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Microphone circuit, system and headset

A microphone and circuit technology, applied in the field of circuits and systems, can solve problems such as interface resource shortage, and achieve the effect of reducing output pins

Inactive Publication Date: 2016-08-17
LETV HLDG BEIJING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the miniaturization of the terminal itself and peripherals and the trend of complex information transmission, the interface resources are becoming more and more tight. Therefore, how to save interface resources more effectively is also the focus of current research and development.

Method used

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  • Microphone circuit, system and headset
  • Microphone circuit, system and headset
  • Microphone circuit, system and headset

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Such as figure 2 As shown, it is one of the structural diagrams of the microphone circuit in Embodiment 1 of the present invention. The microphone circuit includes: a microphone (MIC) chip 1 and a signal conditioning circuit 2. The microphone chip 1 has a DC power input terminal VDD, a first The signal output terminal OUT1 is connected to the ground terminal GND.

[0020] The signal conditioning circuit is connected between the first signal output terminal and the ground, so that an AC signal path is formed between the first signal output terminal and the ground, and is used to output the first signal output terminal The first analog audio signal is superimposed on the DC power input signal at the DC power input terminal for output. Wherein, in the embodiment of the present invention, the microphone chip is preferably a MEMS (Micro Electro Mechanical System) type microphone chip.

[0021] This embodiment makes full use of the virtual short principle of the operationa...

Embodiment 2

[0029] The first embodiment mainly introduces the relevant circuit structure around the MIC chip, and this embodiment will further introduce the relevant circuit structure in the scenario of connecting the above-mentioned microphone circuit to the terminal. Such as Figure 5 As shown, it is a schematic structural diagram of the microphone circuit in Embodiment 2 of the present invention. On the basis of the microphone circuit in Embodiment 1, an interface module 4 is added. Wherein, the second signal output terminal OUT2 is located at the terminal side, and an interface module 4 is provided between the second signal output terminal and the DC power input terminal of the microphone chip.

[0030]Further, a microphone analog-to-digital (ADC) processing module is provided on the terminal side, the microphone analog-to-digital processing module includes a MICBIAS signal output terminal and a microphone signal input terminal, and the DC power supply is the MICBIAS signal output fro...

Embodiment 3

[0033] Such as Image 6 As shown in , it is a schematic structural diagram of a microphone circuit according to Embodiment 3 of the present invention. The difference between the present embodiment and the second embodiment is that the interface module 4 in the present embodiment is an interface module with a structure suitable for forward and reverse insertion.

[0034] Specifically, the interface module may have a first MIC / ground connection pin and a second MIC / ground connection pin having a positive and negative plug-in symmetrical relationship in position. The meaning of the MIC / ground connection pin mentioned here is that the microphone chip is connected to the terminal side only through two wires, one is the ground wire, and the other is used to transmit the DC power input superimposed with the first analog audio signal The transmission line of the signal (can be called the MIC signal transmission line, the output is the second analog audio signal), but due to the possi...

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Abstract

The embodiment of the invention provides a microphone circuit, a system and a headset. The microphone circuit comprises a microphone chip and a signal conditioning circuit. The microphone chip is provided with a direct-current power input end, a first signal output end and a grounding end connected with the ground. The signal conditioning circuit is connected between the first signal output end and the ground to make an alternating-current signal access formed between the first signal output end and the ground, and is used for superposing a first analog audio signal output by the first signal output end to a direct-current power input signal of the direct-current power input end for output. According to the embodiment, the signal conditioning circuit capable of conducting alternating-current signals is arranged between the first signal output end of an original output analog audio signal and the ground, so that the analog signal output by the first signal output end is superposed to the direct-current power input signal of the direct-current power input end for output; as a result, output pins of the microphone circuit are reduced, and then operation space is provided for saving interface resources between microphone equipment and terminals.

Description

technical field [0001] Embodiments of the present invention relate to a circuit and a system, in particular to a microphone circuit, a system and an earphone. Background technique [0002] An external MIC has always been an important peripheral for terminals such as computers, mobile phones, and tablet computers. With the popularity of mobile terminals, earphones with MIC are widely used in mobile terminals. The MIC earphone has both the functions of playing audio (video, music, call voice output) and sound (voice during call) input. [0003] Such as figure 1 As shown, it is a schematic structural diagram of a MIC circuit connected with a mobile phone in the prior art. The MIC circuit in the prior art requires three connecting wires to connect with the mobile phone terminal, which are the three connecting wires drawn from the ground terminal GND of the MIC chip, the MIC signal output terminal OUTPUT and the DC power input terminal VDD. With the development of technology, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/00H04R1/10
CPCH04R1/10H04R3/00
Inventor 赵庆关彬潘志刚
Owner LETV HLDG BEIJING CO LTD
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