JPH0729246A - Remote control controller - Google Patents

Abstract

PURPOSE:To enable remote control operation while making a connector part four pins by holding an output side line of a headphone to fixed potential different from the ground and using it as a voltage supply line for remote control. CONSTITUTION:One side signal lines of the headphones 8, 9 are connected to sound output lines 1, 2 through connection pins 71, 72 of a connector part 7 and driving amplifiers 3, 4. The other signal lines are connected to an amplifier 5 through the connection pin 73, and to one side terminals of operation switches 10-13 for remote control, and the other terminals of the switches 10-13 are connected to a control circuit 14 through the connection pin 74. At this time, since a voltage dividing power source +B by resistors R1, R2 is supplied as power source for remote control, and becomes the output voltage of the amplifier 5 and the operation reference voltages of the amplifiers 3, 4, no DC current flows through the headphones in spite of no coupling capacitor. Thus, the remote control operation is performed while making the connector part four pins even in a direct connection amplifier system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote control control device for an audio device having a headphone connected to a device body and a control function for controlling the operation of the device body, such as a compact cassette headphone stereo and a portable CD player. , Portable DA
Used for audio equipment such as T and portable mini disc players.

[0002]

2. Description of the Related Art Conventionally, there has been proposed an audio device in which headphones connected to a device body have a control function for controlling the operation of the device body.

FIG. 2 is a circuit diagram showing an example of such a conventional remote control controller for audio equipment.

This device fixes one line of the audio signal to the ground potential and uses this potential together with the ground potential of the remote control circuit.

That is, the audio output lines 44 and 45 for outputting the audio signals of the L channel and the R channel reproduced from a recording medium (not shown) are connected to the drive amplifiers 21 and 22 provided corresponding to the respective channels. The outputs of the drive amplifiers 21 and 22 are connected to the connection pins 251 and 252 of the connector section 25 provided in the main body case (not shown) via the coupling capacitors 23 and 24 for removing the DC component. ing.

Each connection pin 251, 25 of the connector section 25
2, one signal line of each of the L channel and R channel headphones 26, 27 is connected, and the other signal line is connected to the connection pin 2 of the connector section 25.
It is connected to the circuit ground and the main body case via 53. The stability of the circuit operation is secured by connecting the body case to the circuit ground.

The other signal line of each of the headphones 26 and 27 is provided with an operation switch for each remote controller (in this embodiment, four operation switches for remote controller are shown) 28.
To 31 of one terminal. The other terminal of the remote control operation switch 28 is connected to the connection pin 254 of the connector section 5, and the other terminal of the remote control operation switch 29 is connected to the connector section 5 via the resistor R12.
Is connected to the connection pin 254 of the remote controller operation switch 30 and the other terminal of the remote control operation switch 30 is connected to the connection pin 254 of the connector section 5 via the resistors R12 and R13. Resistors R12, R
It is connected to the connection pin 254 of the connector part 5 via 13 and R14.

Then, the connection pin 254 of the connector portion 25
Is connected to the power source + B via a resistor R11 and controls the operation of the main body.
Connected to 2.

The remote control operation switches 28 to 31 are switches for performing various operations such as start, stop, fast forward, and rewind of the recording medium.

This remote control control device is operated by a power source such as a dry battery, and has a single power source represented by a circuit ground and a power source + B.

The remote control control device having the above structure operates as follows.

The control voltage applied to the control circuit 32 changes depending on the states of the remote control operation switches 28 to 31. That is, the input impedance of the control circuit 23 is the resistances R11, R12, R13, R14.
Assuming that the control voltage is sufficiently high as compared with the above, the control voltage applied to the control circuit 32 is + B when none of the remote control operation switches 28 to 31 is pressed.

When the remote control operation switch 28 is pressed, the control voltage applied to the control circuit 32 becomes the circuit ground potential, and when the remote control operation switch 29 is pressed, the control voltage applied to the control circuit 32 is (+ B). ) × [R12 / (R11 + R12)], and when the remote control operation switch 30 is pressed, the control voltage applied to the control circuit 32 is (+ B) ×
[(R12 + R13) / (R11 + R12 + R13)]
When the remote control operation switch 31 is pressed, the control voltage applied to the control circuit 32 is (+ B) ×
[(R12 + R13 + R14) / (R11 + R12 + R
13 + R14)].

The control circuit 32 detects the change in the control voltage with a comparator or an analog-digital converter, thereby operating the remote control switches 28 to 28.
It is possible to know the state of 31 and to control the operation of the main body.

[0015]

As described above, in the circuit system of the conventional remote control control device described above,
It is necessary to connect coupling capacitors 23 and 24 for removing DC components to the outputs of the drive amplifiers 21 and 22, respectively. Therefore, the problem that the sound quality deteriorates,
There is a problem that it is difficult to downsize the device body because the coupling capacitors 23 and 24 have large capacities.

Therefore, this coupling capacitor 2
In order to eliminate 3, 24, the direct connection amplifier system has been conventionally adopted. However, in this conventional direct-coupled amplifier system, the potential of the common terminal of the headphones is not the ground potential of the circuit, so it is necessary to add 1 pin to the connector section to obtain 5 pins in order to obtain the ground potential required in the remote control circuit. However, there was a problem in terms of downsizing and simplification of the circuit configuration.

The present invention was devised to solve the above-mentioned problems, and an object thereof is to provide a remote control control device which is capable of remote control operation while leaving the connector portion as 4-pin even though it is a direct connection amplifier system. To do.

[0018]

In order to solve the above-mentioned problems, a remote control control device of the present invention is an audio device having headphones connected to the device body and having a control function for controlling the operation of the device body. The headphone output side line is kept at a constant potential different from the circuit ground, and this line output is used as a voltage supply line for remote control.

