Dual conversion settop terminal including a system for avoiding

Details Dual conversion settop terminal including a system for avoiding Dual conversion settop terminal including a system for avoiding

1996-12-18

2000-05-02

Peng, John K.

Television

Two-way video and voice communication

User positioning

348 11, 348 10, 348725, 348726, 455 62, 455 63, 455315, 4551971, H04N 710, H04N 544, H04H 102, H04H 700

Patent

active

060578769

ABSTRACT:
An improved multiple conversion CATV settop terminal eliminates the adverse effects of oscillator difference beats by selectively controlling local oscillators and the use of a wideband bandpass filter. The wideband bandpass filter is coupled between the output of an up converter mixer and the input of a down converter mixer. Each mixer receives a second input from its corresponding local oscillator. A system microprocessor is programmed to control each local oscillator such that the oscillator difference beat frequencies are translated out of a following IF filter passband. Once translated, the oscillator difference beat frequencies no longer present a source of distortion to the received information signal.

REFERENCES:
patent: 3639840 (1972-02-01), Shekel et al.
patent: 4195203 (1980-03-01), Sakai et al.
patent: 4225974 (1980-09-01), Miyamoto
patent: 4395777 (1983-07-01), Oki et al.
patent: 4425579 (1984-01-01), Merrell
patent: 4520507 (1985-05-01), Moon
patent: 4972431 (1990-11-01), Keegan
patent: 5222106 (1993-06-01), Satoh et al.
patent: 5361407 (1994-11-01), Sawada et al.
patent: 5388125 (1995-02-01), Toda et al.
patent: 5423076 (1995-06-01), Westergren et al.
patent: 5640697 (1997-06-01), Orndorff
patent: 5752174 (1998-05-01), Matai et al.
patent: 5812928 (1998-09-01), Watson, Jr. et al.

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