Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1986-04-01
1990-07-24
Harkcom, Gary V.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
G10L 702
Patent
active
049440136
ABSTRACT:
Speech is coded such that it can be generated by a pulse excitation sequence filtered by an LPC (linear preductive coding) filter. The sequence contains, in each of successive frame periods, pulses whose positions and amplitudes may be varied. These variables are selected at the coding end to reduce the error between the input and regenerated speech signals. The selection process involves derivation of an initial estimate followed by an iterative adjustment process in which pulses having a low energy contribution are tested in alternative positions and transferred to them if a reduced error results.
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Gouvianakis Nikolaos
Xydeas Costas
British Telecommunications public limited company
Harkcom Gary V.
Merecki John A.
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