Time-scale modification of music signals based on polyphase...

Details Time-scale modification of music signals based on polyphase... Time-scale modification of music signals based on polyphase...

2006-01-03

2006-01-03

Donels, Jeffrey W (Department: 2837)

Music

Instruments

Electrical musical tone generation

C704S211000, C704S503000

Reexamination Certificate

active

06982377

ABSTRACT:
A time scale modification method employs separate bands obtained through an analysis polyphase filter bank with separate time-scale modification processing for the bands. The outputs are combined using a synthesis filter bank. Some constraints are imposed on the time-scale modification processing, such a limitation of the range of overlap adjustment values for bands other than the greatest energy band, to eliminate noise due to aliasing and inter-channel phase mismatch. This invention produces output quality considerably higher than conventional time-domain time-scale modification methods for general music signals with computational requirements comparable to those of conventional time-domain time-scale modification methods.

REFERENCES:
patent: 6173255 (2001-01-01), Wilson et al.
patent: 6718309 (2004-04-01), Selly
patent: 6766300 (2004-07-01), Laroche
patent: 2005/0096898 (2005-05-01), Singhal

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