JPS6246453A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To easily perform a program searching by making it possible to record an index signal also in case of recording from a recording pause at the recording of only voice. CONSTITUTION:A sound signal and a video signal are recorded from external signal input terminals 3a, 3b in a magnetic tape through a sound signal recording circuit 5 and a video signal recording circuit 6. Only when a synchronizing signal is included in the video signal, a video signal detecting circuit 10 outputs a logic low level output 10a. Since the output 10a is in the low level when the recording signal is the video signal including the synchronizing signal in said constitution, an index signal recording circuit 13 is not driven even if a high level signal is outputted from a system control circuit 15 at the release of the recording pause. Since the output 10a is in the high level at the recording of only the sound signal, an index signal is recorded by a signal 15a also at the release of the recording pause. In case of recording from a stop mode, an output 15b is used to actuate the circuit 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a VT)I program cue system, and particularly to a magnetic recording and reproducing device that is easy to use.

[Background of the invention]

Conventionally, recording of an index signal for locating the beginning of a VTR program was limited to recording from a stop mode, and was not possible when recording was restarted from a recording pause state. The reason is that recording pauses are often used for commercial cuts etc. during recording (and are not at the change of the program, so recording is intentionally done as an index signal.The present invention relates to a method for improving this). Various ideas regarding the cueing method have been proposed, an example of which is the
There is No. 19053.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic recording and reproducing apparatus that controls the recording of index signals according to the contents of recorded programs and allows easy finding of the beginning of a program.

[Summary of the invention]

Unlike the recording of general commercial TV programs, etc., only the audio can be recorded using VTi.
(In some cases, this is often the case with VTRs that record an M-modulated audio signal on the video track of a magnetic tape together with the video signal.) In this case, the source source is a tape, record, etc., or an FM17 ) There are many air checks, etc., and there is no need for commercial cuts in 'zuka programs, and recording pauses are often used at the change of the program (
By loading and unloading the tape, inadvertent recording of noise is prevented and good recording is possible. Therefore, if it is possible to record an index signal only when recording only audio or when recording from a pause, usability will be further improved.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

The figure shows an example of the circuit configuration of a VTR embodying the present invention, where 1 is an antenna, 2 is a built-in tuner, 2a is an output terminal for an audio signal, and 2b is an output terminal for a video signal.

Reference numeral 4 denotes a changeover switch between a chainer output and an external input signal, and the figure shows the state when the external input signal is selected. 3a,
5b is an external signal input terminal, 3a is the audio side, and 3b is the video side. Reference numerals 5 and 6 are recording circuits for audio signals and video signals, respectively, and the signals passing through these circuits are sent to the recording head 7.
8 is recorded on the magnetic tape 9. Reference numeral 10 denotes a video signal detection circuit, which detects only a synchronization signal in the video signal and generates an output 10a only when there is a synchronization signal.

In this case, the output ioa is a logic low level11.1
As can be seen from the figure, 2 is a logical accumulation and logical sum circuit. Reference numeral 13 denotes an index signal recording circuit, which operates only when the output of the OR circuit 12 is at a logical high level, and the index signal is recorded on the tape 9 by the magnetic head 14. Reference numeral 15 indicates a part of a system control circuit composed of a microprocessor and the like for controlling the entire operation of the VTR.

By configuring as described above, when the recording signal is a video signal including a synchronization signal, the output 10a is at the A-level, so even if the high level signal 15a is output from the system control circuit 15 when canceling the recording pause, the index Signal recording circuit 1
3 does not operate, but since the output 10a is at a high level when recording only the audio signal, the index signal is recorded by the signal 15a even when the recording pause is released. -When recording from the 10,000-stop mode, the output is 10a because the signal is from output 15b.
The index recording circuit 13 operates regardless of the situation. With the above, an example of index signal recording that satisfies the desired function can be obtained.

〔Effect of the invention〕

According to the present invention, since index signals are recorded in accordance with the 8 answers of the recorded program, the cueing operation during playback becomes more convenient and the usability is greatly improved.

[Brief explanation of drawings]

The figure is a block diagram showing an embodiment of the magnetic recording/reproducing circuit of the present invention. 2: Tuner, 5: Audio signal recording circuit, 6: Video signal recording circuit, 1o: Video signal detection circuit, 15 system control circuit

Claims (1)

[Claims] A magnetic recording and reproducing device capable of recording and reproducing both video signals and audio signals on a magnetic tape, which has an index signal recording circuit to enable the beginning of a program, and in addition to when recording starts from a normal stop position. A magnetic recording/reproducing apparatus characterized in that when recording only an audio signal without a video signal, the index signal can be recorded even when recording is resumed from a recording pause state.