Telecommunications – Receiver or analog modulated signal frequency converter – Frequency conversion between signal source and receiver
Patent
1980-08-28
1982-12-07
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency conversion between signal source and receiver
455161, 455190, 455197, 455315, H04B 118, H04B 126
Patent
active
043631339
ABSTRACT:
A RF signal converter circuit for connection to the aerial input of an RF superheterodyne receiver. In order to avoid a separate remote control of the converter circuit use is made of the local oscillator radiation which is present at the aerial input of a RF-superheterodyne receiver as an indication of the tuning frequency selected by the user with tuning portion of the said RF superheterodyne receiver. The converter circuit comprises a frequency search circuit in which the frequency of the oscillator radiation is detected, an RF signal selector which is controlled by the frequency search circuit and by means of which the desired RF signal is selected from the RF signals applied to the converter circuit, furthermore comprising a modulator which is also controlled by the frequency search circuit and in which the selected RF signal is modulated on a carrier frequency which is determined by the tuning frequency and the intermediate frequency of the RF superheterodyne receiver.
REFERENCES:
patent: 2618743 (1952-11-01), Scherbatsky
patent: 2958771 (1960-11-01), Mural et al.
patent: 3519939 (1970-07-01), Tashima
patent: 3657543 (1972-04-01), Rose
patent: 4169993 (1979-10-01), Taylor et al.
Bookbinder Marc E.
Briody Thomas A.
Streeter William J.
U.S. Philips Corporation
Wright Laurence A.
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