JP2830021B2 - Remote control circuit - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote control circuit for audio equipment using headphones.

2. Description of the Related Art FIG. 4 is a headphone stereo connection diagram provided with a conventional remote control circuit. In the figure, a is a remote control operation unit, b is a main unit, D1 is a light emitting diode for confirming the operation of the main unit b, SW1 is an operation switch of the remote control operation unit a, R1 is a current limiting resistor of the light emitting diode D1. , C is an input signal level judging circuit for judging an input signal level closed by opening and closing the operation switch SW1, and R3 is an input side pull-up resistor of the input signal level judging circuit c. Reference numeral d denotes an LED amplifier control circuit for controlling the transistor Q1 based on the output signal of the input signal level determination circuit c to turn on / off the light emitting diode D1 and the amplifier i. The transistor Q1 controls the switching of the light emitting diode D1 by the output of the LED amplifier control circuit d. R2 is a base resistance of the switching transistor Q1, e is a power supply of the main body, h is a headphone, and i is an amplifier.

 The operation will be described below.

First, when the power supply e is connected to the main body b, the input of the input signal level determination circuit c is pulled up by R3,
The amplifier control circuit d is in the OFF state, the transistor Q1 is cut off, and the light emitting diode D1 is also turned off. Here, when the operation switch SW1 of the remote control operation unit a is closed, a low level is input to the input signal level determination circuit c. Then, the LED amplifier control circuit d operates according to the output signal of the input signal level determination circuit c to which the low level has been input, the transistor Q1 is forward-biased by the output of the control circuit d and turns on, and the light emitting diode D1 lights up. The power is also supplied to the amplifier i, and the fact that the main body b is in the operating state is displayed.

Problems to be Solved by the Invention However, in the above-described conventional remote control circuit,
In order to attach the LED for checking the operation status of the main unit, a dedicated connection is required between the main unit and the remote control operation unit, the wiring between the main unit and the remote control operation unit becomes thick, and it is not easy to use as a remote control for portable audio products Become something.
Further, if the wiring material between the main body and the remote controller is made thinner with priority given to ease of use, there is a problem that the frequency of disconnection increases, which causes a reduction in reliability.

The present invention is to solve such a conventional problem, and it is possible to confirm the operation state of the main unit by lighting the light emitting diode of the remote control unit without increasing the number of wires between the main unit and the remote control unit. It is an object of the present invention to provide an excellent remote control circuit that can be used.

Means for Solving the Problems In order to solve the above problems, a remote control circuit of the present invention comprises:
In the middle part of the headphone cord, a remote control operation switch comprising a remote control operation switch and a light emitting diode connected in parallel to the remote control operation switch is provided, and the main body has both ends of the remote control operation switch when the remote control operation switch is opened and closed. A voltage level determination circuit for detecting a voltage change; and a power supply circuit for lighting the light emitting diode whose output is started based on the detection of the voltage change by the voltage level determination circuit. Connected.

Function The remote control circuit of the present invention is a power supply circuit for lighting the light emitting diode of the main body, which can light the light emitting diode connected in parallel with the remote control operation switch. By judging the voltage change by the voltage level judgment circuit of the main body, a remote control input signal can be taken. That is, the light emitting diode can be turned on without adding a wiring between the main body and the remote control operation unit, and an input signal of the remote control can be taken in.

Embodiment Hereinafter, a remote control circuit according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a headphone stereo circuit using a remote control circuit according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a remote control operation unit including a remote control operation switch SW1 and a light emitting diode D1, reference numeral 2 denotes a main unit, reference numeral 3 denotes a power supply
Is a headphone, and 5 is an audio amplifier. R1 is a current limiting resistor of the light emitting diode D1, 6 is a voltage level determining circuit including resistors R2 and R4 and a transistor Q2, 7 is a remote control input processing circuit, 8 is an amplifier 5 and a power supply circuit for lighting the light emitting diode. Remote control input processing circuit 7
Is turned ON or OFF by the output of. Reference numeral 9 denotes a power supply starting circuit including resistors R5 and R6 and a transistor Q1. R3 is a pull-up resistor for the remote control input processing circuit input.

The operation of the remote control circuit configured as described above will be described below.

