Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1979-08-29
1981-04-28
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455183, H04B 116, H04N 544
Patent
active
042649773
ABSTRACT:
A tuning system for a television receiver includes a phase locked loop (PLL) configuration and an automatic fine tuning (AFT) configuration which are selectively enabled to operate to tune the receiver to nonstandard as well as standard frequency RF carriers which may be provided by cable and master antenna systems. After the selection of a new channel, the operations of the PLL and AFT configurations are sequentially enabled by a mode control apparatus. During the operation of the AFT configuration, an offset detector determines when the frequency of the local oscillator signal is caused to be more than a predetermined offset from its value established during the previous operation of the PLL configuration. In response, the mode control unit reestablishes the operation of the PLL configuration. Channel selection apparatus causes a new channel to be selected after a predetermined number of alternate operating cycles of the two configurations.
REFERENCES:
patent: 4031549 (1977-06-01), Rast
patent: 4041535 (1977-08-01), Rzeszewski et al.
patent: 4077008 (1978-02-01), Rast et al.
patent: 4109283 (1978-08-01), Rast
"Dics-Digital Tuning System For TV Receivers" by N.V. Philips' Gloeilampenfabrieken, Netherlands, 2/1977.
Emanuel P. M.
Ng Jin F.
Rasmussen P. J.
RCA Corporation
Whitacre E. M.
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