Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1982-06-25
1985-02-12
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329126, 329137, 329145, 375 82, H03D 306, H03K 906
Patent
active
044994273
ABSTRACT:
A frequency-modulated input signal is converted at an adequately high sampling rate into a time-discrete and amplitude-discrete digital signal. This digital signal is applied to a simple transversal filter, having a sloping amplitude characteristic, more specifically having a sin.sup.2 transfer function and a constant group delay time, and to a delay device having a time delay which is equal to the group delay time. The output signal of the filter is applied to a numerator input of a divider (6) and the output signal of the delay device to a denominator input the divider (6) whose quotient contains the frequency corresponding to the amplitude characteristic of the filter. In this manner, a frequency demodulator having a very good AM-suppression and an adequate linearity at broad-band-FM is realized. The divider is formed, in accordance with the "pipeline principle", from a plurality of identically constructed sections corresponding to the number of bit positions of the processed digital signals. As a result thereof a sufficiently high processing speed can be accomplished with very little cost. A correction circuit is provided to avoid faults and inaccuracies, respectively, in the case of small denominators.
REFERENCES:
patent: 3324400 (1967-06-01), Battail et al.
patent: 3813617 (1974-05-01), Blancheville et al.
Demmer Walter
Gutsmann Rolf D.
Lenth Jurgen
Briody Thomas A.
Goodman Edward W.
Grimm Siegfried H.
Mis D. C.
Streeter William J.
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