Audio Signal Processing
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Accused Products
Abstract
An audio system for processing two channels of audio input to provide more than two output channels. The input may be conventional stereo material or compressed audio signal data. The audio processing includes separating the input signals into frequency bands and processing the frequency bands according to processes which may differ from band to band. The audio processing includes no processing of L−R signals.
23 Citations
22 Claims
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1-9. -9. (canceled)
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10. A method for processing two input audio channel signals to provide n output audio channel signals wherein n>
- 3 and wherein the n output channel signals include surround channels, comprising;
separating the two input channels into a plurality of corresponding non-bass frequency bands; processing each of the plurality of input channel non-bass frequency bands to provide the corresponding frequency band of a center channel output signal and two non-surround non-center output channel signals; processing at least one of the two non-center non-surround output channel signals to provide a surround output channel signal, wherein the processing the two non-center channel output signals does not include processing a signal representing the difference between the two input channels. - View Dependent Claims (11)
- 3 and wherein the n output channel signals include surround channels, comprising;
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12. A method for processing two input audio channels to provide n output audio channels where n>
- 2, comprising;
dividing the first input channel signal and the second input channel signal into a plurality of corresponding non-bass frequency bands; processing according to a first process a first input channel first frequency band audio signal to provide a first portion of a first frequency band of a center output channel signal; processing according to a second process a input channel first frequency band audio signal to provide a second portion of the first frequency band of the center output channel signal; processing according to a third process a first input channel second frequency band audio signal to provide a first portion of a second frequency band of the center output channel signal; and processing according to a fourth process a second input channel second frequency band audio signal to provide a second portion of the second frequency band of the center output channel signal; wherein the third process is different from the first process and the second process and wherein the fourth process is different from the first process and the second process. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
- 2, comprising;
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20-21. -21. (canceled)
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22. Apparatus for processing two input audio channels to provide n output audio channels where n>
- 2, comprising;
circuitry for dividing the first input channel signal and the second input channel signal into a plurality of corresponding non-bass frequency bands; circuitry for processing according to a first process a first input channel first frequency band audio signal to provide a first portion of a first frequency band of a center output channel signal; circuitry for processing according to a second process a input channel first frequency band audio signal to provide a second portion of the first frequency band of the center output channel signal; circuitry for processing according to a third process a first input channel second frequency band audio signal to provide a first portion of a second frequency band of the center output channel signal; and circuitry for processing according to a fourth process a second input channel second frequency band audio signal to provide a second portion of the second frequency band of the center output channel signal; wherein the third process is different from the first process and the second process and wherein the fourth process is different from the first process and the second process.
- 2, comprising;
Specification