Signal processing circuits

Details Signal processing circuits Signal processing circuits

B - Operations, Transporting

66

B

328/169, 364/26

B66B 13/26 (2006.01) H03K 17/16 (2006.01)

Patent

CA 1280523

2719US ABSTRACT OF THE DISCLOSURE A detection system for a sliding lift or elevator door comprises at least two sensors for monitoring the door opening. The sensors are arranged to detect the presence of moving irregular shape (e.g. the human form) in the doorway to reverse the opening action of the door or, if already open, to prevent the door from closing. A signal compensation circuit is provided to process the output signals from the sensors in a sense to maintain the outputs equal under steady state conditions. This is achieved by using the output of a first sensor as a quasi reference signal. A comparator compares the output of a second sensor with a quasi reference signal and through a feedback loop modifies the output of the said second sensor in a sense to equal the output of the first sensor. The feedback loop contains a delay circuit which is switchable between a long and a short delay. for slow changes in the output of the second sensor the long delay is effective but for fast changes the delay circuit is switched to provide a short delay. The compensation circuit is effectively desensitised against errors due to drift and other slow varying influences.

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