Loudspeaker array with signal dependent radiation pattern
First Claim
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1. A sound reproduction system that accepts as input a stereo pair of electrical signals and outputs in response acoustical signals, the system comprising:
- input means for accepting a stereo pair of electrical input signals,first and second amplification means for amplifying said pair of signals,first and second loudspeaker means for outputting a pair of acoustical signals, andfirst and second wave type directional devices for modifying the radiation pattern of said output acoustical signals,wherein the first input signal of the stereo pair of signals is amplified by said first amplification means, and wherein the output of said first amplification means is applied to said first loudspeaker means which gives rise to a first acoustic signal which is modified by said first wave type directional device so that it is radiated with a directional radiation pattern over at least the majority of the frequency range where interaural time difference (ITD) cues dominate localization in the human auditory system, said range covering frequencies from approximately 150 Hz to 1500 Hz, in which the directional radiation pattern has a main radiation lobe which is pointed in a first direction; and
wherein the second input signal of the stereo pair of signals is amplified by said second amplification means, and wherein the output of said second amplification means is applied to said second loudspeaker means which gives rise to a second acoustic signal which is modified by said second wave type directional device so that it is radiated with a directional radiation pattern over at least the majority of said frequency range, in which the directional radiation pattern has a main radiation lobe which is pointed in a second direction which is different from said first direction.
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Abstract
This invention features a sound reproduction system in which both signals of a stereo pair of signals are radiated with a directional radiation pattern having a first order gradient characteristic over the frequency range where interaural time difference cues dominate localization in the human auditory system. The directional radiation patterns have main radiation lobes pointing in different directions.
258 Citations
49 Claims
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1. A sound reproduction system that accepts as input a stereo pair of electrical signals and outputs in response acoustical signals, the system comprising:
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input means for accepting a stereo pair of electrical input signals, first and second amplification means for amplifying said pair of signals, first and second loudspeaker means for outputting a pair of acoustical signals, and first and second wave type directional devices for modifying the radiation pattern of said output acoustical signals, wherein the first input signal of the stereo pair of signals is amplified by said first amplification means, and wherein the output of said first amplification means is applied to said first loudspeaker means which gives rise to a first acoustic signal which is modified by said first wave type directional device so that it is radiated with a directional radiation pattern over at least the majority of the frequency range where interaural time difference (ITD) cues dominate localization in the human auditory system, said range covering frequencies from approximately 150 Hz to 1500 Hz, in which the directional radiation pattern has a main radiation lobe which is pointed in a first direction; and wherein the second input signal of the stereo pair of signals is amplified by said second amplification means, and wherein the output of said second amplification means is applied to said second loudspeaker means which gives rise to a second acoustic signal which is modified by said second wave type directional device so that it is radiated with a directional radiation pattern over at least the majority of said frequency range, in which the directional radiation pattern has a main radiation lobe which is pointed in a second direction which is different from said first direction. - View Dependent Claims (23, 32)
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2. A sound reproduction system that accepts as input a stereo pair of electrical signals and outputs in response acoustical signals, the system comprising:
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input means for accepting a stereo pair of electrical input signals, signal processing means for altering characteristics of accepted input signals, and acoustic source means for outputting first and second acoustical signals, wherein the first input signal of the stereo pair of signals is processed by said signal processing means, wherein the resulting output of said signal processing means is applied to said acoustic source means which gives rise to a first acoustic signal which is radiated with a directional radiation pattern having a first order gradient characteristic over at least the majority of the frequency range where interaural time difference (ITD) cues dominate localization in the human auditory system, said range covering frequencies approximately from 150 Hz to 1500 Hz, in which the directional radiation pattern has a main radiation lobe which is pointed in a first direction; and wherein the second input signal of the stereo pair of signals is processed by said signal processing means, wherein the resulting output of said signal processing means is applied to said acoustic source means which gives rise to a second acoustic signal which is radiated with a directional radiation pattern having a first order gradient characteristic over at least the majority of said frequency range, in which the directional radiation pattern has a main radiation lobe which is pointed in a second direction, which is different from said first direction. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29, 30, 31, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. A sound reproduction system that accepts as input a stereo pair of electrical signals and outputs in response acoustical signals, the system comprising:
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input means for accepting a stereo pair of electrical input signals, signal processing means for altering characteristics of accepted input signals, and first and second acoustic source means for outputting first and second acoustical signals, wherein said first acoustical source has a monopole radiation pattern and said second acoustical source has a dipole radiation pattern over at least the majority of the frequency range where interaural time difference cues (ITD) dominate localization in the human auditory system, and wherein the origins in space of the monopole acoustic source and dipole acoustic source radiation patterns appear substantially coincident, over said frequency range, and wherein said signal processing means creates a first signal that is the sum of the pair of electrical input signals and creates a second signal that is the difference between the pair of electrical input signals, wherein said signal processing further includes means for altering the sum and difference signals so that the shape of the magnitude frequency response of the dipole acoustic source output for the first electrical input signal substantially matches the shape of the magnitude frequency response of the monopole acoustic source output for the first input signal, over said frequency range, and wherein the shape of the magnitude frequency response of the dipole acoustic source output for the second electrical input signal substantially matches the shape of the magnitude frequency response of the monopole acoustic source output for the second input signal, over said frequency range, when the altered sum signal is input to the monopole acoustic source and the altered difference signal is input to the dipole acoustical source, and wherein said means for altering said sum and difference signals which are applied to the monopole and dipole acoustic sources respectively, also alters the phase relationship between the dipole and monopole acoustic source outputs, so that the phase frequency responses of the monopole and dipole acoustic source outputs, for the first and second input signals, are either approximately in phase or approximately 180 degrees out of phase, over said frequency range.
