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Influence of Transmission Error on Formant Coded Compressed Speech Signals

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This paper presents an analysis of the performance of the Melpar developed formant tracking speech compression system under the influence of error in the control signals used to communicate the compressed speech information from the analyzer to synthesizer. The analysis is conducted both for analog transmission in which the seven control signal channels of 140 cps aggregate bandwidth are each perturbed by gaussian random noise, and digital transmission in which the seven analog control channels are sampled sequentially into a single binary stream of 1000 bits per second and this subjected to varying degrees of bit error rate. The system on which these experiments have been conducted is being developed under the sponsorship of the Air Force Systems Development Laboratory. In its analog transmission mode, it transmits compressed speech signals in an agtregate bandwidth of 140 cps and attains an articulation rating in excess of 80% for the speech that is synthesized. In its digital mode, it transmits the compressed speech signals in a 1000 bit per second binary coded stream and achieves an articulation rating in excess of 75% for synthesized speech.

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