Telegraphy – Systems – Simplex-reversing periodic
Patent
1974-12-23
1976-05-11
Mayer, Albert J.
Telegraphy
Systems
Simplex-reversing periodic
178DIG44, 325475, 333 70T, H04N 316
Patent
active
039565858
ABSTRACT:
A ghost canceller for the cancellation of a ghost signal from a complex electrical signal including a desired signal component as well as the ghost is provided wherein an electronically variable delay line of the charge transfer type is incorporated in a negative feedback loop. Bucket-brigade and charge-coupled devices may be employed with associated variable frequency clock oscillators to provide remotely variable delay times in an easily implemented structure.
REFERENCES:
patent: 3482168 (1969-12-01), Sasao
patent: 3599108 (1971-08-01), Gardner
patent: 3613030 (1971-10-01), Fjallbrant
patent: 3809923 (1974-05-01), Esser
patent: 3868516 (1975-02-01), Buss
A. M. Lessman, The Subjective Effects of Echoes in 525- Line Monochrome etc., SMPTE, Vol. 81, p. 907, 12/72.
Urkowitz, H., Analysis & Synth. of Delay Line, etc. IRE Trans. Ckt. Theory, Vol. CT-4, No. 2, 6/57.
Butler Walter J.
Puckette Charles M.
Whitten James R.
Cohen Joseph T.
General Electric Company
Mayer Albert J.
Salai Stephen B.
Squillaro Jerome C.
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