Patent · US Active

Filter adaptive frequency resolution

US8266195B2 · kind B2 · utility

3Cited by

3References

22Claims

0Family size

Assignee

Telefonaktiebolaget LM Ericsson (Publ) · SE

Inventors

Anisse Taleb · Sollentuna, SE
Harald Pobloth · Täby, SE
Erlendur Karlsson · Uppsala, SE
Erik Norvell · Stockholm, SE

Key dates

Filing date	Mar 28, 2007
Grant date	Sep 11, 2012
Priority date	—
Expiry date	Nov 27, 2029

Classification

Technology area (CPC H)Electricity
CPC primaryH04S2420/03
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

In signal processing using digital filtering the representation of a filter is adapted depending on the filter characteristics If e.g. a digital filter is represented by filter coefficients for transform bands Nos. 0, 1, . . . , K in the frequency domain, a reduced digital filter having coefficients for combined transform bands, i.e. subsets of the transformed bands, Nos. 0, 1, . . . , L, is formed and only these coefficients are stored. When the actual filtering in the digital filter is to be performed, an actual digital filter is obtained by expanding the coefficients of the reduced digital filter according to a mapping table and then used instead of the original digital filter.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.