Broadcast signal receiving system for directly recovering...

Details Broadcast signal receiving system for directly recovering... Broadcast signal receiving system for directly recovering...

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H04B 1/26 (2006.01) H03D 1/24 (2006.01) H03D 3/24 (2006.01) H03D 7/00 (2006.01) H03J 7/28 (2006.01) H03L 7/18 (2006.01) H04B 1/30 (2006.01)

Patent

CA 1151735

ABSTRACT OF THE DISCLOSURE In a broadcast signal receiving system for directly recovering the modulating signal from a received modulated high frequency signal, which system 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 input 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 an oscillator control circuit connected to the oscillator for causing the phase of its output signal to maintain a predetermined relationship with a high frequency component of the received signal, the oscillator control circuit operates to cause the alternating voltage supplied by the oscillator to the first mixer to differ in phase by substantially 90° from the received signal high frequency component. -1-

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