JPH05103295A - Video tape recorder - Google Patents

Abstract

PURPOSE:To simultaneously record information concerning a recorded image such as a recording date, a title, video identification, etc. CONSTITUTION:Information concerning the video to be recorded is encoded by an encoding part 2 and encoding data b is superimposed in a superimposing circuit 4 within the vertical flyback time of a composite video signal (a) of the image. The superimposed data is recorded by a video signal recording part 5 and a electromagnetic conversion system circuit 6. A video tape recorder is provided with a video signal reproducing part 7 for reproducing, a recording information code extracting part 8 and a code decoding part 9 converting the code data. The various kinds of functions are executed in accordance with the decoded code data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video tape recorder, and more particularly to a video tape recorder for extracting a signal superimposed on a video signal.

[0002]

2. Description of the Related Art A conventional video tape recorder only records and reproduces an input video signal and does not record any additional data.

[0003]

The above-mentioned conventional video tape recorder has a drawback in that the recording person must record the information regarding the recorded video such as the recording date and time as a separate work.

It is an object of the present invention to provide a video tape recorder capable of simultaneously recording information regarding such an image and executing various functions associated therewith.

[0005]

SUMMARY OF THE INVENTION A video tape recorder according to the present invention comprises an unnecessary signal removing section for inputting an image signal and removing an unnecessary signal to create a composite video signal, and a code for encoding information about an image to be recorded. An encoding unit, a superimposing circuit that superimposes the code data from the encoding unit on the composite video signal from the unnecessary signal removing unit within the vertical blanking period of the composite video signal, and based on the output of the superimposing circuit. A video signal recording unit for recording via an electromagnetic conversion system circuit, a video signal reproducing unit for reproducing via the electromagnetic conversion system circuit, a recording information code and the composite video from the output of the video signal reproducing unit. The recording information code extracting unit for separating the signal and the code decoding unit for decoding the recording information code are configured.

[0006]

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

FIG. 1 is a block diagram of a video tape recorder showing an embodiment of the present invention, and FIG. 2 is a signal waveform diagram of each point in FIG. As shown in FIGS. 1 and 2,
In this embodiment, a video signal to be recorded is input from the input terminal IN in the form of a composite video signal. Normally, composite video signals are sent from the broadcasting station to VITS /
Many signals such as VIR signals, GCR signals and teletext signals are superimposed and sent. Since these signals are not used in the recording signal processing circuit of the video tape recorder,
The unnecessary signal removing unit 3 removes the signal only during the horizontal scanning period in which the information is superimposed, to obtain the recording video signal a. On the other hand, information about the recorded video (recording date, title, etc.) is created as binary data by the system control microcomputer 1 by an external input and a built-in timer, and the encoding unit 2 generates a reference signal and a necessary signal. An error correction signal is added and coded. The signal at this time becomes the recording information code b. This recorded information code b is used in the superposition circuit 4
In the vertical retrace period of the recording video signal a, the recording signal c is superposed at a predetermined position like the enlarged recording signal d, for example. The recording signal c is subjected to signal processing necessary for recording on the video tape recorder in the video signal recording section 5. Thereafter, the processed signal is recorded on the magnetic tape by the electromagnetic conversion system circuit 6.

At the time of reproduction, the signal reproduced from the magnetic tape using the electromagnetic conversion system circuit 6 is subjected to signal processing by the video signal reproducing section 7 to reproduce the recording signal c. This recording signal c
Is separated into a recording information code b and a recording video signal a by the recording information code extracting section 8. The recording video signal a is directly output as a video signal from the video signal output terminal OUT. On the other hand, the recorded information code b becomes the information about the image in the code decoding unit 9, and the system control microcomputer 10 outputs the contents (recording date, title, etc.) according to this information through on-screen display or the like.

As described above, according to this embodiment, a signal in which necessary information is coded is superposed within the vertical blanking period of a composite video signal to be recorded, and recording signal processing is performed to record the signal on a video tape. To do. On the other hand, in playback,
The reproduction signal processing is performed, and when the composite video signal is obtained, the code signal is extracted and decoded to obtain the necessary signal.

In addition to the above-described embodiment, it is possible to configure a system for cueing and reproducing recorded information with a video tape recorder. Hereinafter, description will be made with reference to FIGS. 1 and 2.

First, as in the above-described embodiment, the image identification information for distinguishing the recorded image signal from other image signals is created as binary data by the system control microcomputer 1 according to an instruction from the outside. Then, it is coded by the coding unit 2 to obtain the video identification code b. Also,
This video identification code b is applied to the recording video signal a by the superimposing circuit 4.
During the vertical retrace line period of the recording signal c, the recording signal c is superimposed on a predetermined position such as a recording signal (partially enlarged) d.
Becomes At this time, since the video identification code b is mainly used in the search mode, a reference signal may be added before the video identification code b, if necessary. This recording signal c is subjected to signal processing necessary for recording by the video tape recorder in the video signal recording unit 5, and is recorded on the magnetic tape by the electromagnetic conversion system circuit 6.

On the other hand, when the cueing reproduction of a desired image is performed using this image identification code b, the signal reproduced from the magnetic tape in the electromagnetic conversion system circuit 6 in the search mode is processed by the image signal reproducing section 7. Then, the recording signal c is reproduced. The recording signal c is separated by the recording information code extracting section 8 into a video identification code b and a recording video signal a. This recording video signal a is directly used as a video signal at the video signal output terminal OUT.
Output from. Further, the recorded information code b is the code decoding unit 9
It becomes the video identification information. Since the system control microcomputer 10 has the video identification information instructed from the outside, when this video identification information comes from the code decoding section 9, it is judged as a necessary screen and the normal reproduction mode is set.

As such image identification information, a movie, music,
By setting a code for each genre such as sports, it is possible to extract only the genres you want to see from a single tape containing various genres and play them.

[0014]

As described above, the video tape recorder of the present invention superimposes a signal encoding necessary information within a vertical blanking period of a composite video signal to be recorded and performs recording signal processing. While recording on a video tape, the reproduction signal processing is performed and the code signal is extracted and decoded to obtain the necessary signal, which relates to the recorded video such as recording date / time, title, and video identification. There is an effect that information can be recorded at the same time and various functions corresponding to the recording can be executed.

[Brief description of drawings]

FIG. 1 is a block diagram of a video tape recorder showing an embodiment of the present invention.

FIG. 2 is a signal waveform diagram of each point in FIG.

[Explanation of symbols]

1,10 System control microcomputer 2 Encoding device 3 Unwanted signal removing unit 4 Superimposing circuit 5 Video signal recording unit 6 Electromagnetic conversion system circuit 7 Video signal reproducing unit 8 Recording information code extracting unit 9 Code decoding unit IN input terminal OUT Video Signal output terminal

Claims (1)

[Claims] 1. An unnecessary signal removing unit that inputs a video signal and removes an unnecessary signal to create a composite video signal, an encoding unit that encodes information regarding an image to be recorded, and the unnecessary signal removing unit from the unnecessary signal removing unit. A superimposing circuit that superimposes the code data from the encoding unit on the composite video signal within the vertical blanking period of the composite video signal;
From the output of the video signal recording unit for recording via the electromagnetic conversion system circuit based on the output of the superposition circuit, the video signal reproducing unit for reproducing via the electromagnetic conversion system circuit, A video tape recorder comprising: a recording information code extracting section for separating a recording information code and the composite video signal; and a code decoding section for decoding the recording information code.