Abstract: A method and apparatus for address setting for speech recording and replay, includes an apparatus for storing a direct current (DC) voltage with a high frequency signal in the dynamic random access memory (DRAM) as an index for replay. During recording, the user can enter speech of different durations. During replay, the system automatically repeats the exact contents without any other background noise or noise speech at the end of the desired message. The apparatus includes a wave clearer, a direct current voltage generator, a high frequency signal generator, a DC voltage detecting and time setting circuit, a resetter, and a recording and replay signal generator.

Abstract: Improved unvoiced speech performance in low-rate multi-pulse coders is achieved by employing a multi-pulse architecture that is simple in implementation but with an output quality comparable to code excited linear predictive (CELP) coding. A hybrid architecture is provided in which a stochastic excitation model that is used during unvoiced speech is also capable of modeling voiced speech by use of random codebook excitation. A modified method for calculating the gain during stochastic excitation is also provided.