[0019]

In the single power source direct connection amplifier system, the output side line (common terminal) of each headphone has a constant DC voltage with respect to the circuit ground. Then, by supplying this DC voltage as a voltage for remote control,
By depressing the operation switch for each remote controller, this supply voltage is resistance-divided to generate each control voltage.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the circuit configuration of the remote control control device of the present invention.

In the figure, an audio output line 1 for outputting an audio signal of the L channel reproduced from a recording medium (not shown) is connected to an inverting input terminal of a drive amplifier 3 provided corresponding to the L channel via a resistor R7. The output of the drive amplifier 3 is connected to the connection pin 71 of the connector section 7 provided in the main body case (not shown) and fed back to the inverting input terminal via the resistor R8.

Further, the audio output line 2 for outputting the audio signal of the R channel is connected to the inverting input terminal of the drive amplifier 4 provided corresponding to the R channel through the resistor R9, and the audio output line 2 of the drive amplifier 4 is connected. The output is connected to the connection pin 72 of the connector section 7 and fed back to the inverting input terminal via the resistor R10.

The voltage divided by the resistors R1 and R2 connected in series between the power source + B and the circuit ground is
It is applied to the non-inverting input terminals of the drive amplifiers 3 and 4 and to the non-inverting input terminal of the amplifier 5 for creating the reference voltage. The output of the amplifier 5 is connected to the inverting input terminal and also to the case body and the connection pin 73 of the connector section 7.

The connection pins 71 of the connector section 7,
One signal line of each of the headphones 8 and 9 of the L channel and the R channel is connected to 72, and the other signal line is connected to the connection pin 73 of the connector section 7.
It is connected to the.

The connection pin 73 of the connector section 7 is connected to one terminal of each remote control operation switch (in this embodiment, four remote control operation switches are shown) 10 to 13. The other terminal of the remote control operation switch 10 is connected to the connection pin 74 of the connector section 7, and the other terminal of the remote control operation switch 11 is connected to the connection pin 74 of the connector section 7 via the resistor R4. The other terminal of the remote control operation switch 12 is connected to the connection pin 74 of the connector section 7 via the resistors R4 and R5.
The other terminal of the remote control operation switch 13 is connected to the connection pin 74 of the connector section 7 via resistors R4, R5 and R6.

The connection pin 74 of the connector section 7 is
It is connected to the circuit ground via a resistor R3 and is connected to a control circuit 14 that controls the operation of the main body.

The remote control operation switches 10 to 13 are switches for performing various operations such as start, stop, fast forward, and rewind of the recording medium.

That is, in the remote control control device of the present invention, the voltage obtained by dividing the single power source + B by the resistors R1 and R2 is connected to the non-inverting input terminal of the amplifier 5, and the output thereof is connected to the inverting input terminal. Therefore, the output voltage of the amplifier 5 becomes equal to the voltage divided by the resistors R1 and R2. Further, since the driving amplifiers 3 and 4 also operate with the voltage divided by the resistors R1 and R2 as a reference voltage, no DC current flows through the headphones 8 and 9 without a coupling capacitor. .

Next, the operation of the remote control control device having the above configuration will be described.

However, in this embodiment, it is assumed that the resistors R1 and R2 have the same value. That is, the output voltage of the amplifier 5 is (+ B / 2).

The control voltage applied to the control circuit 14 changes depending on the states of the remote control operation switches 10 to 13. That is, assuming that the input impedance of the control circuit 14 is sufficiently higher than the resistances R3, R4, R5, and R6, the remote control operation switches 10 to 10 are used.
Control circuit 1 when none of 13 is pressed
The control voltage applied to 4 is the circuit ground potential.

When the remote control operation switch 10 is pressed, the control voltage applied to the control circuit 14 becomes (+ B / 2), and when the remote control operation switch 11 is pressed, the control voltage applied to the control circuit 14 is changed. (+ B / 2) × [R3 / (R3 + R4)], and when the remote control operation switch 12 is pressed, the control voltage applied to the control circuit 14 is (+ B / 2) × [R3
/ (R3 + R4 + R5)], and when the remote control operation switch 13 is pressed, the control voltage applied to the control circuit 14 is (+ B / 2) × [R3 / (R3 + R4 +
R5 + R6)].

The control circuit 14 detects the change in the control voltage with a comparator or an analog-digital converter, and thereby the operation switches 10 to 10 for each remote controller are detected.
It is possible to know the state of 13 and control the operation of the main body.

Further, the connection pin 73 of the connector portion 7 is connected to the main body case. This means that the headphones 8,
It means that the potential of the output side common terminal of 9 is always the same as that of the main body case. This allows the headphones 8,
When the output terminals of 9 are connected to an external device, even if the main body cases of both devices come into contact with each other, this prevents the remote control control device from malfunctioning.

[0036]

The remote control control device of the present invention keeps the headphone output side line at a constant potential different from the circuit ground, and uses this line output as the voltage supply line for remote control, thereby The remote control operation can be reliably performed without increasing the number of connecting pins. Further, there is an effect that the size can be reduced and the circuit configuration can be simplified.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of a remote control control device of the present invention.

FIG. 2 is a circuit configuration diagram of a conventional remote control control device.

[Explanation of symbols]

 3,4 Drive amplifier 5 Amplifier 7 Connector section 8,9 Headphones 10, 11, 12, 13 Remote control operation switch 14 Control circuit

Claims (1)

[Claims] 1. An audio device having headphones connected to a device body and having a control function for controlling the operation of the device body, wherein the headphone output side line is kept at a constant potential different from circuit ground, and the line output Is used as a voltage supply line for remote control.