JPH0322775A - Vcr - Google Patents

Abstract

PURPOSE:To obtain accurate correspondence to video recorded on video tracks when data are reproduced and retrieved by recording data relative to video by deep-layer recording heads. CONSTITUTION:Index data (serial code data) is generated and converted by a audio pand converting circuit 26 into a signal of the audio band. The signal is passed through a data changeover switch 17, an audio signal modulating circuit 18, a recording and amplifying circuit 19, a recording/playback switch 20, and a rotary transformer 12 and recorded on the magnetic tape 7 by the deep-layer recording heads 3 and 4. The data changeover switch 17 is switched to the side of the audio band converting circuit 26 and then the index data is recorded on the video tracks while superposed upon the original video. Consequently, the correspondence relation between the video and index is never lost and the index signal is reproduced to perform accurate retrieval.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a VTR (video tape recorder) having a deep recording head.

[Conventional technology]

Conventionally, data for image retrieval of a VTR has been recorded as an index signal on a control track together with a control signal. [Problem to be Solved by the Invention] For this reason, when reproducing and searching this, there are cases where the video does not correspond to the video recorded on the video track.

SUMMARY OF THE INVENTION An object of the present invention is to provide a VTR that can record data such as index numbers that accurately correspond to images.

[Means to solve the problem]

To this end, the present invention provides a VTR having a deep recording head for video track recording, in which video-related data is recorded by the deep recording head. [Examples] Examples of the present invention will be described below. V of this example
TR uses a deep recording head that is used in Hi-Fi VTRs. This deep recording head records the audio signal on the video track in the thickness direction by overwriting the video signal, and it does not degrade the brightness signal or color signal of the video signal, and also prevents the maximum frequency deviation of the audio signal. It has the characteristic of being large.

FIG. 1 is a block diagram of the main parts of a VTR according to an embodiment of the present invention. The rotating drum is provided with two video heads 1, 2, and two of the above-mentioned deep recording heads 3, 4, and a control head 5, a fixed audio head (not shown), an erase head, etc. (not shown) are provided at fixed positions. magnetic tape 7
touch. In the video signal system, a video signal input from an input terminal 8 is modulated by a video signal modulation circuit 9, amplified by a recording amplifier circuit 10, and then transmitted to the video via a recording/re-switch 11 and a rotary transformer 12. 2. Further, the video signals reproduced by the video heads 1 and 2 are demodulated by the video signal demodulation circuit 14 via the rotary transformer 12, the recording/reproduction switch 11, and the reproduction amplification circuit 13, and are output to the output terminal 15.

On the other hand, in the Hi-Fi audio signal system, the audio signal input from the audio input terminal 16 is
It is modulated by the audio modulation circuit 18 via the recording amplifier circuit 1.
After being amplified in step 9, the signal is deep-recorded on the video track of magnetic tape 7 in deep recording heads 3 and 4 via a record/re-switch 20 and a low retransistor 12. The audio signals reproduced by the deep recording heads 3 and 4 are demodulated by the audio signal demodulation circuit 22 via the rotary transformer 12, the recording/reproduction switch 20, and the reproduction amplification circuit 21, and are demodulated by the audio signal demodulation circuit 22. The signal is output to the output terminal 24 via the signal line.

Reference numeral 25 denotes a control circuit including a servo circuit, in which index data (serial code data) is generated based on commands from an operation unit (not shown), and converted into a voice band signal in a voice band conversion circuit 26. converted. Then, this signal is recorded on the magnetic tape 7 by the deep recording switches 3 and 4 via the data changeover switch 17, the audio signal modulation circuit 18, the recording amplifier circuit 19, the recording/re-switch 20, and the rotary transformer 12. .

Further, the data audio signal reproduced by the deep recording heads 3 and 4 is demodulated by the audio demodulation circuit 22 via the low retransformer 12, the recording/reproduction switch 20, and the reproduction amplification circuit 21.
Furthermore, the data is input to the data signal reproducing circuit 27 via the switch 23, where the data is reproduced, and then input to the control circuit 25 manually.

Note that a signal from a reference signal source 28 is amplified by a recording amplification circuit 29 and sent to the control head 5 via a recording/re-switch 3.
Transmit via 0. Also, this control head 5
The reproduced control signal is taken into the reproducing amplifier 31 via the recording/reproducing switch 30, and is input to the control circuit 25 from there.

From the above, by switching the data changeover switch l7 to the audio band conversion circuit 26 side, the index data is recorded on the video track overlapping the original video, so there is no possibility that the correspondence between the video and the index will be distorted. It disappears. Therefore, if you search by reproducing this index signal, you can perform an accurate search. Note that the data recorded on the video track by this deep recording head is not limited to index data. For example, frame address data, time code data, subtitle data for image software, etc. can also be recorded. In addition, if index data is recorded by the control head as before, a rough search will be performed using the index data detected by the control head, and a search will be performed using the frame address and time code detected by the deep recording head. You can also perform detailed searches. Furthermore, it goes without saying that this recording method can also be applied to high-definition VTRs.

〔Effect of the invention〕

As described above, the present invention is characterized in that it is possible to record data that accurately corresponds to a video.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the main parts of a VTR according to an embodiment of the present invention.

Claims (1)

[Claims] (1) A VTR having a deep recording head for recording video tracks, characterized in that data related to the video is recorded by the deep recording head.
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