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

A TD-SCDMA, dual-mode mobile phone technology, applied in the field of microphone audio switching control 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: 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 control circuit, which solves the problem that the voice signal is easily disturbed when the hardware circuit increases the audio input channel

Method used

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  • Audio control circuit for TD-SCDMA/GSM dual-mode mobile phone
  • Audio control circuit for TD-SCDMA/GSM dual-mode mobile phone

Examples

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Embodiment Construction

[0017] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0018] figure 2 It is a schematic diagram of the TD-SCDMA / GSM dual-mode mobile phone audio control circuit of the present invention.

[0019] refer to figure 2 As shown, by adding a dual-channel analog switch to the circuit, a microphone is shared in a dual-mode mobile phone.

[0020] 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 dual-channel analog switch to switch the microphone audio input is located in the main control module On the side of the GSM module, that is, the general-purpose I / O port GPIO1 of the baseband main chip of the GSM module is connected to the 4th and 8th pins of the control terminal of the dual-channel analog switch. The microphone receiving end MIC IN and MIC GND of ...

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Abstract

The invention discloses an audio control circuit for a TD-SCDMA / GSM double-mode handset, which comprises a GSM module, a TD-SCDMA module, a two-channel analog switch and a microphone. The microphone is connected with the two-channel analog switch, the two-channel analog switch is respectively connected with the microphone receiving terminals of the GSM module and the TD-SCDMA module; of the GSM module and the TD-SCDMA module, one is a main control module and the other is a controlled module; the switching control terminal of the two-channel analog switch is connected with the signal terminal of the main control module, the switching control terminal is used for controlling the two-channel analog switch 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 a low-level signal; when the controlled module carries out the voice communication, the signal terminal sends a high-level signal.

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 control 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 channels of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/32H04B1/40H04M1/02H04W88/06
Inventor 丁克忠杨起
Owner ZTE CORP
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