Echo cancellation in multi-frequency differentially encoded digi

Details Echo cancellation in multi-frequency differentially encoded digi Echo cancellation in multi-frequency differentially encoded digi

1990-08-10

1992-11-24

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

379410, H04L 514, H04M 908

Patent

active

051669242

ABSTRACT:
A differentially encoded digital signal waveform is generated as a discrete time representation of a desired analog signal utilizing multi-frequency modulation techniques. The computational capability of present day, industry-standard microcomputers equipped with a floating point array processor or digital signal processor chip is utilized to perform digital frequency encoding and compute both discrete Fourier transforms and inverse discrete Fourier transforms to provide a transmitter and receiver system utilizing suitably programmed microcomputers coupled by a communications channel.

REFERENCES:
patent: 4799214 (1989-01-01), Kaku
patent: 4868874 (1989-09-01), Takatori et al.

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