Multirate digital voice communication processor

Details Multirate digital voice communication processor Multirate digital voice communication processor

1980-01-28

1982-05-18

Krass, Errol A.

Multiplex communications

Wide area network

Packet switching

370 84, 179 15R, G10L 100

Patent

active

043306896

ABSTRACT:
To provide alternative operation at 2.4 or 9.6 Kb/s bit rates, a multirate igital processor generates a data frame of 216 bits representing sync and voice encoded at both rates, with the 2.4 Kb/s embedded as a subset within the frame. Rate conversion is made by inserting or deleting 162 bits per frame. Speech signal is transformed by linear prediction into coefficients and residual signals. The coefficients are transmitted similarly at both 2.4 and 9.6 Kb/s rates. However, the residual is processed into a simple pitch/hiss excitation signal for 2.4 Kb/s, but is processed into a Fourier transform of its baseband (250-1500 Hz) for 9.6 Kb/s excitation signal transmission.

REFERENCES:
patent: 3752933 (1973-08-01), Cohen et al.
patent: 3975587 (1976-08-01), Dunn et al.
patent: 3982077 (1976-09-01), Clark et al.
patent: 3987251 (1976-10-01), Texier et al.
patent: 4131765 (1978-12-01), Kahn
patent: 4216354 (1980-08-01), Esteban

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