Pulse or digital communications – Repeaters – Testing
Patent
1980-01-23
1982-01-12
Wise, Edward J.
Pulse or digital communications
Repeaters
Testing
375 8, 364725, G10L 100
Patent
active
043107214
ABSTRACT:
Disclosed is a system whereby in a transmit mode analog speech is sampled d converted digitally to 12 bits of accuracy and then fed into a fast Fourier transform (FFT) processor which analyzes the speech into spectral and pitch parameters. These parameters are then quantized into a data stream which acts as an input to a differential phase shift keying modulator. The modulator constructs a multi-tone modem output signal from a 25 tone stack which is converted to an analog signal which is fed into a communications channel. In the receive mode a modem input signal from the communications channel is fed through the same analog to digital converter which was used for input speech. A data stream is now provided which is coupled back into the same digital FFT processor which now operates to provide pitch spectral coefficients which are then separated and used by a synthesizer to reconstruct a speech waveform. The speech waveform is applied to a digital analog converter which is the same converter used to produce the line signal when the processor operates in the transmit mode. The FFT processor implements a single FFT algorithm which is used for both vocoder and modem processing in both the transmit and receive modes.
REFERENCES:
patent: 3617941 (1971-11-01), de Lellis
patent: 3634668 (1972-01-01), Shaffer
patent: 3662108 (1972-05-01), Flanagan
patent: 3681530 (1972-08-01), Manley et al.
patent: 3706929 (1972-12-01), Robinson et al.
patent: 4013956 (1977-03-01), Dornaus et al.
patent: 4085449 (1978-04-01), Walsh et al.
de Lellis, Jr. Joseph
Manley Harold J.
Edelberg Nathan
Goldberg Edward
Kemeny E. S.
Murray Jeremiah G.
The United States of America as represented by the Secretary of
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