First, when the power supply 3 is still applied, since the remote control operation switch SW1 of the remote control operation unit 1 is open, the transistors Q1 and Q2 remain OFF, and the outputs of the remote control input processing circuit 7 and the power supply circuit 8 are output. Is OFF and the amplifier 5
Does not operate, and the light emitting diode D1 does not light. Next, when the remote control operation switch SW1 is closed, the transistor Q1
Is turned on by applying a forward bias through the resistors R6 and R1. Then, the transistor Q2 is also biased in the forward direction through the transistor Q1 and the resistor R5 to be turned ON. Therefore resistance R3
The input section of the remote control input processing circuit 7, which has been pulled up by the above, is kept at a low level while the remote control operation switch SW1 is closed. Next, the remote controller input processing circuit 7 determines whether an input signal is present, and the amplifier and the light emitting diode power supply circuit 8 are started. Then, a voltage is applied to the light emitting diode D1 and the light emitting diode D1 is applied.
Lights up, and the amplifier 5 also operates. At this time, if the voltage of the amplifier and the light emitting diode lighting power supply circuit 8 is set higher than the main power supply 3, the transistor Q1 is reverse biased and cut.
It turns off. In this state, the voltage generated at the resistor R1 adjusts the ratio of the resistors R2 and R4 to set the transistor Q2 to the OFF state.

When the remote control operation SW1 is further closed while the light emitting diode D1 is turned on, the voltage of the amplifier and the light emitting diode lighting power supply circuit 8 is generated across the resistor R1, and the voltage of the resistor R2 is
The voltage divided by R4 is applied to the transistor Q2 to turn on the transistor Q2, and the remote control input processing circuit 7 inputs the ON state of the remote control operation switch.

That is, according to the present embodiment, the main unit 2 and the remote control operation unit 1 are connected by two wires excluding the circuit wiring of the headphones 4, and the light emitting diode D 1 is connected in parallel to the remote control operation switch SW 1. By providing the light emitting diode lighting power supply circuit 8, the operating state of the main body 2 can be confirmed by the light emitting diode D1 of the remote control operation unit 1, and the voltage level determining circuit 6 allows the light emitting diode D1 to be turned on or off, regardless of whether the light emitting diode D1 is turned on or off. The remote control input signal generated by opening and closing the remote control operation switch SW1 can be input to the remote control input processing circuit SW1, and the operation state of the main unit 2 can be remotely controlled without increasing the number of wires from the main unit 2 to the remote control operation unit 1. You can find out in Part 1. Furthermore, the main body 2
Since the light emitting diode is turned off while the remote control operation switch SW1 is closed during operation, the operation of the operation switch SW1 can be visually confirmed.

FIG. 2 is an external perspective view, in which a headphone jack 10 provided in the headphone stereo main body 2 is provided with the above-described remote control operating section 1 in the middle of the cord 11 of the headphone 4, and a headphone plug 12 is provided at the tip. By connecting the headphone plug 12 to the headphone jack, the circuit configuration shown in FIG. 1 is established. In FIG. 1, the headphone jack 10 and the plug 12 are omitted.

In the above embodiment, the operation switch is
Although an example in which only one SW1 is provided is shown, as shown in FIG. 3, by adding a resistor R7 and a second operation switch SW2, when the second operation switch SW2 is pressed, both switches SW1 , SW2 are both OFF and the first operation switch
It is also possible to take out an intermediate voltage when SW1 is pressed. Therefore, as shown in FIG. 3, by using two sets of voltage level judging circuits 6a and 6b having different judgment levels for the main body 2, two types of voltage between the main body 2 and the remote controller 1 can be provided without increasing the number of wirings. Remote control signal can be used.

Effects of the Invention As described above, the present invention provides a
A remote control unit comprising a remote control switch and a light emitting diode connected in parallel to the remote control switch. The main unit has a voltage level for detecting a voltage change across the remote control switch when the remote control switch is opened and closed. The determination circuit and the power supply circuit for lighting the light emitting diode, the output of which is started based on the detection of a voltage change by the voltage level determination circuit, include a main body unit and a remote control operation unit excluding the headphone wiring. With two wires, the operating state of the main body can be displayed by a light emitting diode, and an input signal corresponding to a remote control operation can be obtained, which is very effective.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a remote control circuit according to an embodiment of the present invention, FIG. 2 is a perspective view of the same, FIG. 3 is a circuit diagram showing another embodiment, and FIG. 4 is a circuit diagram of a conventional example. 1 Remote control operation unit, SW1 Remote control operation switch, D1 Main body operation display light emitting diode, 6 Voltage level determination circuit, 8 Power supply circuit for amplifier and LED lighting.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04R 3/00 310 G11B 15/10 511

Claims (1)

(57) [Claims] 1. A remote control operation unit comprising a remote control operation switch and a light-emitting diode connected in parallel to the remote control operation switch in an intermediate portion of the headphone cord, and a main body includes a remote control operation switch for opening and closing the remote control operation switch. A voltage level determination circuit for detecting a voltage change at both ends of the remote control operation switch; and a power supply circuit for lighting the light emitting diode, the output of which is activated based on the detection of the voltage change by the voltage level determination circuit; And a main unit connected to the main body.