JPS5813474Y2 - Tape recorder muting circuit - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a muting circuit in a tape recorder for cutting off a human input signal supplied to a recording head, and particularly provides such a muting circuit that is operated in conjunction with a pause switch. It is something to do.

When recording with a tape recorder, when a desired length of non-signal portion is provided on the tape, the recording volume is generally reduced each time to cut off the input signal supplied to the recording head.

In order to avoid such trouble, conventionally, when the pause button is operated, the input signal is cut off, and the tape is allowed to run steadily for a predetermined period of time, for example, about 2 to 8 seconds, and then stopped, thereby creating a no-signal area on the tape. A tape recorder has been proposed.

However, in this tape recorder, it is not possible to freely control the length of the no-signal portion, that is, the muting time of the input signal, which is inconvenient in actual use.

The purpose of the present invention is to eliminate the above-mentioned drawbacks by associating a muting switch with a pause switch so that when the pause switch is operated while muting is being performed by the muting switch, , muting is canceled.

With this configuration, it is possible to perform NEETing for an arbitrary period of time by operating only the muting switch, and also to cancel muting by temporarily stopping the tape recorder after performing muting. Furthermore, normal recording can be performed when the pause is canceled.

Embodiments of the present invention will be described below with reference to the drawings.

In the drawing, 1 is a flip-flop circuit, which is composed of transistors 2, 3 and resistors 4, 5, 6, 7, diodes 8, 9, 10, resistors 11, 12, and capacitor 13. This includes a trigger circuit.

The circuit constants of this flip-flop circuit 1 are selected so that the transistor 3 is conductive in the initial state when a 10B power supply is supplied.

Reference numeral 14 denotes a □neeting switch, which uses a so-called non-locking button that closes when the button is pressed.

15 is a pause switch, which is the same as the tape recorder's pause button (
It is closed in conjunction with a temporary stop button (not shown), and a push-button button or a non-locking button is used.

16 is an input terminal for a human input signal, 17 is a recording amplifier, 18 is a recording head, and 19 is a muting transistor, the collector of which is connected to the input terminal 16 via a resistor 20.

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

When normal recording is being performed, transistor 2 is in a non-conducting state and transistor 3 is in a conducting state.

Therefore, the base potential of the transistor 19 connected to the collector of the transistor 3 is low, and the transistor 19 is in a non-conducting state.

The input signal applied to the input terminal 16 is applied to the recording amplifier 17 via the resistor 20 and amplified, and this amplified output is supplied to the recording head 18.

When the muting switch 14 is closed in the above recording state, the base potential of the transistor 3 is changed to the resistor 4 and the diode 8.
The potential of the flip-flop circuit 1 is inverted, transistor 2 becomes conductive, and transistor 3 becomes non-conductive.

Therefore, the base potential of transistor 190 rises, transistor 19 becomes conductive, and the input signal flows to ground through resistor 20 and the collector-emitter of transistor 19.

Therefore, the input signal supplied to the recording head 18 is cut off and muting is applied.

During this time, since the tape continues to run, a no-signal portion is formed on the tape due to the above muting.

Note that the diode 10 is used to maintain the terminal voltage of the capacitor 13 on the resistor 12 side at approximately the power supply voltage after the □ neating switch 14 is opened.

Next, when a no-signal portion of a desired length is formed, the muting switch 14 is closed again, and the transistor 2
0 base potential is resistor 5, diode 9 and capacitor 1
3, it momentarily becomes approximately ground potential.

As a result, the Noritub flop circuit 1 is inverted again, the transistor 2 becomes non-conductive, and the transistor 3 becomes conductive.

Therefore, the transistor 19 becomes non-conductive, muting is canceled, and the input signal is transferred to the resistor 20 and the recording amplifier 17.
The recording head 18 is supplied again through the recording head 18 to continue recording.

According to the above, by operating the muting switch 14 while the tape is running, a no-signal portion of any length can be formed at any one fixed location on the tape.

Next, in a state in which the above-mentioned muting is applied, that is, in a state in which transistor 2 is in a conductive state, transistor 3 is in a non-conductive state, and transistor 19 is in a conductive state, and the tape continues to run, a predetermined period of time has elapsed. When the pause button on the tape recorder is subsequently pressed, the running of the tape is stopped and the tape recorder is placed in a paused state.

At the same time, the pause switch 15 is linked to the pause button.
Since the transistor 190 is closed, the base of the transistor 190 is grounded, the transistor 19 becomes non-conductive, and □neating is canceled.

At the same time, the base potential of the transistor 20 becomes approximately ground potential through the resistor 5 and the pause switch 15, so the flip 70 toggle 1 is inverted, the transistor 2 becomes non-conductive, and the transistor 3 becomes conductive.

This maintains the non-conducting state of transistor 19.

According to the above, after the muting switch 14 is pressed to form a no-signal portion of a desired length, the tape recorder can be temporarily stopped in the non-muting state.

If you press the pause button in this paused state to release the pause, the tape starts running again, but at this time the flip 70 knob 1 maintains the above state, that is, transistor 2 is off and transistor 3 is on. As shown, the transistor 19 maintains a non-conducting state.

Therefore, muting is not applied and the tape recorder enters the normal recording state.

The present invention includes a muting switch 14, a flip-flop circuit 1 that is inverted by the operation of the muting switch 14, and a first operating state (1) in which an input signal is supplied to the magnetic head in accordance with the output of the flip-flop circuit 1. A muting means 19 is provided for switching between a recording state) and a second operating state (muting state) for cutting off the input signal, and a pause switch 15 is provided for temporarily stopping the magnetic tape to enter a pause state. , by associating the pause switch 15 with the seven flip-flop circuit 1 and placing the pause switch 15 in the pause state when the muting circuit 1 is in the second operating state, the flip-flop The present invention relates to a muting circuit for a tape recorder, characterized in that the muting means 19 is switched to the first operating state by inverting the circuit 1.

Therefore, according to the present invention, muting can be performed for an arbitrary period of time by operating only the muting switch, and after performing muting for an arbitrary period of time, the tape recorder can be temporarily stopped and the muting switch can be operated. It is extremely convenient to use, as muting can be canceled without interruption, and when the pause is canceled, the normal recording state can be resumed. It is effective when used in cases.

[Brief explanation of drawings]

The drawing is a circuit diagram showing an embodiment of the present invention. In addition, in the symbols used in the drawings, 1 is a flip-flop circuit, 14 is a muting switch, 15 is a pause switch, 16 is an input terminal, 17 is a recording amplifier,
19 is a muting transistor.

Claims (1)

[Scope of utility model registration request] a muting switch; a flip-flop circuit that is inverted by the operation of the muting switch; a first operating state in which an input signal is supplied to the magnetic head according to the output of the flip-flop circuit; and a second operating state in which the input signal is cut off. A muting means that can be switched to the operating state of By setting the pause switch to the pause state when the muting means is in the second operating state, the flip-flop circuit is inverted and the muting means is switched to the first operating state. □ NEETING circuit of a tape recorder featuring the following.