TD-SCDMA/GSM double-mode cell phone audio frequency inputting switching circuit

A TD-SCDMA, dual-mode mobile phone technology, applied in the field of TD-SCDMA/GSM dual-mode mobile phone audio input switching circuit, can solve the problem of easy interference of voice signals, and achieve the effect of solving easy interference and reducing difficulty

Inactive Publication Date: 2007-11-07
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is to provide a TD-SCDMA / GSM dual-mode mobile phone audio input switching circuit, which solves the problem that the voice signal is easily interfered when the hardware circuit increases the audio input channel

Method used

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  • TD-SCDMA/GSM double-mode cell phone audio frequency inputting switching circuit
  • TD-SCDMA/GSM double-mode cell phone audio frequency inputting switching circuit

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Embodiment Construction

[0020] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Fig. 2 is a schematic diagram of the TD-SCDMA / GSM dual-mode mobile phone audio input switching circuit of the present invention.

[0022] Referring to Figure 2, by adding an analog switch to the circuit, a microphone is shared in the dual-mode mobile phone.

[0023] In this embodiment, the TD-SCDMA / GSM dual-mode mobile phone system uses the GSM module as the main control module, and the TD-SCDMA module is the controlled module, so the port used to control the analog switch to switch the microphone audio input is located in the main control module GSM module On the side, that is, the baseband main chip general-purpose I / O port GPIO1 of the GSM module is connected to the 4th pin and the 8th pin of the control terminal of the analog switch. The microphone receiving end MIC IN and MIC GND of the GSM module are respectively connected to the ...

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Abstract

An audio input switching-over circuit of TD-SCDMA double-mode mobile phone is prepared as connecting microphone with switch module being separately connected to microphone receiving ends of GSM module and TD-SCDMA module, setting one of GSM module and TD-SCDMA module to be master controlling module and another to be controlled module, connecting switching-over control end of switch module to signal end of master controlling module, using said switching-over controlling end to connect through module selectively and using signal end to indicate operation state of module.

Description

technical field [0001] The invention relates to a microphone audio switching control circuit, in particular to a TD-SCDMA / GSM dual-mode mobile phone audio input switching circuit. Background technique [0002] At present, in the TD-SCDMA / GSM dual-mode mobile phone, in order to ensure that both TD-SCDMA and GSM can carry out normal voice calls, the method usually considered is to use two microphones. In terms of hardware, this method is to connect two microphones to the microphone receivers of the GSM and TD-SCDMA modules respectively, that is, the microphone connected to the GSM module is used for GSM calls, and the microphone connected to the TD-SCDMA module is used for TD-SCDMA calls. microphone. [0003] Fig. 1 is a schematic diagram of a microphone audio input circuit of a TD-SCDMA / GSM dual-mode mobile phone when the existing circuit is designed. Referring to Figure 1, TD-SCDMA / GSM dual-mode mobile phones each use an independent microphone, and the microphone input cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/32H04W88/06H04M1/03
Inventor 丁克忠杨起
Owner ZTE CORP
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