Apparatuses and methods for acoustic channel auto-balancing during multi-channel signal extraction
AssigneeKopin Corporation
InventorDashen Fan
Life of this patent
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Abstract
Systems and methods are described to automatically balance acoustic channel sensitivity. A long-term power level of a main acoustic signal is calculated to obtain an averaged main acoustic signal. Segments of the main acoustic signal are excluded from the averaged main acoustic signal using a desired voice activity detection signal. A long-term power level of a reference acoustic signal is calculated to obtain an averaged reference acoustic signal. Segments of the reference acoustic signal are excluded from the averaged reference acoustic signal using a desired voice activity detection signal. An amplitude correction signal is created using the averaged main acoustic signal and the averaged reference acoustic signal.
Claims21
A method to automatically balance acoustic channel sensitivity, comprising:
- calculating a long-term power level of a main acoustic signal to obtain an averaged main acoustic signal, wherein segments of the main acoustic signal are excluded from the averaged main acoustic signal using a desired voice activity detection signal;
- calculating a long-term power level of a reference acoustic signal to obtain an averaged reference acoustic signal, wherein segments of the reference acoustic signal are excluded from the averaged reference acoustic signal using the desired voice activity detection signal;
- and
- creating an amplitude correction signal using the averaged main acoustic signal and the averaged reference acoustic signal.
An apparatus to automatically balance multiple audio channels, comprising:
- a data processing system, the data processing system is configured to process acoustic signals;
- and
- a computer readable medium containing executable computer program instructions, which when executed by the data processing system, cause the data processing system to perform a method comprising:
- calculating a long-term power level of a main acoustic signal to obtain an averaged main acoustic signal, wherein segments of the main acoustic signal are excluded from the averaged main acoustic signal using a desired voice activity detection signal;
- calculating a long-term power level of a reference acoustic signal to obtain an averaged reference acoustic signal, wherein segments of the reference acoustic signal are excluded from the averaged reference acoustic signal using the desired voice activity detection signal;
- and
- creating an amplitude correction signal using the averaged main acoustic signal and the averaged reference acoustic signal.
An apparatus to automatically balance acoustic channel sensitivity, comprising:
- a device, the device further comprising:
- a first signal path, the first signal path is configured to receive and average acoustic signals from a first microphone channel to produce a long-term running average power level of the first microphone channel, exclusive of segments containing desired audio;
- a second signal path, the second signal path is configured to receive and average acoustic signals from a second microphone channel to produce a long-term running average power level of the second microphone channel, exclusive of segments containing desired audio;
- a divider, the first signal path is coupled to a first input into the divider and the second signal path is coupled to a second input into the divider, the divider is configured to divide a signal on the first input by a signal on the second input to output an amplitude correction signal;
- and
- a multiplier, the multiplier is coupled to the second signal path and to the output of the divider, the multiplier is configured to multiply the amplitude correction signal by the second microphone channel to produce a corrected second microphone signal.
Dependencies are inferred from the claim text.