Title: Circuit arrangement for digital frequency indication in a radio receiver

Abstract: In a circuit arrangement for digitally indicating the tuned frequency of a radio receiver operating in the AM and FM ranges in which the oscillations of the AM tuning oscillator and of the FM tuning oscillator are amplified, converted to rectangular oscillations, counted by means of electronic counters and then digitally displayed, the oscillations of the AM tuning oscillator and the oscillations of the FM tuning oscillator are amplified by a common broadband amplifier which is sufficiently broadbanded so that the oscillator frequencies for the AM range as well as those for the FM range are both passed and amplified and the coupling of the input of the broadband amplifier to the outputs of the tuning oscillators is so loose that the tuning oscillators are not noticeably detuned by changes in capacity in the broadband amplifier.

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Inventors: Klank, Otto (Arpke, DT)
Rottmann, Dieter (Misburg, DT)

Application Number: 526052
Filing Date: 1974-11-21
Publication_date: 1976-04-06
Assignee: Licentia Patent-Verwaltungs-G.m.b.H. (Frankfurt am Main, DT)
Primary Class(es): 455/144 455/158.3
Other Classes:
US Patent Ref:

3417341	Dec, 1968	Elias	325/317.
3509484	Apr, 1970	Basse	325/455.
3702968	Nov, 1972	Sawairi et al.	325/315.
3753119	Aug, 1973	Close	325/455.

Other Refs:
Primary Examiner: Mayer, Albert J.
Assistant Examiner:
Attorney: Spencer & Kaye