Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1979-06-29
1981-09-29
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329104, 329122, 375 25, 375 94, H03K 1301
Patent
active
042925932
ABSTRACT:
The invention relates to a method of demodulating a quadphase coded data signal and a receiver for carrying out the method. The quadphase code comprises four elementary wave forms, each wave form representing two bits of the original non-coded binary signal. An elementary wave form consists of four half bit intervals, the signal corresponding to the first and the second bit, respectively, being transmitted in the first and the second half bit interval and the signal corresponding to the inverted value of the first and the second bit, respectively, being transmitted in the third and the fourth half bit interval. In a receiver according to the invention such a signal is sampled in each of the four half bit intervals. In principle all information is already available after the sampling operations in the first and the second half bit interval, but by utilizing all four samples a proper protection from noise, interference and zero level shifts is obtained. The receiver determines the difference of the samples taken in the first and the third half bit interval and the difference of the samples taken in the second and the fourth bit interval. A positive difference represents a logic 1, a negative difference a logic 0.
REFERENCES:
patent: 3716780 (1973-02-01), Van Elk et al.
Carasso Marino G.
de Jager Frank
Van Doorn Rudolf A.
Verboom Johannes J.
Briody Thomas A.
Goodman Edward W.
Grimm Siegfried H.
Streeter William J.
U.S. Philips Corporation
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