Speech encoding apparatus and related decoding apparatus

DETAILED DESCRIPTION It is an object of this invention to provide an improved speech encoding apparatus.
It is another object of this invention to provide an improved decoding apparatus.
A first aspect of this invention provides a speech encoding apparatus comprising means for analyzing a pitch of an input speech signal, and deriving a basic waveform of one pitch of the input speech signal; means for deciding a number of a pair or pairs of pulse elements of a desired frameword, and generating the desired framework in response to the basic waveform; means for encoding the generated desired framework; an inter-element waveform code book containing predetermined inter-element waveform samples which are identified by different identification numbers; and means for encoding inter-element waveforms which extend between the elements of the framework by use of the inter-element waveform code book.
A second aspect of this invention provides a decoding apparatus comprising means for decoding framework coded information into a framework composed of pulse elements; an inter-element waveform code book containing predetermined inter-element waveform samples which are identified by different identification numbers; and means for decoding inter-element waveform coded information into inter-element waveforms by use of the inter-element waveform code book, the inter-element waveforms extending between the elements of the framework.
A third aspect of this invention provides a speech encoding apparatus comprising means for deriving an average of waveforms within one pitches of an input speech signal which occurs during a predetermined interval; means for deciding a framework of the average one-pitch waveform, the framework being composed of elements corresponding to pulses respectively; means for encoding the framework; means for deciding inter-element waveforms in response to the framework, the inter-element waveforms extending between the elements of the framework; and means for encoding the inter-element waveforms