JPH02248195A - Remote control circuit - Google Patents

Abstract

PURPOSE:To obtain with excellent operation convenience and with high reliability by providing a required remote control operation section to a headphone code intermediate section and providing a voltage level deciding circuit to a main body section. CONSTITUTION:When a remote control switch SW1 of a remote control section 1 connecting to an intermediate section between a headphone 4 and a main body section 2 is turned on, a transistor(TR) Q1 of the main body section 2 is turned on, a TR Q2 is turned on and an LEDD1 connected in parallel with the switch SW1 is lighted to confirm the supply of a power supply 3 to the main body section 2. Moreover, a voltage level deciding circuit 6 of the main body section 2 inputs a remote control input signal by the switching of the switch SW1 is inputted to a remote control input processing circuit 7 independently of lighting/nonlighting of the LEDD1 and the operating state of the main body section 2 is recognized by the operation section 1 without increasing the number of wires from the main body section 2 to the operation section 1 and a remote control circuit for an audio equipment using the headphone with operation convenience and high reliability is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a remote control circuit for audio equipment using headphones.

Prior Art FIG. 4 is a wiring diagram of a headphone stereo equipped with a remote control circuit according to the prior art. In the same figure, 2 /\-, a is the remote control operation part, b is the main body part, Dl is a light emitting diode for checking the operation of the main body part, SWl is the operation switch of the above remote control operation part a, and R1 is the above-mentioned Current limiting resistor of light emitting diode D1, C is the above operation switch SW1
R3 is an input side pull-up resistor of the input signal level determining circuit C. d is an LED amplifier control circuit, which controls the transistor Q1 by the output signal of the input signal level determination circuit C, and controls the light emitting diode D.
1 and amplifier i are turned ON10FF. The transistor Q1 controls the switching of the light emitting diode D1 based on the output of the LED amplifier control circuit d. R2 is the base resistance of the switching transistor Q1, e is the main power supply, h is the headphones, and i is the amplifier.

The operation will be explained below.

First, when the power supply e is connected to the main body, the input of the input signal level determination circuit C is pulled up by R3, the LED amplifier control circuit d is in the OFF state, and the transistor Q1 is also cut off. Light emitting diode D is turned off
1 is also off. Here, when the operation switch SW1 of the remote control operation section a is closed, a low level is input to the input signal level determination circuit C. Then, due to the output signal of the input signal level determination circuit C which inputs the low level, the LE
The D amplifier control circuit d operates, and the transistor Q1 is forward biased and turned ON by the output of the control circuit d, the light emitting diode D1 lights up, power is also supplied to the amplifier i, and the main body becomes operational. It shows what has happened.

Problems to be Solved by the Invention However, in the conventional remote control circuit described above, in order to attach an LED for checking the operation status of the main body, a dedicated connection is required between the main body and the remote control operation section, and the connection between the main body and the remote control operation section is difficult. The wiring becomes thick, making it difficult to use as a remote control for portable audio products. Furthermore, if the wiring material between the main body and the remote control is made thinner in order to give priority to ease of use, there is a problem in that the frequency of wire breakage increases, resulting in a decrease in reliability.

The present invention solves these conventional problems,
The object of the present invention is to provide an excellent remote control circuit that allows the operating status of the main unit to be confirmed 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. be.

Means for Solving the Problems In order to solve the above problems, the remote control circuit of the present invention includes a remote control operation section in which a light emitting diode is connected in parallel with a remote control operation switch, and a power supply circuit for lighting the light emitting diode in the main body. and a voltage level determination circuit that detects voltage changes across the remote control switch due to opening and closing of the remote control switch.

Operation The remote control circuit of the present invention is a power supply circuit for lighting the light emitting diode in the main body, and is capable of lighting the light emitting diode connected in parallel with the remote control operation switch, and can perform the above operations by opening and closing the operation switch. A remote control input signal can be input by determining the voltage level determination circuit in the main body of the switch by determining the voltage change at both ends of the switch. That is, the light emitting diode can be turned on without adding any wiring between the main body and the remote control operation section, and input signals from the remote control can also be taken in.

Embodiments Hereinafter, remote control circuits according to embodiments of the present invention will be explained 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 Figure 1,
1 is a remote control operation section consisting of a remote control operation SW1 and a light emitting diode D1; 2 is a main body; 3 is a power source for the main body 2; 4
is a headphone, and 5 is an audio amplifier. R1 is the current limiting resistor of the light emitting diode D1, 6 is the resistor R2,
A voltage level determination circuit consisting of R4 and a transistor Q2, 7 a remote control input processing circuit, and 8 a power supply circuit for the amplifier 5 and light emitting diode lighting, which are turned on or off by the output of the remote control input processing circuit 7. It will be turned off. 9 is a power supply starting circuit consisting of resistors R5 and R6 and a transistor Q1. R3 is a pull-up resistor for the input of the remote control input processing circuit.

