FIELD: information technology.
SUBSTANCE: signal processing platform (300) presents (101) a signal to be processed and identifies (102) signal portions with specific characteristics that are used (103) to automatically determine at least one bounding frequency that can be used to facilitate bandwidth extension for the signal. Identifying these signal portions can involve identifying signal portions that exhibit at least a predetermined level of energy. The step of determining the bounding frequency can involve computing an amplitude spectrum for each of the identified signal portions that can be used to determine a corresponding measure of flatness within a pass band which pertains to a corresponding normalised signal portion to thereby provide corresponding verified signal portions. Determining the bounding frequency can then involve accumulating the amplitude spectrum for these verified signal portions and using the resultant accumulation to estimate a corresponding signal envelope. This signal envelope can then be used to determine the at least one bounding frequency.
EFFECT: improved sound quality.
6 cl, 3 dwg