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48. A sound reproduction system that accepts as input a stereo pair of electrical signals and outputs in response acoustical signals, the system comprising:
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input means for accepting a stereo pair of electrical input signals, signal processing means for altering characteristics of accepted input signals, and first and second acoustic source means for outputting first and second acoustical signals, wherein said first acoustical source has a monopole radiation pattern and said second acoustical source has a monopole radiation pattern, and wherein said signal processing means creates a first signal that is the sum of the pair of electrical input signals and creates a second signal that is the difference between the pair of electrical input signals, wherein said signal processing further includes means for altering the sum and difference signals, wherein the altered sum signal is simultaneously input to both monopole acoustic sources with identical polarity to form a combined monopole source, and the altered difference signal is simultaneously applied to both monopole acoustic sources with inverted relative polarity to form a combined dipole acoustic source, wherein the origins in space of the combined monopole acoustic source and combined dipole acoustic source radiation patterns appear substantially coincident, over at least the majority of the frequency range where interaural time difference cues (ITD) dominate localization in the human auditory system, and wherein said signal processing means alters said sum and difference signals so that the shape of the magnitude frequency response of the combined dipole acoustic source output for the first electrical input signal substantially matches the shape of the magnitude frequency response of the combined monopole acoustic source output for the first electrical input signal, over said frequency range, and wherein the shape of the magnitude frequency response of the combined dipole acoustic source output for the second electrical input signal substantially matches the shape of the magnitude frequency response of the combined monopole acoustic source output for the second electrical input signal, over said frequency range, and wherein said means for altering said sum and difference signals also alters the phase relationship between the combined dipole acoustic source output and the combined monopole acoustic source output, so that the phase frequency responses of the combined monopole and combined dipole acoustic source outputs, for the first and second input signals, are either approximately in phase or approximately 180 degrees out of phase, over said frequency range.
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49. A sound reproduction system that accepts as input a stereo pair of electrical signals and outputs in response acoustical signals, the system comprising:
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input means for accepting a stereo pair of electrical input signals, signal processing means for altering characteristics of accepted input signals, and first and second acoustic source means for outputting first and second acoustical signals, wherein said first and second acoustical sources have monopole radiation patterns, and wherein said signal processing means creates a signal that is the difference between the pair of electrical input signals, wherein said signal processing further includes means for altering the electrical input signals and said difference signal, wherein the altered first electrical input signal is input to the first monopole source and the altered second input electrical signal is input to the second monopole acoustic source, and the altered difference signal is simultaneously applied to both monopole acoustic sources with inverted relative polarity to form a combined dipole acoustic source, wherein the origins in space of the monopole acoustic sources and the combined dipole acoustic source radiation patterns appear substantially coincident, over at least the majority of the frequency range where interaural time difference cues (ITD) dominate localization in the human auditory system, and wherein said signal processing means alters said electrical input signals and said difference signal so that the shape of the magnitude frequency response of the combined dipole acoustic source output for the first electrical input signal substantially matches the shape of the magnitude frequency response of the first monopole acoustic source output for the altered first electrical input signal, over said frequency range, and wherein the shape of the magnitude frequency response of the combined dipole acoustic source output for the second electrical input signal substantially matches the shape of the magnitude frequency response of the second monopole acoustic source output for the second electrical input signal, over said frequency range, and wherein said means for altering said electrical input signals and said difference signal also alters the phase relationship between the combined dipole acoustic source output and each monopole acoustic source output, so that the phase frequency responses of each monopole and combined dipole acoustic source outputs, for the first and second input signals, are either approximately in phase or approximately 180 degrees out of phase, over said frequency range.
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Specification