Excavating
Patent
1996-06-21
1998-03-03
Canney, Vincent P.
Excavating
G06F 1100
Patent
active
057243638
ABSTRACT:
An amplitude modulated optical analog signal transmission system with an automatic calibration process is disclosed. The system provides accurate, continuous real-time signal transmission by using two or more optical transmission channels to carry the transmission signal, with the channels automatically synchronized and switched such that one channel carries the signal while the other channel is being calibrated. At least one of the channels is carrying the signal at any time, and the switching of the channels is performed such that them is no apparent perturbation of the signal caused by the calibration process. In the steady state the calibration process reduces the DC offset and gain errors of both optical transmission channels, making their individual responses accurate and substantially identical, so that the output of either channel alone or the average of their outputs, selected at the appropriate times, provide accurate representation of the transmission signal. The calibration cycle repetition rate needs only to be high enough compared to the rate of change of the system errors such as gain and offset drift caused by temperature changes and mechanical stress, to provide the desired error-correction bandwidth, which can be much lower than the system transmission bandwidth. Calibration is performed off-line for each channel, so it does not limit the bandwidth of the channel that is carrying the transmission signal at any given time.
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