Communications: electrical – Digital comparator systems
Patent
1979-09-17
1980-11-04
Yusko, Donald J.
Communications: electrical
Digital comparator systems
179 1C, 179 2DP, 179 2C, 179 81R, 370 27, H04M 1100, H04Q 314, H04B 342
Patent
active
042322936
ABSTRACT:
A line unit interfaces voice band signals and wide band signals extending from D.C. into the voice band between an analog line and a digital telecommunication facility. The line unit includes an analog to digital converter, a control circuit for generating one of two control signals and a line circuit. The line circuit includes a hybrid circuit in a first signal path for carrying voice band analog signals, and a second signal path for carrying wide band analog signals from the analog line. The signals in either signal path are transmitted to the analog to digital converter for encoding by way of a first switch or a second switch connected in series with the first and second signal paths respectively. The first and second switches are alternately conductive in response to one or the other of the control signals respectively.
REFERENCES:
patent: 3955051 (1976-05-01), Bitzer et al.
patent: 4019149 (1977-04-01), Blomenkamp
patent: 4100373 (1978-07-01), Perkins
patent: 4103112 (1978-07-01), Korsky
patent: 4119815 (1978-10-01), Frankfort et al.
patent: 4149030 (1979-04-01), Foreman
Northern Telecom Limited
Yusko Donald J.
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