Patent ID: 7376554

Claim:
A method for digitally encoding sound, comprising: a) splitting an input signal into a primary frequency band and at least one secondary frequency band; b) digitally encoding the part of the input signal in the primary frequency band; c) examining certain characteristics of the input signal in the primary frequency band and corresponding characteristics of the input signal in at least one secondary frequency band in order to find out, whether there is certain resemblance therebetween; and d1) if there is said certain resemblance, extracting certain characteristic features of the process applied to encoding the input signal in the primary frequency band and digitally encoding the part of the input signal in the secondary frequency band or bands using such extracted characteristic features; d2) otherwise replacing such extracted characteristic features with a locally generated, independent set of corresponding features and digitally encoding the part of the input signal in the secondary frequency band or bands using said locally generated, independent set of corresponding features.