Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1979-07-27
1980-12-23
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329107, 375 1, 375 34, 375 99, 375104, H03K 1301, H04B 112
Patent
active
042413125
ABSTRACT:
A self-calibrating threshold detector for use with receivers adapted to receive an incoming transmitted signal carrying a prescribed code. The detector comprises a single demodulating channel which includes a mixer having one input receiving the incoming signal and another input receiving a local replica code. During a short time interval, an incorrect local code is applied to the mixer to incorrectly demodulate said incoming signal and to provide a reference level that calibrates the noise propagating through the channel. A sample-and-hold circuit is coupled to the channel for storing a sample of the reference level. During a relatively long time interval, the correct replica code provides an output level which ranges between the reference level and a maximum level that represents incoming signal presence and synchronism with the replica code. A summer subtracts the stored sample reference from said output level to provide a resultant difference signal indicative of the acquisition of the expected signal.
REFERENCES:
patent: 3478268 (1969-11-01), Coviello
patent: 3944938 (1976-03-01), Brouant
patent: 4039749 (1977-08-01), Gordy et al.
patent: 4203071 (1980-05-01), Bowles et al.
Barnes James R.
Frosch Robert A. Administrator of the National Aeronautics and Space
Huang Marshall Y.
Grimm Siegfried H.
Manning John R.
Matthews Marvin F.
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