Multi-earphone volume control circuit and control method

A volume control and earphone technology, applied in transducer circuits, electrical components, sensors, etc., can solve the problem that the volume of multiple earphones cannot be controlled separately, and achieve the effect of practical design and elimination of individual differences

Inactive Publication Date: 2014-10-29
QINGDAO GOERTEK
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the technical problem that the existing multi-earphone volume cannot be controlled separately, the present invention provides a multi-earphone volume control circuit and a control method, which can realize the volume control of multiple earphones separately

Method used

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  • Multi-earphone volume control circuit and control method
  • Multi-earphone volume control circuit and control method

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Embodiment 1

[0027] Embodiment 1. This embodiment provides a volume control circuit for multiple earphones, such as figure 1 As shown, it includes a codec for digital / analog conversion of audio signals, and also includes a single-chip microcomputer. The audio output terminals of the codec are respectively connected with the audio input terminals of a plurality of headphone amplifiers at the same time, and each headphone amplifier The audio output terminals of the audio frequency output terminals are respectively connected with an earphone SPK, and the single-chip microcomputer includes a plurality of volume adjustment command output terminals out1, out2 ... and a codec control command output terminal I2C_1, and the volume adjustment command output terminals out1, out2 ... are connected to the The volume adjustment command input terminals of the headphone amplifier are connected in one-to-one correspondence. Such as figure 1 As shown, the present embodiment takes two earphones as an exampl...

Embodiment 2

[0032] Embodiment 2. This embodiment provides an optimal circuit for a multi-earphone volume control circuit. In this embodiment, two earphones are respectively controlled as an example for illustration. Of course, it can also be extended on the basis of this embodiment. Connecting more than two earphones all belongs to the protection scope of the present invention.

[0033] Such as image 3 As shown, the codec U2 is realized by the codec of the model TI3253, and the single-chip MCU is realized by the single-chip computer of the model NUC123SD4AN0, such as Figure 4 Shown is the schematic diagram of one of the headphone amplifier U3, the headphone amplifier U3 is realized by a chip named TPA6130, and the other headphone amplifier can use the same chip. The audio output terminals AUDDIO_L and AUDDIO_R of the codec U2 are respectively connected to the audio input terminals of the two headphone amplifiers, such as Figure 4 As shown, taking the headphone amplifier U3 as an exam...

Embodiment 3

[0037] Embodiment 3, based on the above-mentioned multi-earphone volume control circuit, this control method includes part or all of the hardware circuit structure in Embodiment 1 or Embodiment 2, which will not be described here. The implementation of the control method is described. A method for controlling the volume of multiple earphones in this embodiment includes the following steps:

[0038] Audio signal transmission step, the codec receives the digital audio signal, converts it into an analog audio signal and sends it to the headphone amplifier;

[0039] In the control signal transmission step, the single-chip microcomputer receives or generates volume adjustment commands for controlling the audio volume of each earphone and sends them to corresponding headphone amplifiers, and the single-chip microcomputer simultaneously generates control commands for controlling the codec and sends them to the compilation Encoder;

[0040] In the audio signal processing and playing ...

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Abstract

The invention discloses a multi-earphone volume control circuit and a control method. The multi-earphone volume control circuit comprises a coder-decoder for performing digital-to-analogue conversion on audio signals, and a single chip; the audio output end of the coder-decoder is simultaneously connected with the audio input ends of a plurality of earphone amplifiers, respectively; the audio output end of each earphone amplifier is correspondingly connected with an earphone; the single chip comprises a plurality of volume regulating command output ends which are correspondingly connected with the volume regulating command input ends of the earphone amplifiers one to one; one volume regulating command output end of the single chip is connected with the control signal input end of the coder-decoder. The multi-earphone volume control circuit and the control method have the advantages that the plurality of earphone amplifier are correspondingly connected with the corresponding earphones, respectively, and used for processing the audio signals of the earphone connected with the earphone amplifiers, and therefore, the volume of each earphone is controlled separately, individual difference can be eliminated and the design is more practical.

Description

technical field [0001] The invention belongs to the technical field of earphone control circuits, and in particular relates to a multi-earphone volume control circuit and a control method. Background technique [0002] In some occasions or special applications, a system needs to connect two or more earphones. Generally, the volume of the two or more earphones is controlled by the system synchronously. When the system adjusts the volume to increase or decrease, all connected earphones Headphone volume will increase or decrease simultaneously. This kind of control circuit is inconvenient to use. Due to the difference in hearing sensitivity and personal preferences, there are individual differences, and it is impossible to guarantee that the same volume is suitable for all earphone wearers. Therefore, how to invent a multi-earphone volume control circuit to control each earphone separately Volume is the technical problem mainly solved by the present invention. Contents of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/00
Inventor 张明超
Owner QINGDAO GOERTEK
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