Receiver for satellite broadcast

Abstract

Abstract PURPOSE:To demodulate even plural sound subcarriers different from the maximum frequency shift into the sound signal of a prescribed level by means of a band pass filter by varying the oscillation frequency of a VCO in response to the frequency deviation of a selected sound subcarrier. CONSTITUTION:A demodulation signal from a sound demodulator 10 is fed to a feedback circuit 23. The feedback circuit 23 converts the given demodulation signal to a feedback voltage corresponding to the maximum frequency shift of the selected sound subcarrier. The feedback voltage is given as a control signal to the VCO15 to change the oscillating frequency of the VCO15 in response to the frequency shift of the selected sound subcarrier. Thus, an IF signal having a prescribed frequency shift is obtained from a frequency mixer 14. Thus, even plural sound subcarriers different from the maximum frequency shift are demodulated into the sound signal of a prescribed level by a band pass filter.

Inventors

• 👤 Koji Kamata
• 👤 浩司 鎌田
• 👤 Wataru Okubo
• 👤 亘 大久保

Bibliographic Details