H - Electricity – 03 – D
Patent
H - Electricity
03
D
329/20
H03D 3/00 (2006.01)
Patent
CA 1223926
ABSTRACT OF THE DISCLOSURE A demodulation circuit for frequency modulated signals comprises a variable phase shifter supplied with inputted FM signals, a narrow band pass filter having a bandwidth narrower than that of the Curson band for the FM signals, a frequency discriminator, a filter allowing specific frequency components among the FM detected sig- nals detected by the frequency discriminator to pass, and a phase adjuster for adjusting the frequency components. The inputted FM signals are passed through the variable phase shifter and the narrow band pass filter and then FM detected by the frequency discriminator, a portion of the detected output signals being passed through the filter and the phase adjuster. Thereafter, the phase shifter is controlled by the signals, the phase of the FM signals being controlled by the phase shifter in the direction of compressing the frequency deviation for the specific demodulated frequency components in the FM signals, and detected signals are obtained from the frequency discrim- inator.
459235
G. Ronald Bell & Associates
Sharp Kabushiki Kaisha
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