MULTIPULSE PROCESSING WITH FREEDOM GIVEN TO MULTIPULSE POSITIONS OF A SPEECH SIGNAL

摘要

In a multipulse processing device for achieving ahigh encoding efficiency without using a high samplingfrequency for an input signal and with a great degree offreedom given to positions of multipulses, an inputspeech signal is subjected by an LPC analyzer/processor 3to LPC analysis of each analysis frame for extraction ofLPC coefficients after sampled by an A/D converter 2.Multipulses are retrieved as a result of decision by amultipulse analyzer 20 with a degree of freedom givenrelative to sampling points of a sampled speech signalsupplied through an auditorily weighting filter 4.Encoded by an encoder 41 and together with k parametersused as an example of the LPC coefficients, retrievedmultipulses are multiplexed by a multiplexer 42 fordelivery to a synthesis side. A multipulse waveformsynthesizer 45 synthesizes a waveform by using decodedmultipulse data and the LPC coefficients.