Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Patent
1980-01-25
1983-10-04
Chin, Tommy P.
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
455258, 455265, H04B 116
Patent
active
044083513
ABSTRACT:
In a broadcast signal receiving system, which includes a phase control loop composed of a first mixer having two inputs and an output and arranged to provide at its output a signal proportional to the product of the signals applied to its two inputs, one output being supplied with the received high frequency signal, a voltage controlled oscillator connected for supplying to the other input of the first mixer an alternating voltage of substantially constant amplitude, a first lowpass filter connected to the output of the first mixer for providing a filtered output signal representative of the first mixer output signal with the sum frequency component of that signal suppressed, and means for delivering the output signal of the first low-pass filter to the control input of the oscillator, the received high frequency signal is directly demodulated by multiplication with a local oscillator signal synchronized to a substantially fixed difference to the phase or the carrier phase of the received high frequency signal.
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Phase Locked Loops, by Alain Blanchard, A. Wiley-Interscience Publication, 1976, pp. 241-245.
The Semiconductor Data Library, vol. VI, Motorola Semiconductors Inc., MC1595L MC1495L Multipliers, MC1594L MC 1494L Multipliers.
A Phase Locked AM Radio Receiver, by L. P. Chu, IEEE Transactions on Broadcast and TV Receivers, vol. L%, 1969, pp. 300-308.
Introduction to Operational Amplifier Theory and Applications, by Wait, McGraw-Hill, New York, 1975.
Frequency Synthesis, by V. Kroupa, Griffin & Cie Ltd., London, 1973.
Blum Alfons
Hoffmann Michael
Maurer Robert
Chin Tommy P.
Licentia Patent-Verwaltungs-GmbH
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