Envelope constrained multipulse speech coding

In this paper a new speech coding method will be presented, its base being the multipulse model of speech production. A closeness relationship between natural utterances and synthetic ones can be defined in terms of the speech signal itself: at some intervals, the coding error-that is to say the difference between natural and synthetic signals- is set to a particular value in order to meet pre-stablished signal-to-noise ratio criteria, whereas at some other intervals equality of the envelopes of both signals is the only constrain of the synthesis process. Thus defining the closeness constrains, the optimum multipulse sequence can be found through the minimization of the sum of the absolute values of its samples.