METHOD AND SYSTEM FOR DEREVERBERATION OF SIGNALS PROPAGATING IN REVERBERATIVE ENVIRONMENTS
First Claim
1. A method for processing of spatially distributed signals, comprising the steps of:
- (a) providing a sensor unit and a computational unit operatively coupled to said sensor unit for processing a plurality of signals registered at said sensor unit; and
(b) processing said plurality of signals by said computational unit through the steps of;
(c) computing, by said computational unit, spatial information corresponding to said plurality of signals in a space of interest, and(d) correlating, through processing said spatial information, at least one first signal with at least one second signals from said plurality thereof based on a predetermined similarity measure calculated by said computational unit for said plurality of signals for further combining said at least one first and second signals into an output signal with desired characteristics.
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Abstract
The dereverberation of signals in reverberating environments is carried out via acquiring the representation (image) of spatial distribution of the signals in space of interest and automatic identification of reflections of the source signal in the reverberative space. The technique relies on identification of prominent features at the image, as well as corresponding directions of propagation of signals manifested by the prominent features at the image, and computation of similarity metric between signals corresponding to the prominent features in the image. The time delays between the correlated signals (i.e., source signal and related reflections) are found and the signals are added coherently. Multiple beamformers operate on the source signal and corresponding reflections, enabling one to improve the signal-to-noise ratio in multi-path environments.
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Citations
20 Claims
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1. A method for processing of spatially distributed signals, comprising the steps of:
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(a) providing a sensor unit and a computational unit operatively coupled to said sensor unit for processing a plurality of signals registered at said sensor unit; and (b) processing said plurality of signals by said computational unit through the steps of; (c) computing, by said computational unit, spatial information corresponding to said plurality of signals in a space of interest, and (d) correlating, through processing said spatial information, at least one first signal with at least one second signals from said plurality thereof based on a predetermined similarity measure calculated by said computational unit for said plurality of signals for further combining said at least one first and second signals into an output signal with desired characteristics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A system for processing spatially distributed signals, comprising:
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a sensor unit positioned in a space of interest, a first Beamforming Processor coupled to said sensor unit to form a real-time image of signals arrived to said sensor unit spatially mapped to said space of interest, and a computational unit operationally coupled to said image to calculate an output signal with desired characteristics, wherein said computational unit includes; a Peaks Identification Unit for identification of at least a first peak and second peak at said image, wherein said at least first peak corresponds to a first signal arrived directly from at least one source of interest, and wherein said second peaks correspond to said signals including reflection signals of said at least first source of interest, a second Beamforming Processor for applying beamforming procedure to signals propagating in directions corresponding to said at least first peak and said second peaks, and a Similarity Measure Evaluation Unit coupled to said second Beamforming Processor to calculate a similarity score between said first and second signals, and defining at least one of said second signals as a reflection signal of said at least one source of interest if the similarity score reaches a predetermined threshold. - View Dependent Claims (18, 19, 20)
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Specification