JPS5843071Y2 - Recording muting time display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording muting device for a tape recorder.

Recently, many tape recorders are equipped with a manual recording muting device.

Such a manual recording muting device is for providing a non-recording portion of a desired time at a desired time during the recording operation of a tape recorder.

Such recording muting is performed when it is desired to cut out commercial parts during FM air checks.
Such a recording muting device is particularly useful for cassette decks where tape editing after recording is difficult.

However, manually setting the desired recording muting time is done by operating while looking at a clock, and in practice it is not easy to set the desired recording muting time.

Therefore, the purpose of the present invention is to provide a recording muting system that facilitates the setting of recording muting time, that is, non-recording time, by displaying the elapsed time from the start of recording muting using a meter installed in the tape recorder. It is about providing.

The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a circuit of a recording section including a recording muting device according to the present invention.

For this circuit, the signal to be recorded is supplied to the flat amplifier 2 via the input terminal 1, and then via the resistor Ro to the recording amplifier 3 where it is adjusted to a level commensurate with the %ti of the recording tape. supplied to

On the other hand, the output of the flat amplifier 2 is supplied to the meter 2 via the amplifier 5, the diode Do, the variable resistor VRo, and the make contact of the switch 51-3.

That is, the meter M displays the input signal level.

Switch S1. S2 and S3 are interlocked with each other,
For example, it may be operated manually.

The switch S1 works as a muting switch, S2 works as a start switch, and S3 works as a changeover switch.

When these switches are in the illustrated state, the @sound muting operation is in progress.

The recording muting device according to the present invention includes a series resistor Ra connected to the start switch S2 contact 2.

R2, a transistor Q1 having its base connected to the connection point of resistors R1+R2, a capacitor C1 connected between the base and collector of the transistor Q1, a resistor R3 connecting the collector of the transistor Q and a power supply B (a) having a voltage of Voc. , and a variable resistor VR1 connected to the collector of the transistor Q1.

Note that the movable contact of the switch S2 is connected to the power source B(1).

Capacitor C1, transistor Q1, etc. constitute a Miller integration circuit.

Next, the operation of the above circuit will be explained.

Switch S1. S2. The movable contact S3 normally contacts the contact 2, and in this case, recording muting is not performed and the capacitor C1 is charged.

Further, a meter M displays the output level of the amplifier 2.

Next, when you start recording muting, switch S
2 is the collector potential V of the closed transistor Q1.

As shown in FIG. 2, the voltage increases in proportion to time and reaches the voltage [f,Voo] as time passes.

This potential V.

is displayed by meter M via switch S3.

For example, if the display section of the meter M is configured as shown in the third figure, the potential V.

The change in will display the elapsed time from the start of recording muting.

From the above, it is clear that the recording muting time display device according to the present invention makes it easy to set the non-recording time.

In addition, the muting time display meter can be used in combination with a meter used for other purposes, and there is no need to provide a separate meter.It can be used as a kind of alarm display to indicate that the meter operation is muting. It also becomes.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a recording unit including a recording muting device according to the present invention, Fig. 2 is a diagram showing the operation of the recording muting device of Fig. 1, and Fig. 3 is a circuit diagram of a recording section including a recording muting device according to the present invention. It is a figure showing the display part of a meter. Explanation of symbols of main parts, 2...Flat amplifier, 3.
... Recording amplifier, 4... Recording head, 5... Meter amplifier, M... Meter, Sl... Muting switch, S2... Start switch, S3... Changeover switch.

Claims (1)

[Claims for Utility Model Registration] (1.) A start switch interlocked with a recording muting switch, a voltage generating circuit that generates a voltage according to the time elapsed after the start switch is activated, and a display means that displays the voltage. A recording muting time display device for a tape recorder, comprising: (2) The device according to claim 1, wherein the voltage generating circuit includes a Miller integrating circuit. (3) Utility model registration claim 1 or 2, further comprising a changeover switch that selectively supplies a signal corresponding to the output of the voltage generating circuit and the input voltage of the tape recorder to the display means. Apparatus described in section.