US 6,983,241 B2
Method and apparatus for performing harmonic noise weighting in digital speech coders
Udar Mittal, Hoffman Estates, Ill. (US); and James P. Ashley, Naperville, Ill. (US)
Assigned to Motorola, Inc., Schaumburg, Ill. (US)
Filed on Oct. 14, 2004, as Appl. No. 10/965,462.
Claims priority of provisional application 60/515581, filed on Oct. 30, 2003.
Prior Publication US 2005/0096903 A1, May 05, 2005
Int. Cl. G10L 19/04 (2006.01)
U.S. Cl. 704—207 8 Claims
OG exemplary drawing
 
1. A method for performing harmonic noise weighting in a digital speech coder, the method comprising the steps of:
receiving a speech input s(n);
determining a pitch period (D) from the speech input;
determining a harmonic noise weighting coefficient εp based on the pitch period;
determining a perceptual noise weighting function WH(z) based on the harmonic noise weighting coefficient; and
transmitting a coded bit stream representing the speech input based on the perceptual noise weighting function.