Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1988-09-06
1990-03-20
Safourek, Benedict V.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455315, 455303, 455304, 455209, H04B 126
Patent
active
049108000
ABSTRACT:
A dual branch receiver in which the frequency of the first local oscillator (32) is offset by a few hundred hertz from the input carrier in order to provide separate wanted and image components. Gain and phase control are provided to compensate for differences between the two branches (12, 14), the image signal being used to provide the required error signals. However in the event of the modulation frequency being equal to the offset frequency, the image signals cannot be distinguished from the wanted signals thus inhibiting gain and phase control. This drawback is overcome in the receiver in accordance with the present invention by wobbling the frequency provided by the first local oscillator (28). The wobbling frequency is preferably sub-audible so as not to be discernable to the ear.
REFERENCES:
patent: 3624507 (1971-11-01), Fukata
patent: 4313219 (1982-01-01), Gabler et al.
patent: 4580101 (1986-04-01), Lax
patent: 4633315 (1986-12-01), Kasperkovitz
patent: 4682117 (1987-07-01), Gibson
patent: 4736390 (1988-04-01), Ward et al.
Safourek Benedict V.
Smith Ralph
U.S. Philips Corporation
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