Digital data over voice communication

Details Digital data over voice communication Digital data over voice communication

1989-04-28

1991-06-18

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

375 18, 375 61, H04J 114

Patent

active

050254430

ABSTRACT:
A method and apparatus is described for transmitting and receiving data signals and voice band signals over a single pair of wires, wherein the energy content of the data signals in the voice band is transferred to a higher frequency to avoid interference between the two. This is accomplished by sinusoidally encoding the data pulses in the frequency domain. The encoding is equivalently performed in the time domain by linearly combining weighted delayed and advanced versions of the data pulses, in accordance with a weighting formula. A transversal filter is used to multiple delayed and advanced versions of the data pulses by a scaling factor times the ratio of m!/m-i)!i! factorial wherein i is the ith version being weighted, m is an integer greater than one and ! indicates the factorial function.

REFERENCES:
patent: 4768206 (1988-08-01), Van Gerwen
"Communication Networks for Computers", D. W. Davies and D. L. A. Barber, 1973, Wiley, (London, GB), Tailoring the Spectrum of the Transmitted Signal, pp. 148-173 cited . . . (note: we received pp. 148, 149, 152, 153, 168, 169, 172, 173 and two unnumbered pages with Search Report).

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