EP 0774750 A2 19970521 - Determination of line spectrum frequencies for use in a radiotelephone
Title (en)
Determination of line spectrum frequencies for use in a radiotelephone
Title (de)
Bestimmung der Linienspektrumfrequenzen zur Verwendung in einem Funkfernsprecher
Title (fr)
Détermination des fréquences du spectre de raies pour utilisation dans un radiotéléphone
Publication
Application
Priority
- US 678795 P 19951115
- US 73582796 A 19961023
Abstract (en)
An audio signal, such as a speech signal, is applied to a LPC filter. A method is disclosed for determining line spectrum frequencies of the LPC filter, expressed by symmetric and antisymmetric auxiliary polynomials, the zeros of which determine the line spectrum frequencies of the LPC filter. The method includes the steps of (a) expressing the auxiliary polynomials using explicit forms of Chebyshev polynomials; (b) iteratively solving a zero of a first of the polynomials using a zero of the other one of the polynomials; and (c) successively eliminating zeroes from the polynomials by polynomial deflation so as to determine the line spectrum frequencies. Also disclosed is a method for determining the immittance spectrum frequencies. <IMAGE>
IPC 1-7
IPC 8 full level
G10L 19/04 (2013.01); G10L 25/24 (2013.01)
CPC (source: EP)
G10L 19/04 (2013.01); G10L 25/24 (2013.01)
Designated contracting state (EPC)
DE FR GB SE
DOCDB simple family (publication)
EP 0774750 A2 19970521; EP 0774750 A3 19980805; EP 0774750 B1 20030205; DE 69626088 D1 20030313; DE 69626088 T2 20031009
DOCDB simple family (application)
EP 96308081 A 19961107; DE 69626088 T 19961107