JPS61253659A - Vtr apparatus - Google Patents

Abstract

PURPOSE:To record automatically a program searching signal by connecting the output terminals of a monostable multivibrator circuit and a square wave oscillating circuit to each input terminal of a NAND circuit and superposing a square wave oscillating output to the erasing current of an overall width erasing head. CONSTITUTION:A voice input signal 10 is inputted to a non-signal detecting circuit 1 and when high is outputted at the time of non-signal of intermusic, a monostable multivibrator is triggered by this rise and it is outputted. This output and the output of the non-signal detecting circuit are inputted to an AND circuit 3 and only in a period in which the non-signal time is longer than a reference time, high is outputted. As a result, the non-signal part of intermusic of a music source is distinguished from a non-signal part is music. Said outputs is inputted as the trigger of the monostable multivibrator and by this output and the NAND output of a square wave oscillating circuit 6, when a switching circuit 9 connected in series to an overall width erasing head 8 is turned on and off by some resistance value, by the frequency of the square wave oscillating circuit, only in a period in which the NAND output is high, a square wave oscillating output is superposed to an overall width erasing current and a program searching signal is recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a VT having a high-fidelity audio function.
The present invention relates to a method for automatically recording a cue signal for a music program on an R device.

[Background of the invention]

Conventionally, the VTR cue signal was recorded when recording started, and when recording was partially stopped and then canceled. recently,
The rotary head of the cylinder made it possible to record high-fidelity audio using the F'M method, and there was a demand for recording only music sources by taking advantage of the long-time recording capabilities of VTRs. Therefore, it has become necessary to consider a recording method that matches the music program for recording the cue. As a conventional example, Hitachi's VTR VT-16/VT-17 is an example of controlling by recording a cue signal at the boundary of image signal recording.

[Purpose of the invention]

An object of the present invention is to provide a function of detecting a no-signal portion between programs such as music and automatically recording a cue signal when recording VHS high-fidelity audio.

[Summary of the invention]

Conventionally, VTR cue signals are recorded at the start of recording.
Or it was recorded when canceling it after pausing the recording. This method focused on the division of images, but when used as an audio recording, we thought that it would be more convenient if a cue signal was also recorded between music source programs. When only one program is selected, the program has a function of automatically detecting the interval between programs and recording a cue signal.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

No-signal detection circuit that rectifies the audio input signal and outputs high when there is no signal 1. Reference time setting circuit that is triggered by a high input and outputs a low output for a certain period of time (reference time of no signal period between music source programs) 2. AND circuit 3 is triggered by high input and remains for a certain period of time (
(recording time of cue signal), monostable multivibrator circuit with high output 4. NAND circuit 5° square wave oscillation circuit 6
．． Full-width erase oscillator circuit7. Full width erase head8. It is composed of a switch circuit 9.

The present invention will be explained in detail below. An audio input signal 10 is input to a no-signal detection circuit, and a high signal is output when there is no signal between songs. The monostable multivibrator is triggered by the rise of the high signal of
) is output.

This output and the output of the no-signal detection circuit are input to an AND circuit, and a high output is output only during a period of no-signal time longer than the reference time T. By appropriately selecting this reference time, the no-signal portions between songs of the music source can be distinguished from the no-signal portions within the songs. The comparatively detected output is input as a trigger to a monostable multivibrator that sets the recording time of the cue signal, and a high output is obtained for a certain period of time.

This output and the NAND output of the rectangular wave oscillator circuit (which normally uses a switching signal for switching the video head) cause the switch circuit connected in series to the full width erase head to generate a rectangular wave only during the high period. By turning on and off at a certain resistance value at the frequency of the oscillation circuit, a full-width erase current K and a rectangular wave oscillation output are superimposed to record a cue signal. As a result, a cue signal is automatically recorded in the no-signal section between songs,
By detecting this when fast forwarding or rewinding, it is possible to locate the beginning of a movie.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a circuit diagram of an embodiment of the present invention.
It is a time chart of the signal waveform of each part of a figure. 1...No signal detection circuit gate 1 5...Route 6...Square wave oscillation circuit 7...Full width erase oscillation circuit 8...Full width erase head 9...Switch circuit 10...Audio input Signal I--10 No-+,,,,--d I1-11″1 佽. Item 1 Figure 2 Procedural amendment (method) Indication of the case 1985 Patent Application No. 95454 Title of the invention
Relationship with the VTR device correction case Patent application Person name (5
101 Hitachi Corporation Representative
Target of personal amendment Contents of full text amendment of specification

Claims (1)

[Claims] 1. A circuit that detects the no-signal portion of the input audio signal and outputs a high signal during the no-signal period, and in synchronization with the rise of the high signal,
Connect the output ends of both monostable multivibrator circuits that output a low signal for a certain set time and the input end of the AND circuit, and synchronize with the rise of the output of the AND circuit for a certain set time. , the output end of a monostable multivibrator circuit that outputs a high signal and the output end of a square wave oscillation circuit are connected to each input end of a NAND circuit, and the output end of the NAND circuit is connected in series with a full-width erase head. A VTR that is connected to a switch circuit and automatically records a cue signal by superimposing the rectangular wave oscillation output on the erase current of a full-width erase head while the output of the NAND circuit is high. device.