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
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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 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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