H - Electricity – 03 – D
Patent
H - Electricity
03
D
329/3
H03D 3/18 (2006.01) H04N 9/66 (2006.01)
Patent
CA 1239198
ABSTRACT OF THE DISCLOSURE Disclosed is a demodulating circuit for an amplitude-modulated signal, comprising; an input terminal to be supplied with an input signal comprising at least a modulated carrier signal amplitude-modulated by an information signal, the modulated carrier signal having a predetermined phase; an oscillator means for generating a first demodulating carrier the phase of which is displaced from that of the modulated carrier signal by 90°, and a second demodulating carrier which has the same phase as that of the modulated carrier signal; a first synchronous detector for demodulating the input signal with the first demodulating carrier; a second synchronous detector for demodulating the input signal with the second demodulating carrier; a level detector for detecting the level of a predetermined portion of the demodulated output of the first synchronous detector; a control circuit supplied with the output of the level detector for controlling the oscillator means so that the phase of the second demodulating carrier is synchronous with that of the modulated carrier signal; and an output terminal connected to the second synchronous detector for receiving the demodulated information signal from the second synchronous detector. The demodulator circuitry according to the invention performs stable demodulation function without using limiter, and with the phase of carrier signal for demodulation under the control of it, thus free from dependence of the phase of carrier signals for demodulation on the level of input signals.
480045
Asakura Hisao
Nishimura Yoshikazu
Yasukouchi Yoshimi
Gowling Lafleur Henderson Llp
Sony Corporation
LandOfFree
Am synchronous detecting circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Am synchronous detecting circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Am synchronous detecting circuit will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1306526