JP2000287289A - Sound output unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sound output unit whose sound volume can be adjusted with a switch built in a headphone. SOLUTION: A sound volume adjustment signal (Volume UP/Volume Down) from a switch 21 built in a headphone 2 with a cable connected to tone terminal of a main body 1 is superimposed on a sound signal line, a detection section 13 identifies an operating level of the switch 21 and a sound volume adjustment section 11 controls the sound volume. An amplifier section 12 that is controlled by an amplification/reference voltage control signal from the detection section 13 outputs the sound signal adjusted by the sound volume adjustment section 11. The sound output line receives a prescribed reference voltage to generate the sound volume adjustment signal by an amplifier section 12 so as to adopt a configuration such that the reference voltage is changed according to the sound signal level.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio output device to which headphones can be connected, and more particularly, to a switch for adjusting the volume to the left and right headphones, and detecting that this switch has been pressed to the main body. Signal processing technology for providing a level detection circuit for controlling audio output.

[0002]

2. Description of the Related Art In a conventional audio output device, as shown in FIG. 2, a switch or a knob 113 for adjusting a volume is provided on a main body 1 or a cable.

In this case, a switch or a knob 113 is used.
The output sound volume is adjusted by the sound volume control unit 11 in accordance with the sound volume control signal supplied from the control unit 10 and output from the amplification unit 12.

[0004]

As described above, in the conventional audio output device, a switch or a knob for adjusting the volume is provided on the main body or on the cable.
When adjusting the volume, there is a problem that it is necessary to take out a main body or a cable provided with a switch or a knob for adjusting the volume.

Accordingly, it is an object of the present invention to provide an audio output device capable of adjusting the volume without removing the main body or the cable.

[0006]

In order to solve the above-mentioned problems, an audio output device according to the present invention is provided with a main body, headphones with a cable connected to one end of the main body, and a built-in headphone. A switch for adjusting the volume,
A detection unit for detecting a volume adjustment signal of Volume Up / Volume Down from the headphones, a volume adjustment unit for adjusting the volume by a volume control signal from the detection unit, and an audio signal adjusted by the volume adjustment unit. An amplification unit that performs amplification control by a control signal from the detection unit; and a storage unit that stores Up / Down information of the volume detected by the detection unit. The volume adjustment signal is provided to two audio signal lines. Are superimposed.

[0007]

Next, an audio output device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram (A) and a reference voltage fluctuation curve (B) of an audio output device according to an embodiment of the present invention.

As shown in FIG. 1A, a sound output device according to an embodiment of the present invention includes a main body 1 and the main body 1.
Headphone 2 with cable connected to one end of the
A switch 21 built in the headphones 2 for volume adjustment, a detection unit 13 for detecting a volume adjustment signal (Volume Up / Volume Down) from the headphones 2, A volume adjusting unit 11 for adjusting the volume according to a volume control signal;
Amplifying section 12 for controlling the amplification of the audio signal adjusted by the control signal from the detecting section 13;
And a storage unit 14 for storing the Up / Down information of the volume detected in the step (1), wherein a volume adjustment signal is mainly superimposed on two audio signal lines.

Next, the operation of the audio output device according to one embodiment of the present invention will be described with reference to the drawings.

The operation of the audio output device according to the embodiment of the present invention is performed by operating a switch 21 incorporated in the headphone 2 at the time of adjusting the volume, so that a volume adjustment signal (Volume Up / Volume Down signal) is output and sent to the detection unit 13 inside the
3 receives a volume control signal from the switch 21 inside the headphones 2, identifies whether the switch 21 has been operated, and sends a volume control signal to the volume control unit 11.

The detector 13 also detects the level of the audio signal from the volume controller 11 and outputs a control signal to the amplifier 12 for setting the signal amplification and the reference voltage level. As shown in FIG. 1B, the level of the reference voltage is set low when no signal signal is input, and is set high each time the signal level is increased.
Adjusts the volume of the signal according to the volume control signal from the detection unit 13, and outputs an audio signal to the amplification unit 12 and the detection unit 13.

Therefore, the amplifying unit 12 sets the amplification degree of the signal and the reference voltage level according to the control signal from the detecting unit 13, performs an amplifying process on the audio signal from the volume adjusting unit 11, and Is received from the detection unit 13 and stored, and is read out when the switch 21 is operated or when the power is turned on.

[0014]

As described above, according to the audio output device of the present invention, it is possible to provide a device capable of adjusting the volume by a switch built in headphones without taking out the main body or the cable. Can be.

[Brief description of the drawings]

FIG. 1A is a block diagram of an audio output device according to an embodiment of the present invention, and FIG.

FIG. 2 is a block diagram of a conventional audio output device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Audio output device (main body) 2 Headphones 21 Switch 11 Volume adjustment unit 12 Amplification unit 13 Detection unit 14 Storage unit

Claims (1)

[Claims] 1. A main body, headphones with a cable connected to one end of the main body, a switch for adjusting a volume built in the headphones, and a volume adjustment signal of Volume Up / Volume Down from the headphones. Detecting section, a volume adjusting section for adjusting the volume by a volume control signal from the detecting section, and an amplification section for performing amplification control on the audio signal adjusted by the volume adjusting section by a control signal from the detecting section. Unit and Up / D of the volume detected by the detection unit
An audio output device comprising a storage unit for storing own information, wherein the volume adjustment signal is superimposed on two audio signal lines.