SYSTEMS, METHODS, AND APPARATUS FOR PRODUCING A DIRECTIONAL SOUND FIELD
First Claim
Patent Images
1. A method of signal processing, said method comprising:
- determining a frequency profile of a source signal;
based on said frequency profile of the source signal, producing a masking signal according to a masking frequency profile, wherein the masking frequency profile is different than the frequency profile of the source signal; and
producing a sound field comprising (A) a source component that is based on the source signal and (B) a masking component that is based on the masking signal.
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Abstract
A system may be used to drive an array of loudspeakers to produce a sound field that includes a source component, whose energy is concentrated along a first direction relative to the array, and a masking component that is based on an estimated intensity of the source component in a second direction that is different from the first direction.
336 Citations
55 Claims
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1. A method of signal processing, said method comprising:
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determining a frequency profile of a source signal; based on said frequency profile of the source signal, producing a masking signal according to a masking frequency profile, wherein the masking frequency profile is different than the frequency profile of the source signal; and producing a sound field comprising (A) a source component that is based on the source signal and (B) a masking component that is based on the masking signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An apparatus for producing a sound field, said apparatus comprising:
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means for determining a frequency profile of a source signal; means for producing a masking signal, based on said frequency profile of the source signal, according to a masking frequency profile, wherein the masking frequency profile is different than the frequency profile of the source signal; and means for producing the sound field comprising (A) a source component that is based on the source signal and (B) a masking component that is based on the masking signal. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. An apparatus for producing a sound field, said apparatus comprising:
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a signal analyzer configured to determine a frequency profile of a source signal; a signal generator configured to produce a masking signal, based on said frequency profile of the source signal, according to a masking frequency profile, wherein the masking frequency profile is different than the frequency profile of the source signal; and an audio output stage configured to drive an array of loudspeakers to produce the sound field, wherein the sound field comprises (A) a source component that is based on the source signal and (B) a masking component that is based on the masking signal. - View Dependent Claims (36, 37, 38, 39, 40, 41)
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42. A non-transitory computer-readable data storage medium having tangible features that cause a machine reading the features to:
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determine a frequency profile of a source signal; produce, based on said frequency profile of the source signal, a masking signal according to a masking frequency profile, wherein the masking frequency profile is different than the frequency profile of the source signal; and produce a sound field comprising (A) a source component that is based on the source signal and (B) a masking component that is based on the masking signal.
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43. A method of signal processing, said method comprising:
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producing a multichannel source signal that is based on a source signal; producing a masking signal that is based on a noise signal; and driving a first directionally controllable transducer, in response to the multichannel source and masking signals, to produce a sound field comprising (A) a source component that is based on the multichannel source signal and (B) a masking component that is based on the masking signal, wherein said producing the masking signal is based on information from a recording of a second sound field produced by a second directionally controllable transducer. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50, 51, 52)
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53. An apparatus for signal processing, said apparatus comprising:
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means for producing a multichannel source signal that is based on a source signal; means for producing a masking signal that is based on a noise signal; and means for driving a first directionally controllable transducer, in response to the multichannel source and masking signals, to produce the sound field comprising (A) a source component that is based on the multichannel source signal and (B) a masking component that is based on the masking signal, wherein said producing the masking signal is based on information from a recording of a second sound field produced by a second directionally controllable transducer.
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54. An apparatus for signal processing, said apparatus comprising:
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a first spatially directive filter configured to produce a multichannel source signal that is based on a source signal; a second spatially directive filter configured to produce a masking signal that is based on a noise signal; and an audio output stage configured to drive a first directionally controllable transducer, in response to multichannel source and masking signals, to produce a sound field comprising (A) a source component that is based on the multichannel source signal and (B) a masking component that is based on the masking signal, wherein said producing the masking signal is based on information from a recording of a second sound field produced by a second directionally controllable transducer.
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55. A non-transitory computer-readable data storage medium having tangible features that cause a machine reading the features to:
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produce a multichannel source signal that is based on a source signal; produce a masking signal that is based on a noise signal; and drive a first directionally controllable transducer, in response to the multichannel source and masking signals, to produce a sound field comprising (A) a source component that is based on the multichannel source signal and (B) a masking component that is based on the masking signal.
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Specification