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US 8,965,546 B2Granted
Systems, methods, and apparatus for enhanced acoustic imaging
AssigneeQUALCOMM Incorporated
InventorsErik Visser, Pei Xiang
Life of this patent
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Abstract
Methods, systems, and apparatus for using a psychoacoustic-bass-enhanced signal to drive an array of loudspeakers are disclosed.
Claims49
A method of audio signal processing, said method comprising:
- spatially processing a first audio signal to generate a first plurality M of imaging signals;
- for each of the first plurality M of imaging signals, applying a corresponding one of a first plurality M of driving signals to a corresponding one of a first plurality M of loudspeakers of a first array, wherein the driving signal is based on the imaging signal;
- harmonically extending a second audio signal that includes energy in a first frequency range to produce an extended signal that includes harmonics, in a second frequency range that is higher than the first frequency range, of said energy of the second audio signal in the first frequency range;
- spatially processing an enhanced signal that is based on the extended signal to generate a second plurality N of imaging signals;
- and
- for each of the second plurality N of imaging signals, applying a corresponding one of a second plurality N of driving signals to a corresponding one of a second plurality N of loudspeakers of the first array, wherein the driving signal is based on the imaging signal, and wherein a distance between adjacent ones of the first plurality M of loudspeakers is less than a distance between adjacent ones of the second plurality N of loudspeakers.
3 more elements
An apparatus for audio signal processing, said apparatus comprising:
- means for spatially processing a first audio signal to generate a first plurality M of imaging signals;
- means for applying, for each of the first plurality M of imaging signals, a corresponding one of a first plurality M of driving signals to a corresponding one of a first plurality M of loudspeakers of a first array, wherein the driving signal is based on the imaging signal;
- means for harmonically extending a second audio signal that includes energy in a first frequency range to produce an extended signal that includes harmonics, in a second frequency range that is higher than the first frequency range, of said energy of the second audio signal in the first frequency range;
- means for spatially processing an enhanced signal that is based on the extended signal to generate a second plurality N of imaging signals;
- and
- means for applying, for each of the second plurality N of imaging signals, a corresponding one of a second plurality N of driving signals to a corresponding one of a second plurality N of loudspeakers of the first array, wherein the driving signal is based on the imaging signal, and wherein a distance between adjacent ones of the first plurality M of loudspeakers is less than a distance between adjacent ones of the second plurality N of loudspeakers.
3 more elements
An apparatus for audio signal processing, said apparatus comprising:
- a first spatial processing module configured to spatially process a first audio signal to generate a first plurality M of imaging signals;
- an audio output stage configured to apply, for each of the first plurality M of imaging signals, a corresponding one of a first plurality M of driving signals to a corresponding one of a first plurality M of loudspeakers of a first array, wherein the driving signal is based on the imaging signal;
- a harmonic extension module configured to harmonically extend a second audio signal that includes energy in a first frequency range to produce an extended signal that includes harmonics, in a second frequency range that is higher than the first frequency range, of said energy of the second audio signal in the first frequency range;
- and
- a second spatial processing module configured to spatially process an enhanced signal that is based on the extended signal to generate a second plurality N of imaging signals, wherein said audio output stage is configured to apply, for each of the second plurality N of imaging signals, a corresponding one of a second plurality N of driving signals to a corresponding one of a second plurality N of loudspeakers of the first array, wherein the driving signal is based on the imaging signal, and wherein a distance between adjacent ones of the first plurality M of loudspeakers is less than a distance between adjacent ones of the second plurality N of loudspeakers.
2 more elements
A non-transitory computer-readable storage medium having tangible features that when read by a machine cause the machine to:
- spatially process a first audio signal to generate a first plurality M of imaging signals;
- apply, for each of the first plurality M of imaging signals, a corresponding one of a first plurality M of driving signals to a corresponding one of a first plurality M of loudspeakers of a first array, wherein the driving signal is based on the imaging signal;
- harmonically extend a second audio signal that includes energy in a first frequency range to produce an extended signal that includes harmonics, in a second frequency range that is higher than the first frequency range, of said energy of the second audio signal in the first frequency range;
- spatially process an enhanced signal that is based on the extended signal to generate a second plurality N of imaging signals;
- and
- apply, for each of the second plurality N of imaging signals, a corresponding one of a second plurality N of driving signals to a corresponding one of a second plurality N of loudspeakers of the first array, wherein the driving signal is based on the imaging signal, and wherein a distance between adjacent ones of the first plurality M of loudspeakers is less than a distance between adjacent ones of the second plurality N of loudspeakers.
3 more elements
Dependencies are inferred from the claim text.