Coding device selectively connected to a transmission line

Details Coding device selectively connected to a transmission line Coding device selectively connected to a transmission line

1986-10-06

1989-02-21

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 34, 332 11D, H04B 1406

Patent

active

048072508

ABSTRACT:
In a predictive coding device which is for coding an input signal into a coded signal, such as a PCM signal, and for use in combination with a transmission line having an on and an off state wherein the coding device is selectively connected to the transmission line and disconnected therefrom, a code converter (16) operatively coupling the transmission line to produce a mute signal of a predetermined code as a first local output signal and the coded signal as a second local output signal when the transmission line is in the off and the on states, respectively. A local decoder (15) locally decodes either the first or the second local output signal into a local decoded signal for use in coding the input signal into the coded signal. Preferably, the predetermined code is a code which the coded signal has when the input signal carries no information. Usually, the coding device is selectively connected to the transmission line and disconnected therefrom through a digital speech interpolation (DSI) device.

REFERENCES:
patent: 2669608 (1954-02-01), Goodall
patent: 3231674 (1966-01-01), Boyer et al.
patent: 3516022 (1970-02-01), Brolin
patent: 3699446 (1972-10-01), Sainte-Beuve
patent: 4167653 (1979-09-01), Araseki et al.
patent: 4541101 (1985-09-01), Potage et al.
IEEE Transactions on Communications, vol. Com-29, No. 3, Mar. 1981, pp. 337-345; "Design and Performance of a DSI Terminal for Domestic Applications".

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