This paper describes an audio response unit used in data communication services. The speech segments necessary to respond are stored in a large capacity magnetic drum in terms of partial autocorrelation (PARCOR) coefficients and excitation source information. PARCOR coefficient is a new parameter to express accurately the spectrum envelope of speech signals. Multiple speech signals can be synthesized simultaneously by means of a timemultiplexed digital filter composed of a high-speed arithmetic unit. The unit is able to respond to more than 7000 speech segments of 1-s duration.
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Itakura et al. (1972) studied this question.