Method of monitoring a vehicle interior

Details Method of monitoring a vehicle interior Method of monitoring a vehicle interior

1996-07-16

1997-10-14

Swann, Glen

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

340544, 367 93, G08B 1316

Patent

active

056776667

ABSTRACT:
The interior of an automotive vehicle is monitored for incursion by launching primary sound wave pulses into the interior of the vehicle and picking up the primary sound wave pulse together with superimposed reflection and sound signals generated by incursion, etc. The picked-up sound waves are transformed into electrical signals which are decomposed in an A/D converter into a time sequence of digital measurement vector elements which in turn are compared with reference elements by a subtraction process to produce a different vector. Summation of the positive terms of the difference vector and summation of the negative terms of the difference vector to produce positive and negative sums allow the sums to be combined to form a gradient which is added to previous gradients to provide a gradient sum. The alarm is triggered when the gradient sum exceeds a threshold.

REFERENCES:
patent: 4382291 (1983-05-01), Nakauchi
patent: 5424711 (1995-06-01), Muller et al.
patent: 5598141 (1997-01-01), Grasmann et al.

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