Beamformer direction of arrival and orientation analysis system
First Claim
1. A beamforming apparatus comprising:
- a microphone array including a plurality of microphones having time domain signal outputs each representing audio information;
a multi-channel domain conversion stage having inputs connected to said time domain signal outputs of said microphone array converting said time domain signal outputs of said microphone array to outputs as a plurality of frequency domain signals representing said audio information;
a multi-channel bandpass filter, each channel having a frequency domain signal input connected to an output of said multi-channel domain conversion stage and having a limited band output corresponding to said frequency domain signals;
a beamformer filter having a plurality of inputs connected to outputs of said multi-channel bandpass filter stage and having a plurality of outputs, each representing audio in an audio direction of arrival zone;
an inverse domain conversion stage having inputs connected to said plurality of outputs of said beamformer filter, converting each of said plurality of outputs of said beamformer filter from frequency domain signals to time domain signals and having a plurality of time domain outputs;
a histogram analysis stage having multi-channel inputs connected to said multi-channel bandpass filter and having an output identifying one or more channels ranked by audio dominance; and
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a multi-channel output register having a first set of inputs connected to said inverse domain conversion stage and a second set of inputs connected to said histogram analysis stage wherein said first set of inputs corresponding to a direction of arrival and a second set of inputs representing an identification of said audio channels ranked by audio dominance are combined and output by said multi-channel output register.
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Abstract
A beamforming apparatus may have a domain conversion stage converting a plurality of time domain signals representing audio information to a plurality of frequency domain signals representing said audio information, a bandpass filter stage having a plurality of inputs connected to the frequency domain signals and having a plurality of outputs. A beamformer filter stage may have a plurality of inputs corresponding to the of outputs of the bandpass filter stage and a plurality of outputs. An inverse domain conversion stage, converting a plurality of inputs corresponding to outputs of the beamformer filter stage from frequency domain signals to time domain signals and having a plurality of outputs connected to an output stage.
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Citations
13 Claims
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1. A beamforming apparatus comprising:
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a microphone array including a plurality of microphones having time domain signal outputs each representing audio information; a multi-channel domain conversion stage having inputs connected to said time domain signal outputs of said microphone array converting said time domain signal outputs of said microphone array to outputs as a plurality of frequency domain signals representing said audio information; a multi-channel bandpass filter, each channel having a frequency domain signal input connected to an output of said multi-channel domain conversion stage and having a limited band output corresponding to said frequency domain signals; a beamformer filter having a plurality of inputs connected to outputs of said multi-channel bandpass filter stage and having a plurality of outputs, each representing audio in an audio direction of arrival zone; an inverse domain conversion stage having inputs connected to said plurality of outputs of said beamformer filter, converting each of said plurality of outputs of said beamformer filter from frequency domain signals to time domain signals and having a plurality of time domain outputs; a histogram analysis stage having multi-channel inputs connected to said multi-channel bandpass filter and having an output identifying one or more channels ranked by audio dominance; and
;a multi-channel output register having a first set of inputs connected to said inverse domain conversion stage and a second set of inputs connected to said histogram analysis stage wherein said first set of inputs corresponding to a direction of arrival and a second set of inputs representing an identification of said audio channels ranked by audio dominance are combined and output by said multi-channel output register. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification