Abstract
We describe a technique for suppressing the effects of transmission errors in speech communication by first-order differential PCM. The technique is employed only at the decoder and thus requires no error-detecting or error-correcting coding. A simple algorithm based on the statistics of differences between adjacent received speech samples is used to identify erroneous transmissions. Error correction is achieved by means of an interpolative method. Signal-to-noise ratio measurements and listening experience demonstrate that the system significantly reduces the effects of transmission errors occurring at rates as high as 0.5%–5%.
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