Method and circuit for processing signals for a motion sensor
AssigneeContinental Teves AG & Co. oHG
InventorsWolfgang Fey, Mario Engelmann, Leonhard Link
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Abstract
The present invention relates to a method and a circuit arrangement for processing signals for an active motion sensor which generates at least one first sequence of input pulses that contain motion information. By at least one integrating filter circuit, each input pulse of a pulse train is integrated, and an associated output pulse is generated during a period in which the integrated signal is in excess of a predeterminable second threshold value after a predeterminable first threshold value has been exceeded so that the output pulse has a time delay with respect to the input pulse. As a result, noises of a duration which is shorter than the delay time are effectively suppressed.
Claims10
Method of suppressing signal noise found on the signal generated by an active motion sensor, wherein the signal includes a first sequence of input pulses that contain motion information, comprising the steps of:
- integrating each input pulse so that the integrated signal rises during the input pulse and declines when no input pulse prevails,
- generating an output pulse between a time where the integrated signal is in excess of a predeterminable second threshold value after a predeterminable first threshold value has been exceeded and the time where the integrated signal during the decline lies below the first threshold value after having dropped below the second threshold value so that the output pulse is delayed in time with respect to the input pulse, and
- initiating a current flow upon sensing the input pulse, and initiating charging a charge storage device when the current flow reaches a predetermined value, wherein a charge of the charge storage device is the integrated signal.
Sensor arrangement with an active sensor which generates a first sequence of input pulses that contain motion information, comprising:
- a device for signal processing of the sensor signal, including
- one integrating filter circuit adapted to integrate each input pulse of a pulse train so that the integrated signal rises during the input pulse and declines when no input pulse is present, and
- an output circuit adapted to generate an output pulse between the time where the integrated signal is in excess of a predeterminable second threshold value but less than after a predeterminable first threshold value has been exceeded and the time where the integrated signal during the decline lies below the first threshold value after having dropped below the second threshold value so that the output pulse has a time delay with respect to the input pulse, and
- initiate a current flow upon sensing the input pulse;
- and
- initiate charging a charge storage device when the current flow reaches a predetermined value, wherein a charge of the charge storage device is the integrated signal.
Dependencies are inferred from the claim text.