Patent
1974-06-26
1976-02-24
Mayer, Albert J.
H04B 100, H04B 110
Patent
active
039406946
ABSTRACT:
Data channel gain-variation distortions are reduced by the following combination of operations. Successively occurring data items are cumulatively added in modulo fashion thereby providing a sequence of partial sums. An exponentiating circuit is introduced to provide an exponential function of the partial sums. The exponentiated partial sums are then recorded or transmitted on a data channel wherein the signals are distorted by relatively slow gain variations thereof. The received distorted signals are applied to a logarithmic circuit wherein the multiplicative gain variation distortions are converted to additive distortions. The logarithmically converted signals are applied to a subtractor that sequentially provides the differences in modulo fashion between successively occurring signals from the logarithmic circuit thereby yielding the data items with the distortions substantially reduced.
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patent: 3492578 (1970-07-01), Gerrish
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patent: 3548323 (1970-12-01), Gordon
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patent: 3761610 (1973-09-01), Krallinger et al.
Craig John W.
Price Robert
Cooper Albert B.
Hearn Robert
Mayer Albert J.
Sperry Rand Corporation
Terry Howard P.
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