Audio signal processing

DETAILED DESCRIPTION 1.
A method for processing a single channel audio signal to provide a plurality of audio-channel signals, comprising: separating said single channel audio signal into a first separated signal characterized by a spectral pattern generally characteristic of speech, and a second separated signal; processing said first separated signal to provide a first audio-channel signal; and modifying said second separated signal to produce the remainder of said plurality of audio-channel signals, wherein said modifying includes: dividing said second separated signal into a plurality of signals; and multiplying one of the latter signals by a predetermined factor, and wherein said factor is variable with respect to time.
2.
A method for processing a single channel audio signal to provide a plurality of audio-channel signals, comprising: separating said single channel audio signal into a first separated signal characterized by a spectral pattern generally characteristic of speech, and a second separated signal; processing said first separated signal to provide a first audio-channel signal; and modifying said second separated signal to produce the remainder of said plurality of audio-channel signals, wherein said modifying includes: dividing said second separated signal into a plurality of signals; and multiplying one of the latter signals by a predetermined factor, and wherein said factor applies a gain that is proportional to the time averaged magnitude of said first separated signal divided by the sum of the time averaged magnitude of said first separated signal and the time averaged magnitude of said second separated signal.
3.
A method for processing a single channel audio signal to provide a plurality of audio-channel signals, comprising: separating said single channel audio signal into a first separated signal characterized by a spectral pattern generally characteristic of speech, and a second separated signal; processing said first separated signal to provide a first audio-channel signal; and modifying said second separated signal to produce the remainder of said plurality of audio-channel signals, wherein said modifying includes dividing said second separated signal into a plurality of signals; and time-delaying said second separated signal