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 problem of easy interference of voice signals, and achieve the effect of solving easy interference and reducing difficulty
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[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 input switching circuit of the present invention.
[0019] refer to figure 2 As shown, by adding an analog switch to the circuit, a microphone is shared in the dual-mode mobile phone.
[0020] In this embodiment, the TD-SCDMA / GSM dual-mode mobile phone system uses the TD-SCDMA / module as the main control module, and the GSM 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 TD - On the side of the SCDMA / module, that is, the general I / O port GPIO1 of the baseband main chip of the TD-SCDMA / module is connected to the 4th and 8th pins of the control end of the analog switch. The microphone receiving end MIC IN and MIC GND of the TD-SCDMA / module are respe...
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