G - Physics – 10 – L
Patent
G - Physics
10
L
354/47
G10L 19/04 (2006.01) G10L 19/08 (2006.01) G10L 19/12 (2006.01)
Patent
CA 2032520
A method for positioning excitation pulses for a linear predictive coder (LPC) operating according to the multi-pulse principle, i.e. a number of such pulses are positioned at specific time points and with specific amplitude. The time points and the amplitudes are determined from the predictive parameters (ak) and the predictive residue signal (dk), by correlation between a speech representa- tive signal (y) and a composed synthesized signal (y). This can provide all possible time positions for the excitation pulses within a given frame interval. According to the proposed method, the possible time positions are divided into a number (nf) of phase positions and each phase- position is divided into a number of phases (f). These phases are vacant for the first excitation pulse. When this pulse has been positioned, the phase determined for this pulse is denied to the following excitation pulses until all pulses in a frame have been positioned.
Ericsson Canada Patent Group
Telefonaktiebolaget Lm Ericsson
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