Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1980-03-05
1982-08-10
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329107, 375 82, 375 94, 375110, H03K 906
Patent
active
043440398
ABSTRACT:
A circuit for demodulating either an MFM (modified frequency modulated) or an FM (frequency modulated) self-clocking-information signal is adapted to measure a time period corresponding to a signal reversion period and quantize the measured time period, whereby the quantized output determines a signal reversion period. Pulses of the number corresponding to the quantized output are generated and clock pulses for demodulating the original data are regenerated based on the above described pulses. In the case where the self-clocking-information signal is MFM, the original data is demodulated by reading the data regenerated based on the said pulses of the number corresponding to the quantized output based on the regenerated clock pulses. In the case where the self-clocking-information signal is FM, the original data is demodulated by reading the specified quantized output based on the above described regenerated clock pulses.
REFERENCES:
patent: 4012697 (1977-03-01), Ballinger
patent: 4059806 (1977-11-01), Vagt, Jr.
patent: 4242754 (1980-12-01), De Pouilly et al.
Nishimura Satoshi
Sugiura Youji
Grimm Siegfried H.
Sanyo Electric Co,. Ltd.
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