JPS6223381B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an audio device such as a tape recorder, and its purpose is to insert a switch into the signal line of a headphone or earphone connected to the audio device, and use this switch to operate the device. The goal is to make it possible to control.

2. Description of the Related Art In recent years, audio equipment such as radio receivers and tape recorders have become smaller and lighter, and people are now putting them in their clothing pockets and listening to music through headphones or earphones. However,
If you are listening to music with the device in your pocket, and you want to turn off the power or temporarily stop the tape from running, you will have to take the device out of your pocket each time to operate it, which is a hassle. It was hot.

The present invention overcomes these conventional drawbacks.

An embodiment of the present invention will be described below with reference to the drawings, taking a tape recorder as an example.

An input signal such as a tape playback signal inputted to an input terminal a is amplified by an amplifier 1, and its output signal is supplied to an A contact of an output jack 3 through a coupling capacitor 2. When the plug 4 is not inserted into the output jack 3, the A and B contacts of the output jack 3 are connected, and the A contact is grounded via a resistor 6 connected to the B contact. Further, the A contact of the output jack 3 is connected to the power supply E via a resistor 7 and is grounded via a resistor 8, and a series circuit of a resistor 9 and a capacitor 10 is connected between the A contact and the ground. It is connected. On the other hand, a series circuit consisting of a tape running motor 11, the collector and emitter of a transistor 12 is connected between the power supply E and the ground, and the base of the transistor 12 is connected to the collector of a transistor 13 and is connected via a resistor 14. The transistor 13 is connected to a power source E, its emitter is grounded, and its base is connected to the connection point between the resistor 9 and the capacitor 10.

The plug 4 is connected to a switch 15 and a headphone 1.
6 series circuits are connected. Note that the C contact of the output jack 3 is grounded.

With the above configuration, when the plug 4 is not inserted into the output jack 3, power is supplied to the A contact via the resistor 7, but the A contact is grounded by the resistors 6 and 8. Because there are
At the potential of the A contact, the base of the transistor 13 is at a low potential, so that the transistor 13 is not conductive, and since it is in a non-conductive state, the transistor 12 is conductive, and the motor 11 is energized to run the tape.

Therefore, when the plug 4 is not inserted, the signal input to the input terminal a can be supplied to an external device from, for example, an output terminal separately connected to the A contact of the output jack 3.

Next, the case where the plug 4 is inserted into the output jack 3 will be explained. When the plug 4 is inserted, the A and B contacts are open, so if the switch 15 is currently closed, the A contact of the output jack 3 is grounded by the internal impedance of the headphone 16 and the resistor 8. As a result, the A contact becomes low potential, transistor 13 becomes non-conducting, transistor 12 becomes conductive, and the motor 11 is driven to run the tape. The user can then listen to the tape playback sound through the headphone 16.

With this tape recorder in operation, switch 1
When 5 is opened, the impedance between the A contact of the output jack 3 and the ground increases, so the potential of the A contact becomes a potential determined only by the voltage division ratio of the resistors 7 and 8, and the potential is as follows in the above case. Since the potential is relatively high, the transistor 13 becomes conductive, and the transistor 12 becomes non-conductive, cutting off the power to the motor 11. The rotation of the motor 11 is stopped, and therefore the tape running is also stopped.

In this way, the running of the tape can be controlled by the switch 15 connected in series to the signal line of the headphone 16.

Note that the capacitor 10 is provided to prevent the base potential of the transistor 13 from changing due to the output signal of the amplifier 1.

Although this embodiment has been explained using a tape recorder as an example, it may also be used to temporarily cut off the power to other equipment, such as a radio receiver, or it may be used to control other equipment. good. The same applies even if the headphone is an earphone.

As described above, the present invention allows a switch to be inserted into the signal line of a headphone or earphone connected to the output side of an audio device, and allows the switch to control the operation of the audio device. For example, even when an audio device is placed in a pocket of clothing and listened to music through a headphone or the like, by providing a switch in the headphone section, the operation of the audio device can be easily controlled without having to take the audio device out of the pocket one by one. Furthermore, since the switch is inserted directly into the signal line of the headphone or the like, there is no need for a dedicated control line for the switch, so the configuration is simple and inexpensive, and its effects are great.

[Brief explanation of the drawing]

The drawing is a circuit diagram showing an embodiment of the present invention. a...Input terminal, 1...Amplifier, 3...Output jack, 4...Plug, 11...Motor, 12,
13...transistor, 15...switch, 16
...Headphone.

Claims (1)

[Claims] 1 Headphones or earphones that have a switch inserted into the signal line and are plugged into or removed from an output jack connected to the output side of the audio equipment;
a first resistor that is connected to and separated from the output side of the audio equipment in response to insertion and removal of the plug into the output jack; and a first resistor that is connected to the output side of the audio equipment in a parallel relationship with the first resistor. A second resistor and an internal impedance of the headphone or earphone connected to the output side of the audio equipment in a parallel relationship with the second resistor when the plug is inserted into the output jack. , a detection means for detecting a voltage change caused by a change in parallel impedance between the second resistor and the internal impedance due to opening/closing of the switch; and a detection means operated based on the detection result of the detection means due to opening/closing of the switch; An audio device comprising switching circuit means for controlling the operation of the audio device.