Abstract
Energy in the spectrum channels of the Lincoln Laboratory channel vocoder is sequentially sampled and converted to a logarithmic digital representation and is interspersed with a linear-pitch digital representation. This digital format is transmitted over a single wire channel to the vocoder synthesizer where the digital data are reconverted. On receiving the serial stream of binary data, the demultiplexer performs a bit synchronization and a word synchronization, at the cost of no extra bits. After synchronization, the demultiplexer converts the pitch bits into a pitch pulse train, detects buzz or hiss condition, and makes a digital-to-analog conversion of the spectrum-channel data. The transmission rates for the digital-transmission systems are 4800 and 2400 bits/sec. A magnetic-tape recording of synthesized speech at these rates is played. An analysis of the probability of losing synchronization and average times of reacquisition of synchronization at various error rates is presented.
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