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US 7,490,044 B2Granted
Audio signal processing
AssigneeBose Corporation
InventorAbhijit Kulkarni
Life of this patent
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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.
Claims9
A method for processing two input audio channel signals to provide n output audio channel signals 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;
- measuring the amplitude of the audio signal in the two input channels in one of the frequency bands to provide a first channel first frequency band audio signal and a second channel first frequency band audio signal to provide a first channel first frequency band audio signal amplitude and a second channel first frequency band audio signal amplitude;
- determining the correlation between the first channel first frequency band audio signal and the second channel first frequency band audio signal to provide a first frequency band correlation;
- scaling the first channel first frequency band audio signal by a first factor (a(first)) related to the first frequency band correlation and further related to the first channel first frequency band audio signal amplitude and the second channel first frequency band audio signal amplitude, the scaling to provide a first scaled first output channel first frequency band audio signal first portion;
- scaling the second channel first frequency band audio signal by a second factor (a(second)) related to the first frequency band correlation and further related to the first channel first frequency band audio signal amplitude and the second channel first frequency band audio signal amplitude, the scaling to provide a first scaled first output channel first frequency band audio signal second portion;
- and
- combining the first scaled first channel first frequency band audio signal first portion and the first scaled first channel first frequency band audio signal second portion to provide a first frequency band portion of a center channel output audio signal.
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