Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1979-02-05
1981-11-17
Buczinski, S. C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
250578, 307221C, 358212, 358213, H04N 718
Patent
active
043014712
ABSTRACT:
A time change or moving target indication system utilizing charge-coupled devices (CCD's) for signal processing in which successive integrated samples from individual detectors are loaded into adjacent CCD storage buckets and then clocked to an output device. The output device is any suitable differencing arrangement which samples the charge stored in adjacent buckets and gives an output proportional to the difference. The system of the invention allows the successive signals from individual detectors to pass through virtually identical elements in the signal processing chain so as to reduce the effects of transfer inefficiency on the accuracy of the MTI subtraction process. Further, the signal spectrum from an individual detector output may be shifted to higher frequencies during the readout process so as to reduce the effects of any 1/f noise that may be present in the output device. The concept, in accordance with the invention, may be implemented off the focal plane as well as on the focal plane and may be implemented for a single row of detectors or for a detector array. In the off-focal plane configuration in accordance with the invention, the detectors are sampled at a rate much higher than the system field time to provide a high signal bandwidth which permits additional signal processing such as noise spike suppression and background subtraction to be performed before subsequently integrating the samples from individual detectors over the desired field time.
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French Donald E.
Holscher Donald J.
Adam Walter J.
Buczinski S. C.
Hughes Aircraft Company
MacAllister William H.
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