Stereo separation and directional suppression with omni-directional microphones
First Claim
1. A method for providing stereo separation and directional suppression, the method comprising:
- configuring a processor to receive at least a first audio signal and a second audio signal, the first audio signal representing sound captured by a first microphone associated with a first location and the second audio signal representing sound captured by a second microphone associated with a second location, the first microphone and the second microphone comprising omni-directional microphones of a mobile device, the distance between the first microphone and the second microphone being limited by the size of the mobile device;
configuring the processor to generate a first channel signal of a stereo audio signal by forming, based on the first audio signal and the second audio signal, a first beam at the first location; and
configuring the processor to generate a second channel signal of the stereo audio signal by forming, based on the first audio signal and the second audio signal, a second beam at the second location,wherein forming one or both of the first beam and the second beam includes;
attenuating the first audio signal by a first attenuation factor;
subtracting the attenuated first audio signal from the second audio signal to produce a first summed signal;
attenuating the first summed signal by a second attenuation factor; and
subtracting the attenuated first summed signal from the first audio signal to produce a second summed signal.
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Accused Products
Abstract
Systems and methods for stereo separation and directional suppression are provided. An example method includes receiving a first audio signal, representing sound captured by a first microphone associated with a first location, and a second audio signal, representing sound captured by a second microphone associated with a second location. The microphones comprise omni-directional microphones. The distance between the first and second microphones is limited by the size of a mobile device. A first channel signal of a stereo signal is generated by forming, based on the first and second audio signals, a first beam at the first location. A second channel signal of the stereo signal is generated by forming, based on the first and second audio signals, a second beam at the second location. First and second directions, associated respectively with the first and second beams, are fixed relative to a line between the first and second locations.
227 Citations
24 Claims
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1. A method for providing stereo separation and directional suppression, the method comprising:
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configuring a processor to receive at least a first audio signal and a second audio signal, the first audio signal representing sound captured by a first microphone associated with a first location and the second audio signal representing sound captured by a second microphone associated with a second location, the first microphone and the second microphone comprising omni-directional microphones of a mobile device, the distance between the first microphone and the second microphone being limited by the size of the mobile device; configuring the processor to generate a first channel signal of a stereo audio signal by forming, based on the first audio signal and the second audio signal, a first beam at the first location; and configuring the processor to generate a second channel signal of the stereo audio signal by forming, based on the first audio signal and the second audio signal, a second beam at the second location, wherein forming one or both of the first beam and the second beam includes; attenuating the first audio signal by a first attenuation factor; subtracting the attenuated first audio signal from the second audio signal to produce a first summed signal; attenuating the first summed signal by a second attenuation factor; and subtracting the attenuated first summed signal from the first audio signal to produce a second summed signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for stereo separation and directional suppression, the system comprising:
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at least one processor; and a memory communicatively coupled with the at least one processor, the memory storing instructions, which when executed by the at least one processor, perform a method comprising; receiving at least a first audio signal and a second audio signal, the first audio signal representing sound captured by a first microphone associated with a first location and the second audio signal representing sound captured by a second microphone associated with a second location, the first microphone and the second microphone comprising omnidirectional microphones of a mobile device, the distance between the first microphone and the second microphone being limited by the size of the mobile device; generating a first channel signal of a stereo audio signal by forming, based on the first audio signal and the second audio signal, a first beam at the first location; and generating a second channel signal of the stereo audio signal by forming, based on the first audio signal and the second audio signal, a second beam at the second location, wherein forming one or both of the first beam and the second beam includes; attenuating the first audio signal by a first attenuation factor; subtracting the attenuated first audio signal from the second audio signal to produce a first summed signal; attenuating the first summed signal by a second attenuation factor; and subtracting the attenuated first summed signal from the first audio signal to produce a second summed signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A non-transitory computer-readable storage medium having embodied thereon instructions, which when executed by at least one processor, perform steps of a method for stereo separation and directional suppression, the method comprising:
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receiving at least a first audio signal and a-second audio signal, the first audio signal representing sound captured by a first microphone associated with a first location and the second audio signal representing sound captured by a second microphone associated with a second location, the first microphone and the second microphone comprising omnidirectional microphones of a mobile device, the distance between the first microphone and the second microphone being limited by the size of the mobile device; generating a first channel signal of a stereo audio signal by forming, based on the first audio signal and the second audio signal, a first beam at the first location; and generating a second channel signal of the stereo audio signal by forming, based on the first audio signal and the second audio signal, a second beam at the second location, wherein forming one or both of the first beam and the second beam includes; attenuating the first audio signal by a first attenuation factor; subtracting the attenuated first audio signal from the second audio signal to produce a first summed signal; attenuating the first summed signal by a second attenuation factor; and subtracting the attenuated first summed signal from the first audio signal to produce a second summed signal.
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Specification