Channel selecting apparatus for use with plural tuning devices

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17910011, 325464, 360 33, H04B 116

Patent

active

041829913

ABSTRACT:
Channel selecting apparatus for use with at least first and second tuning devices, each tuning device being responsive to a channel selecting signal supplied thereto for being tuned to a corresponding frequency. At least first and second selectors are provided for producing first and second selector signals, respectively, representing those channels to which the first and second tuning devices are tunable. A set of adjustable elements, common to all of the tuning devices are settable to produce respective channel selecting signals. At least first and second sampling circuits, associated with the first and second tuning devices, respectively, are responsive to first and second phases, respectively, of a switching signal to sample a channel selecting signal applied thereto. A set of switching circuits is provided, each switching circuit being coupled to a respective one of the adjustable elements to receive a respective first selector signal and a respective second selector signal. Each switching circuit is conditioned by the first phase of the switching signal to enable the channel selecting signal produced by the adjustable element coupled thereto to be applied to the first sampling circuit if a first selector signal is supplied thereto, and each switching circuit is conditioned by the second phase of the switching signal to enable the channel selecting signal produced by the adjustable element coupled thereto to be applied to the second sampling circuit if a second selector signal is supplied thereto. The channel selecting signals sampled by the first and second sampling circuits are applied to the first and second tuning devices, respectively.

REFERENCES:
patent: 3699359 (1972-10-01), Shelby
patent: 4031548 (1977-06-01), Kato et al.

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