Digital channel selecting apparatus

Details Digital channel selecting apparatus Digital channel selecting apparatus

1978-02-21

1980-01-29

Smith, Alfred E.

Tuners

With switching means

Capacitor only modified or substituted by switching

334 15, 334 51, 325459, 325465, H03J 320, H03J 306, H03J 502, H04B 106

Patent

active

041863607

ABSTRACT:
A digital channel selecting apparatus for selecting a channel among a plurality of channels which are distributed in at least a relatively higher and lower frequency regions, wherein a plurality of capacitance elements are coupled in parallel, each constituting a portion of a tuning circuit, such that each capacitance element is individually coupled to a corresponding switching device which is operable responsive to a digital control signal, whereby the total capacitance value associated with the tuning circuit is varied to achieve channel selection, characterized in that a fixed reactance component, such as a fixed inductance component or a fixed capacitance component commonly coupled to said plurality of capacitance elements for constituting the tuning circuit is selectively switched to a different reactance value in a semifixed manner by means of a switching diode for each of the higher and lower frequency regions.

REFERENCES:
patent: 3528044 (1970-09-01), Manicki

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