Perceptual coding of audio signals

Details Perceptual coding of audio signals Perceptual coding of audio signals

H - Electricity

04

B

354/47

H04B 1/66 (2006.01) G06F 3/16 (2006.01) G10L 9/00 (1990.01)

Patent

CA 2027136

A method is disclosed for determining estimates of the perceived noise masking level of audio signals as a function of frequency. By developing a randomness metric related to the euclidian distance between (i) actual frequency components amplitude and phase) for each block of sampled values of the signal and (ii) predicted values for these components based on values in prior blocks, it is possible to form a tonality index which provides more detailed information useful in forming the noise masking function. Application of these techniques is illustrated in a coding and decoding context for audio recording or transmission.

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