Sound field spatial stabilizer
First Claim
1. A computer implemented method for maintaining spatial stability of a sound field comprising:
- calculating one or more balance gains for two or more microphone signals, where each of the two or more microphone signals is from a corresponding one of two or more microphones, the one or more balance gains represent a detected balance of a spatial image of the sound field received by the microphones;
calculating one or more signal values for each of the two or more microphone signals;
limiting differences between corresponding one or more signal values for each of the two or more microphone signals; and
maintaining the detected balance of the sound field in two or more output signals generated by gain adjusting the two or more microphone signals taking into account the one or more balance gains and the limited one or more signal values for each of the two or more microphone signals.
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Accused Products
Abstract
In a system and method for maintaining the spatial stability of a sound field a balance gain may be calculated for two or more microphone signals. The balance gain may be associated with a spatial image in the sound field. Signal values may be calculated for each of the microphone. The signal values may be signal estimates or signal gains calculated to improve a characteristic of the microphone signals. The differences between the signal values associated with each microphone signal may be limited although some difference between signal values may be allowable. One or more microphone signals are adjusted responsive to the two or more balance gains and the signal gains to maintain the spatial stability of the sound field. The adjustments of one or more microphone signals may include mixing of two or more microphone. The signal gains are applied to the two or more microphone signals.
30 Citations
22 Claims
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1. A computer implemented method for maintaining spatial stability of a sound field comprising:
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calculating one or more balance gains for two or more microphone signals, where each of the two or more microphone signals is from a corresponding one of two or more microphones, the one or more balance gains represent a detected balance of a spatial image of the sound field received by the microphones; calculating one or more signal values for each of the two or more microphone signals; limiting differences between corresponding one or more signal values for each of the two or more microphone signals; and maintaining the detected balance of the sound field in two or more output signals generated by gain adjusting the two or more microphone signals taking into account the one or more balance gains and the limited one or more signal values for each of the two or more microphone signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for maintaining spatial stability of a sound field comprising:
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a balance calculator configured to calculate one or more balance gains for each of two or more microphone signals, the one or more balance gains representing a detected balance of a spatial image of the sound field received by the microphones; two or more signal value generators, each one associated with a corresponding one of the two or more microphone signals, configured to calculate one or more signal values; one or more difference limiters configured to limit differences between corresponding one or more signal values for each of the two or more microphone signals; a balance adjuster configured to calculate adjusted one or more balance gains responsive to the calculated one or more balance gains and the limited one or more signal values for each of the two or more microphone signals, the adjusted one or more balance gains calculated to maintain the detected balance of the sound field in two or more output signals; and two or more gain filters, each one associated with one of the two or more microphone signals, configured to generate the two or more output signals as gain adjustments of the two or more microphone signals, the gain adjustments responsive to the adjusted one or more balance gains. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A computer implemented method for maintaining spatial stability of a sound field comprising:
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calculating one or more balance gains for two or more microphone signals, where each of the two or more microphone signals is from a corresponding one of two or more microphones, the one or more balance gains represent a balance of a spatial image of the sound field received by the microphones; calculating one or more signal values for each of the two or more microphone signals, where calculating the one or more balance gains for the two or more microphone signals further comprises selectively updating the one or more balance gains responsive to one or more of the signal values exceeding a first threshold and a signal-to-noise ratio of any of the two or more microphone signals exceeding a second threshold; limiting differences between corresponding one or more signal values for each of the two or more microphone signals; and maintaining the spatial stability of the sound field by gain adjusting the two or more microphone signals responsive to the one or more balance gains and the limited one or more signal values for each of the two or more microphone signals.
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Specification