reference numeral 7 denotes a recording start pulse generating circuit which sends a recording start signal to the VTR based on the coincidence signal output from the comparator 6.

In this circuit, when the composite video signal of the search code screen (frame) is input to the input terminal 1, by momentarily turning on the switch 3, the upper 4 bits of the image data at that time are stored in the frame memory 4. be remembered. Therefore, for example, when recording a program such as a movie, news, or drama on a specific day of the week, the title image of the program is stored in the frame memory 4 and used as image data for search. In the other frame memory 5, the composite gamma video signal input to the input terminal 1 is stored as 4-focus data while being updated sequentially every l frame.

Then, the images stored in the frame memories 4 and 5 are constantly compared in the comparator 6, and when the data of both images match,
Since a match signal is output from the comparator 6, a start pulse is generated in the recording start pulse generating circuit 7 based on the match signal.

Therefore, by inputting the same signal as the composite video signal input to the human input terminal 1 to the video input terminal of the VTR (
In other words, if they are set to match the same channel number), recording of the program of the title picture will be started upon generation of the recording start pulse.

Further, if an off timer is set to a predetermined time in the VTR, the off timer starts.

Therefore, the VTR continues recording until its off timer completes timer up.

As described above, according to this embodiment, even if the broadcast time of a program reserved for recording is changed, the program can be completely recorded. Also, after converting the composite video signal into 8-bit digital data, only the above 4 bits are recorded in the frame memories 4 and 5 and compared in the comparator 6, so one line (horizontal scanning line) is 910 bits.
In the case of pixels, 910 (do 7}) x 4 (bint) x 525 lines = approximately 2M
It becomes a bit, and the memory capacity can be reduced.

Furthermore, since the comparison value is limited, it is also possible to prevent detection failures at the same time.

Although the embodiment shown in FIG. 1 can of course be constructed as a single unit, it is preferable to incorporate it into a VTR.

In this case, by making the frame memory 5 an 8-bit memory, it can be used for still image reproduction.

FIG. 2 is a diagram showing a program for a VTR control device according to another embodiment. Here, a Y separation circuit 8 is provided on the output side of the A/D converter 2 to extract only the luminance component of the digital video signal. The bit number conversion circuit 10 performs a bit number conversion of 8 bits=>4 bits, and outputs this to the frame memories 4 and 5.

In this way, since the signal after Y separation is handled, there is an advantage that the search accuracy is improved without being influenced by color (difference in sampling points).

In the embodiment shown in FIG. 2, the digital video signal is
Since the C-separated Y signal is used, for example, a digital television receiver (I
It is advantageous for incorporation into DTV, EDTV), etc.

For this Y separation, for example, a comb filter type Y/C separation used in a digital television receiver is used. This Y
/C separation requires that the phase of the color signal is 180° between adjacent lines.
Line-to-line <C type filter using points with different degrees (3rd
Figure (a)〉 and a frame-listening filter (Figure 3) that uses points that differ by 180 degrees on the same line between frames
b)).

In FIG. 3, II is an IH delay circuit, l2 is an l-frame delay circuit, 13 and l4 are subtraction circuits, and 15 is a bandpass filter that selects C.

Line-listening type filters have the advantage that cross-soto color interference is not noticeable when separating Y/C of videos, and frame-opening filters have the advantage that the same interference is not noticeable during Y/C separation of still images. It is used depending on the detection result of the image detection circuit.

〔Effect of the invention〕

As explained above, according to the present invention, a specific screen of a program to be recorded is used as image data for search, and this is compared with image data to be searched. The program can now be searched regardless of the time it is broadcast, and there is no risk of being affected by shifts in program broadcast times. Therefore, it has the advantage of being extremely convenient for recording when the VTR is away.

[Brief explanation of drawings]

Fig. i is a block diagram of a VTR control device according to an embodiment of the present invention, Fig. 2 is a block diagram of the same VTR control device according to an embodiment of NEJ, and Fig. 3(a) is a circuit diagram of a line filter. , (bl is a box diagram of a frame listening filter circuit. 1...Composite video signal input terminal, 2...A
/D converter, 3...Switch, 4, 5...Frame memory, 6...Comparator, 7...Recording start pulse generation circuit, 8...Y separation circuit, 9...Low Bus filter, 10... Bit number conversion circuit, 11... IH delay circuit, 12... l frame delay circuit, l3, 14...
...Subtraction circuit, l5...Pandobass filter.

Claims (5)

[Claims] (1) a first frame memory that stores search image data selected from input video signals; a second frame memory that stores image data of the input video signals while updating; A VTR control device comprising a comparator for comparing image data stored in first and second frame memories, and controlling a VTR by outputting a match signal from the comparator. (2) The VTR control device according to claim 1, wherein the first frame memory stores only the most significant bits of the image data. (3) The VTR control device according to claim 1, wherein image data obtained by separating and extracting a Y signal from the image data is stored in the first and second frame memories. (4) By outputting the match signal from the comparator, the VTR
2. The VTR control device according to claim 1, wherein the VTR control device starts recording. (5) By outputting the coincidence signal from the comparator, the VTR
5. The VTR control device according to claim 4, wherein the VTR control device starts an off timer.