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

First, when power supply 3 is applied, transistors Q1 and Q
2 remains OFF, the amplifier 5 does not operate, and the light emitting diode D1 does not light up. Next, when the remote control operation switch SW1 is closed, the transistor Q1 is connected to the resistor R6 and R1.
Through this, a forward bias is applied and turned on. Then, transistor Q1. Transistor Q2 is also forward biased and turned on through resistor R5. Therefore resistance R3
The input section of the remote control input processing circuit 7, which has been pulled up by the above, is maintained at the frontage level when the remote control operation switch SW1 is closed. Next, the presence of an input signal is determined in the remote control input processing circuit 7, and the amplifier and light emitting diode lighting power source 8 are activated. Then, a voltage is applied to the light emitting diode 7, and the light emitting diode D1 lights up.
Amplifier 5 also operates. At this time, if the voltage of the amplifier and light emitting diode lighting power supply 8 is set higher than the main power supply 3,
Transistor Q1 is reverse biased and is in a cut-off state. The voltage generated across the resistor R1 in this state is set to turn off the transistor Q2 by adjusting the ratio between the resistors R2 and R4.

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

That is, according to this embodiment, the main body section 2 and the remote control operation section 1
are connected with two wires excluding the circuit wiring of the headphones 4, a light emitting diode D1 is connected in parallel to the remote control operation switch SW1, and a light emitting diode lighting power source is provided in the main body 20, so that the operating state of the main body 2 can be controlled by the remote control. This can be confirmed by the light-emitting diode D1 in section 1, and the voltage repe)v judgment circuit 6 converts the remote control input signal generated by opening and closing of the remote control operation switch SW1 to the remote control input processing circuit, regardless of whether the light emitting diode D1 is lit or not. It can be input to SW1, and can be input from main unit 2 to remote control operation unit 1.
The operating state of the main body part 2 can be known from the remote control operation part 1 without increasing the number of wires. Furthermore, since the developed photodiode that closes the remote control operation switch SW1 is turned off while the main unit 2 is operating, the operation switch SW1 is turned off.
You can visually confirm the operation of 1.

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-mentioned remote control operation part 1 in the middle of the cord 11 of the headphones 4, and a headphone plug 12 is provided at the tip. By connecting this headphone plug 12 to the headphone jack, the circuit configuration shown in FIG. 1 is established. In addition, the first
In the figure, the headphone jack 1o and plug 12 are omitted.

In the embodiment above 9 vanes, the remote control operation section 1 includes an operation switch S.
Although the example in which only one W1 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 5W1SW2 It is also possible to extract an intermediate voltage between when both are OFF and when the first operation switch SW1 is pressed. Therefore, as shown in FIG.
There are two sets of voltage level determination circuits ea with different determination levels.
, sb, it becomes possible to use two types of remote control signals without increasing the wiring between the main body section 2 and the remote control operation section 1.

Effects of the Invention As described above, the present invention includes a remote control operation switch provided in the middle part of the headphone cord, a light emitting diode connected in parallel to the switch, a power source for lighting the light emitting diode in the main body, and a remote control switch. Equipped with a voltage level judgment circuit that detects voltage changes at both ends of the remote control operation switch due to opening and closing of the operation switch, the wiring between the main unit and the remote control operation unit can be reduced to two, excluding the headphone wiring. The operating status of the main unit can be displayed using a light emitting diode, and input signals can be obtained in response to remote control operations, making it very effective.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a remote control circuit according to an embodiment of the present invention, FIG. 2 is an external 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 section, SWl... Remote control operation switch, Dl... Light emitting diode for displaying main unit operation, 6... Voltage level determination circuit, 8...
- Power supply for amplifier and LED lighting. Name of agent Patent attorney Shigetaka Awano and one other person absent

Claims (1)

[Claims] The middle part of the headphone cord is equipped with a remote control operation section consisting of a remote control operation switch and a light emitting diode connected in parallel to the remote control operation switch, and the main body includes a power supply circuit for lighting the light emitting diode and the remote control. A remote control circuit comprising: a voltage level determination circuit for detecting a voltage change at both ends of a remote control operation switch when the operation switch is opened/closed; and the remote control operation section and the main body section are connected.