JPS5919947Y2 - Tape recorder pause circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control circuit for a tape recorder, and more particularly to a pause circuit that temporarily stops the running of the tape and interrupts the recording operation when there is no recording input signal.

Traditionally, commonly used tape recorders are equipped with a mode selection lever for recording, playback, fast forward, rewind, and stop, and recording and playback can be performed by selecting and operating this lever. There is.

In this case, if you select and operate the recording mode lever,
A tape recorder maintains its recording state regardless of the presence or absence of a human input signal.

As a result, the magnetic tape continues to run even when there is no input signal (sound), resulting in wasted recording and
During playback, the playback time of this no-signal recording portion is also wasted.

This is a particularly important problem in microcassettes and the like where it is necessary to prevent power consumption.

To solve this problem, there is a device equipped with a temporary stop function.

However, this tape recorder can
In other words, by operating the pause switch when there is no input signal (sound), the running of the tape and the recording state are temporarily stopped.

In this case, there are two ways to temporarily stop the tape running, such as moving the pinch roller away from the capstan and stopping the rotation of the capstan. For micro cassettes, etc., the latter method is recommended to prevent battery consumption. It is used.

However, although the above-mentioned pause function is more convenient than resetting and setting the recording mode each time, depending on the presence or absence of an input signal (audio), it is extremely complicated to operate because it is a manual operation. It has various drawbacks, such as the fact that a person who only performs this operation must be nearby at all times.

Therefore, the purpose of the present invention is to enable the conventionally known pause function to be incorporated as is, and to
Presence or absence (magnitude) of input signals that should be recorded by simplifying the configuration
The present invention provides a tape recorder pause circuit that can automatically pause the recording state and continue recording.

Hereinafter, the tape recorder pause circuit according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a circuit diagram showing an embodiment of a pause circuit of a tape recorder according to the present invention, in which 1 is a microphone, 2 is a circuit diagram that amplifies the output signal of the microphone 1, and sends the output signal to the output terminal OUT. This is an amplifier that supplies data to a recording section of a tape recorder (not shown) via the amplifier.

3 is an A/D converter circuit that converts the level of the analog output signal output from the amplifier 2 into a digital signal; 4 is a circuit that compares the output signal of the A/D converter circuit 3 with a reference signal, and determines whether the level of the analog output signal output from the amplifier 2 is greater than the reference signal; A comparator circuit that generates an output only when an input signal of ing.

5 is a Nant gate, and one side input terminal of this Nant gate 5 is connected to the power supply VCC and the switch S2 via a resistor R1.
are respectively connected to the comparator circuit 4 through the terminals, and the other input terminal is connected to the common connection a of the temporary stop switch S1.

6 is a switching circuit controlled by the output of the Nant gate 5, and this switching circuit 6 is connected to the power supply +
Controls on/off of the power supplied from vCC to the capstan motor 8 via the motor drive circuit 7.

As shown in FIG. 1, for example, this switching circuit 6 includes a transistor Q1 whose base input is the output of the Nant gate 5 via a resistor R2, a transistor Q2 whose base input is the output of the transistor Q1, and a Darlington transistor Q2. It is constituted by a transistor Q3 and the like that are connected and control on/off of the power supply supplied to the motor drive circuit 7.

In the pause circuit of the tape recorder configured as described above, when the pause switch S1 and the switch S2 are in the illustrated state, the force of both the Nantes gate 5 is "H1".
? level, and accordingly, the output of the Nant gate 5 becomes "L".

As a result, the first stage transistor Q1 constituting the switching circuit 6 is turned off, and the transistor Q2 whose base input is the output of this transistor Q1 is turned on.

When transistor Q2 is turned on, this transistor Q
The transistor Q3 connected to the motor 2 in a Darlington manner is turned on, and accordingly, the power supply element 2CC is supplied to the motor drive circuit 7.

When power is supplied via the switching circuit 6, the motor drive circuit 7 drives and controls the capstan motor 8 to rotate at a constant speed to run the tape at a stable speed, and the microphone 1
The audio input signal collected by the amplifier 2 and amplified by the amplifier 2 is recorded on a magnetic tape.

Next, when the pause switch S1 is manually operated and the common contact a is connected to the normal cross contact C, one side input terminal of the Nantes gate 5 is connected to the ground via the pause switch S1. .

As a result, the output signal of the Nant gate 5 becomes "H",
Accordingly, the switching circuit 6 is turned off to stop the rotation of the capstan motor 8, thereby temporarily stopping the recording state.

