H - Electricity – 04 – B
Patent
H - Electricity
04
B
354/47
H04B 1/66 (2006.01)
Patent
CA 1139884
ABSTRACT OF THE DISCLOSURE Disclosed is a system whereby in a transmit mode analog speech is sampled and converted digitally to 12 bits of accuracy and then fed into a fast Fourier transform (FFT) processor which analyses the speech into spectral and pitch parameters. These parameters are then quantized into a data stream which acts as an input to a differen- tial 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 received 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 trans- mit and receive modes.
354955
Delellis Joseph Jr.
Manley Harold J.
Aspila Kalevi P.
The United States Government As Represented By The Secretary Of
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