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Audio input switching circuit for TD-SCDMA/GSM dual-mode mobile phone

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 problems of voice signals being easily interfered, and achieve the effect of solving the problem of being easily interfered and reducing the difficulty

Inactive Publication Date: 2008-06-04
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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  • Audio input switching circuit for TD-SCDMA/GSM dual-mode mobile phone
  • Audio input switching circuit for TD-SCDMA/GSM dual-mode mobile phone

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Embodiment Construction

[0018] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0019] figure 2 It is a schematic diagram of the TD-SCDMA / GSM dual-mode mobile phone audio input switching circuit of the present invention.

[0020] refer to figure 2 As shown, by adding an analog switch to the circuit, a microphone is shared in the dual-mode mobile phone.

[0021] 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 con...

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Abstract

The invention discloses an audio input switching circuit for a TD-SCDMA / GSM double-mode handset, which comprises a GSM module, a TD-SCDMA module, a switch module and a microphone. The microphone is connected with the switch module, the switch module is respectively connected with the microphone receiving terminals of the GSM module and the TD-SCDMA module; the GSM module is a main control module and the TD-SCDMA module is a controlled module; the switching control terminal of the switch module is connected with the signal terminal of the main control module, the switching control terminal is used for controlling the switch module to choose to switch the GSM module or the TD-SCDMA module on; when the main control module carries out the voice communication, the signal terminal sends out a low-level signal; when the controlled module carries out the voice communication, the signal terminal sends out a high-level signal. The technical proposal of the invention solves the problem that the voice signal is easy to be interfered when an audio input channel is additionally arranged for the hardware circuit.

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] figure 1 Schematic diagram of TD-SCDMA / GSM dual-mode mobile phone microphone audio input circuit when designing for existing circuits. refer to figure 1 As shown, the TD-SCDMA / GSM dual-mode mobile phone each uses an independent microphone, and the microphone input cha...

Claims

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Application Information

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IPC IPC(8): H04Q7/32H04B1/40H04M1/02H04M1/72448H04W88/06
Inventor 丁克忠杨起
Owner ZTE CORP
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