Multi microphone sampling method and circuit with single ADC front end
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United States of America Patent
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Issued Date -
Nov 10, 2011
app pub date -
May 9, 2011
filing date -
May 9, 2010
priority date (Note) -
Abandoned
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Abstract
The invention relates generally to means and methods of improving the Signal to Noise Ratio (SNR) in communication devices. In particular, means and methods of alternating microphone inputs are disclosed. Multiple microphones are used to increase the SNR in a communication device that is capable of storing the input from only one microphone at a time. By alternating the inputs from the microphones and storing the inputs, multi-channel noise reduction techniques are employed in a system similar to a single channel system. Existing sigma-delta analog to digital converters may be used to time the switching between the microphones alternately. The microphones may be switched by relays, flip-flops, transistors, or other means. As the SNR is improved, traffic in a communications network may be increased by increasing the number of users in response to the lower bandwidth required.
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