Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1988-08-17
1989-08-29
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329145, 358327, 358330, 358 23, 360 30, H03D 300
Patent
active
048620998
ABSTRACT:
A frequency demodulator includes an analog-to-digital converter for converting an inputted FM signal into a digital signal. A 90.degree. phase shifter is used to phase shift the converted digital signal. The phase shifted signal and the converted signal are utilized to determine the results of tan.sup.-1 (X/Y). X represents the converted signal, and Y represents the phase shifted signal. The result from the calculation is delayed for a period of time equal to one sampling cycle. The frequency demodulator also includes a subtractor for subtracting the delayed signal from the calculation result. A discontinuity corrector corrects any discontinuity in an output from the subtractor, and a reversal phenomenon compensator compensates the output from the discontinuity corrector when the output from the discontinuity corrector exceeds a predetermined range of levels. These levels correspond to an appearance of discrete lines of black or white color on a reproduced picture.
REFERENCES:
patent: 4455533 (1984-06-01), Moraillon
"Experiments on VTR Digital Signal Processing"; Karou Kobayashi; pp. 355-361, IEEE Transactions on Consumer Electronics, vol. CE-32, No. 3, Aug. 1986.
Hatanaka Keiji
Hatano Yoshiko
Nakai Takahiro
Grimm Siegfried H.
Mitsubishi Denki & Kabushiki Kaisha
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