Pulse or digital communications – Receivers – Amplitude modulation
Patent
1995-09-01
1997-07-29
Bocure, Tesfaldet
Pulse or digital communications
Receivers
Amplitude modulation
375316, 329308, H03D 124
Patent
active
056527683
ABSTRACT:
The demodulation of binary amplitude-modulated carrier signals gives rise to special problems, for example in the case of contactless data carriers, because the RF signal is then also used for generating the operating voltage which is limited to a fixed value when the energy is sufficiently high. Moreover, strong interference signals are often superposed on amplitude-modulated signals. For reliable demodulation in such circumstances, therefore, a control signal is subtracted from the input signal and the values of one polarity of the difference are integrated. In order to generate the control signal, the values of one polarity of a further difference between the input signal and a further control signal which is proportional to the former control signal are continuously integrated so as to form an integral signal which is periodically reduced by a fixed fraction. The control signals are derived from said integral signal in a non-linear fashion, preferably by way of the input characteristic of a transistor.
REFERENCES:
patent: 4253189 (1981-02-01), Lemoussu et al.
patent: 4484154 (1984-11-01), Pavin
Ritter Siegfried
Tobergte Wolfgang
Balconi-Lamica Michael J.
Bocure Tesfaldet
U.S. Philips Corporation
Webster Bryan
LandOfFree
Method of and circuit arrangement for demodulating a digital amp does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of and circuit arrangement for demodulating a digital amp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of and circuit arrangement for demodulating a digital amp will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-638064