Demodulators – Frequency modulation demodulator – Input signal converted to and processed in pulse form
Patent
1999-04-28
2000-09-19
Mis, David
Demodulators
Frequency modulation demodulator
Input signal converted to and processed in pulse form
329301, 329303, 329318, 329342, 329343, 375324, 375334, 375345, 455214, 4552341, 455337, H03D 300, H03D 318, H04L 2714
Patent
active
061218294
ABSTRACT:
A frequency demodulator of the present invention includes: an amplification section for receiving a frequency-modulated signal and amplifying the frequency-modulated signal based on a gain so as to produce a digital signal having a predetermined level and an inverted signal of the digital signal; a digital demodulation section for receiving the digital signal and frequency-demodulating the digital signal; an amplitude detection section for receiving the digital signal and the inverted signal of the digital signal, and detecting maximum amplitude values of the digital signal and the inverted signal for a predetermined period of time so as to produce an amplitude signal in proportion to the maximum values; and a gain controlling section for varying the gain based on the amplitude signal.
REFERENCES:
patent: 4839905 (1989-06-01), Mantovani
patent: 5430766 (1995-07-01), Ota et al.
patent: 6041084 (2000-03-01), Nagaraj
Mis David
Sharp Kabushiki Kaisha
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