Method and apparatus for providing accurate low noise demodulati

Details Method and apparatus for providing accurate low noise demodulati Method and apparatus for providing accurate low noise demodulati

1989-06-26

1990-10-16

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2503381, 250339, 250351, 250564, G01N 2117, G01N 2135, G01N 2161

Patent

active

049637444

ABSTRACT:
A method and apparatus for accurate low noise demodulation of a modulated multi-signal input waveform. The multi-signal input waveform includes a plurality of sequential signal pulses, each pulse having a first adjacent background signal immediately preceding it and a second adjacent background signal immediately following it in time. The invention provides apparatus for synchronously separating the sequential signal pulses and apparatus for synchronously demodulating each sequential signal pulse. The separating apparatus separates each sequential signal pulse together with its adjacent background signals into one of a plurality of channels according to the sequence order of the pulse. Once the sequential signal pulses are separated into separate channels together with their background signals, the demodulating apparatus in each channel averages the first and second adjacent background signals for each pulse to yield an adjacent average background signal. Each sequential signal pulse is then subtracted from its adjacent average background signal to yield the final demodulated signal, each in its separate amplifier channel parallel to the other channels.

REFERENCES:
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patent: 4029416 (1977-06-01), Hawes
patent: 4606047 (1986-08-01), Wilkinson
patent: 4678914 (1987-07-01), Melrose et al.
patent: 4782232 (1988-11-01), Bernstein et al.
patent: 4874572 (1989-10-01), Nelson et al.
patent: 4874949 (1989-10-01), Harris et al.

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