Demodulators – Frequency modulation demodulator – Having specific distortion – noise or other interference...
Patent
1988-12-15
1990-03-06
LaRoche, Eugene R.
Demodulators
Frequency modulation demodulator
Having specific distortion, noise or other interference...
358327, 329341, H03K 522
Patent
active
049069420
ABSTRACT:
A frequency demodulator which comprises a digital FM demodulating circuit for demodulating an inputted FM signal and outputting a digital demodulated signal, a discriminator for discriminating whether or not the value of the digital demodulated signal from the digital FM demodulating circuit deviates from an upper limit value or a lower limit value set for a normal demodulating range, and a circuit operable on the basis of a result of the discrimination performed by the discriminator for replacing the value of the demodulated signal deviating from the upper limit value or the lower limit value with a compensation value set to a value approximating the upper limit value in the case where the inputted FM signal which has been demodulated is of a type having upper and lower side-bands suppressed and emphasized, respectively, or with a compensation value set to a value approximating the lower limit value in the case where the inputted FM signal which has been demodulated is of a type having upper and lower side-bands emphasized and suppressed, respectively.
REFERENCES:
patent: 4510530 (1985-04-01), Miura et al.
M. Hagiwara et al, "TAN Type FM Demodulator Using Digital Signal Processing Technique", disclosed during the session of the Nationside meeting held by the Electronic Communication Society of Japan in 1983.
IEEE Transactions on Consumer Electronics, vol. CE.32, No. 3, Aug. 1986.
Hatanaka Keiji
Hatano Yoshiko
Nakai Takahiro
LaRoche Eugene R.
Mitsubishi Denki & Kabushiki Kaisha
Pascal Robert J.
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