Then, when the operation of the pause switch S0 is restored,
The output of the Nant gate 5 is restored to "L" again and the switching circuit 6 is turned on, thereby causing the capstan motor 8 to rotate again and enter the recording state.

Next, the automatic pause operation of recording, which is the gist of the present invention, will be explained.

When performing this automatic recording pause operation, first turn on the switch S2.

When the tape recorder is set to the recording mode in this state, the signal collected by the microphone 1 is supplied to the output terminal OUT via the amplifier 2, and is recorded on a magnetic tape via a recorder (not shown).

In this case, the analog audio signal output from the amplifier 2 as shown in FIG. 2A is converted into a corresponding digital signal in the A/D converter 3 and output to the comparator 4 as shown in FIG. be done.

Comparator 4 sets the reference value (
The digital signal supplied from the A/D converter 3 and the reference value are compared,
Figure 2 C only when an input signal higher than the reference value is supplied.
Outputs the "H" level output signal shown in .

Therefore, when the audio input signal is small, that is, below the reference value, the comparator 4 outputs an L" level output signal.

Therefore, when there is a weak input audio signal or no input audio signal during recording, the output of the comparator 4 becomes "L91".

This "L?!" signal is supplied to one side input terminal of the Nandts gate 5 via the switch S2, whereby the output signal of the Nandts gate 5 becomes "H".

As a result, the switching circuit 6 is turned off as in the case described above, thereby stopping the operation of the capstan motor 8 and interrupting the recording state.

Next, when the input audio signal becomes equal to or higher than the reference value, the output of the comparator 4 becomes "H", and accordingly, the output of the Nantes gate 5 becomes "L".

When the output of the Nant gate 5 becomes L, the switching circuit 6 is turned on and the capstan motor 8 rotates again, thereby restoring the recording state.

Note that the reference value of the comparator 4 may be set each time depending on the state, and by appropriately setting this reference value, substantially long-term recording can be performed.

Furthermore, since the temporary stop switch S1 is provided separately from the system that inputs the comparator 4 of the Nantes Gate 5, it has priority over all other systems, and if the temporary stop switch S1 is operated in any state, the capstan motor 8 stops.

As explained above, the tape recorder pause circuit according to the present invention includes a manually controlled pause switch, a comparator that compares the recording signal with a reference value in the recording mode, and an output of the comparator. and a switching circuit that is controlled by the output of the theoretical product circuit and supplies driving power to the capstan motor, and the temporary stop switch is in an inactive state. In the recording mode, when the recording signal is below the reference value, the capstan motor is automatically stopped, and when the recording signal is above the reference value, the capstan heater is automatically changed from the stopped state to the recording state, and the capstan motor is automatically stopped when the recording signal is below the reference value. In the case of an operation mode in which the stun motor is rotated, the capstan motor is stopped by operating the temporary stop switch.

Therefore, recording can be paused fully automatically, making the recording operation extremely simple.

In addition, by appropriately setting the standard value, it is possible to eliminate unattended recordings, and this makes it virtually possible to record for a long time, such as recording conversations where there is no problem with some sound dropout at the beginning of the start. It is extremely effective.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of a temporary stop circuit for a tape recorder according to the present invention, and FIGS. 2A to 2C are operation waveform diagrams of various parts of the circuit shown in FIG. 1. 1...Microphone, 2...Amplifier, 3...A/D converter, 4...Comparator, 5...Nandt gate, 6...
・Switching circuit, 7...Motor drive circuit, 8...
・Capstan motor, 9...temporary stop switch, S
2...Switch, R1, R2...Resistor, Q1~Q3
...transistor.

Claims (1)

[Scope of utility model registration request] a pause switch controlled by manual operation; a comparator for comparing a recording signal in recording mode with a reference value; a theoretical product circuit inputting the output of the comparator and the output of the pause switch, respectively; and a switching circuit that is controlled by the output of the theoretical product circuit and supplies drive power to the capstan motor, and when the above-mentioned pause switch is in the inactive state and the recording mode is in effect, the above-mentioned switching circuit automatically stops when the recording signal is below the reference value. When the capstan motor is stopped and the recording signal is above the standard, the capstan motor is automatically changed from the stopped state to the recording state, and in the case of an operation mode in which the capstan motor is rotated, operation of the pause switch. A temporary stop circuit for a tape recorder, characterized in that it is configured to stop the capstan motor.