Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1979-05-25
1981-06-16
Wolff, John H.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
333 18, 333 28R, 375 14, H04B 314
Patent
active
042739632
ABSTRACT:
An automatic equalizer for digital transmission systems is disclosed including a variable gain amplifier in one branch of a two-branch admittance circuit. The branch including the amplifier includes two frequency-dependent admittances while the other branch is insensitive to frequency. Varying the gain of the amplifier provides a minimum phase network which can be automatically adjusted to compensate for varying lengths and gauges of telephone pairs. This configuration permits digital transmission in the subscriber loop plant at rates up to 200 kilobits per second.
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Bell Telephone Laboratories Incorporated
Myers Randall P.
Nimtz Robert O.
Wolff John H.
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