Television – Two-way video and voice communication – User positioning
Patent
1999-04-30
2000-12-12
Faile, Andrew I.
Television
Two-way video and voice communication
User positioning
348 12, 348725, 455295, 455310, 455301, H04N 710
Patent
active
061605719
ABSTRACT:
A CATV transceiver is provided within an RF shield enclosure. The transceiver circuit includes a diplexer, having fixed value inductors, that is coupleable to a CATV cable plant to receive an RF input signal and to transmit an RF output signal. The RF receiver is coupled to the diplexer and includes a frequency up-converter, a first frequency down-converter and a second frequency down-converter. The up and first down-converters include voltage controlled oscillators that are responsive to a control signal generated from a single oscillator crystal. The second frequency down-converter operates to provide an output signal representative of the RF input signal within a predetermined output frequency pass-band. The RF transmitter is also coupled to the diplexer and provides for the transmission of the RF output signal in response to an input signal. A transceiver controller is coupled through the housing to the up and first down-converters to establish respective modulation frequencies such that the LO-related frequency cross-products due to the concurrent use of the respective modulation frequencies occur outside of the predetermined frequency pass-band.
REFERENCES:
patent: 4569084 (1986-02-01), Takahama
patent: 5355162 (1994-10-01), Yazolino et al.
patent: 5437052 (1995-07-01), Hemmie et al.
patent: 5890051 (1999-03-01), Schlang et al.
patent: 5956098 (1999-09-01), Mizukami et al.
patent: 5966188 (1999-10-01), Patel et al.
Faile Andrew I.
ISG Broadband, Inc.
Rosenberg Gerald B.
Vu Ngoc K.
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