Ghost canceller

Details Ghost canceller Ghost canceller

1993-03-31

1994-06-28

Powell, Mark R.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

2571831, H04N 521

Patent

active

053251300

ABSTRACT:
A ghost canceller which operates at IF and utilizes a storage mode heterojunction acoustic charge transport device (SM-HACT). The signal delay provided by the SM-HACT is increased by the operation of barrier electrodes which delay the movement of charge packets across the device, thereby eliminating the need for additional digital equalization. The tap weights of the SM-HACT are determined by the operation of a fixed correlator which responds to ghosts in a predetermined training waveform.

REFERENCES:
patent: 4060833 (1977-11-01), Onyshkevych
patent: 5073807 (1991-12-01), Fliegel et al.
Westinghouse Electric Corporation, ESG, "Proposal For Heterojunction Act Equalizer For HDDT" In Response to DARPA BAA#91-06, HDDT Topic Area#4: Processors, (Jun. 4, 1991).
Ciciora, W, Sgrignoli, G, Thomas, W "A Tutorial on Ghost Cancelling in Television Systems", IEEE 0098-3063/79/0400-0009, (Jan. 12, 1979).
Miller, R. L., Bailey, D. S., Blais, P, Henry, G, Sopira, M., Eldridge, G, Messham, R "Critical Fabrication Processes For Programmable HACT DPTFS", IEEE 1051-0117/91/0000-0031, 1991 Ultrasonics Symposium.
Cullen, D. E., Miller, M. J., "First HACT Analog Memory Devices Demonstrated" IEEE Ultrasonics Symposium, Orlando, Fla. (Dec. 8-11, 1991).

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