Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1982-01-25
1983-10-18
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455200, 455241, 455242, 455251, H04B 116
Patent
active
044110197
ABSTRACT:
An AGC system is described for setting a plurality of different AGC delay points for various channels or bands of channels in a television receiver. In one embodiment, the system includes an AGC control which develops a gain control signal for the UHF and VHF tuners, and an AGC delay circuit which determines the point at which the gain control signal becomes effective to initiate gain reduction in the tuners. Preferably, the delay circuit causes the AGC control to establish a first AGC delay point, corresponding to a given level of incoming signal strength, at which the gain control signal causes the VHF tuner to begin gain reduction, and establishes a different delay point corresponding to a relatively higher level of incoming signal strength at which the gain control signal causes the UHF tuner to begin gain reduction. In another embodiment, a separate AGC delay point is set for channel 6 to provide a more desirable delay point for other channels in the VHF band. The latter embodiment can also provide a customized AGC delay for each channel in the UHF and VHF bands.
REFERENCES:
patent: 3242433 (1966-03-01), Carlson et al.
patent: 3548315 (1970-12-01), Lehmann et al.
patent: 4162452 (1979-07-01), Ash
Ng Jin F.
Zenith Radio Corporation
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