Method for Signal Processing of Solid-Borne Sound Signals, in Particular in Motor Vehicles, and an Occupant Protection System with Corresponding Signal Processing Unit
First Claim
1. A method for signal processing of solid-borne sound signals, in motor vehicles, comprising measuring the solid-borne sound, using a filter to provide a frequency component of the solid-borne sound, and evaluating this frequency component between a lower operating frequency and an upper operating frequency, characterized in that the filter is a first-order high-pass filter having a −
- 3 dB cut-off frequency that lies between the upper operating frequency and the lower operating frequency.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention relates to a method for signal processing of solid-borne sound signals, in particular in motor vehicles, and a corresponding occupant protection system. A first-order high-pass filter is provided as a filter, wherein the −3 dB cut-off frequency thereof lies between the upper and lower operating frequency.
Thus, not only does the signal delay in the filter become significantly lower, but also the frequencies in the operating range become not equal, but rather components below the cut-off frequency are accordingly damped more heavily, whereby triggering cases not only can be detected earlier, but also non-triggering cases can be reliably detected.
8 Citations
12 Claims
-
1. A method for signal processing of solid-borne sound signals, in motor vehicles, comprising measuring the solid-borne sound, using a filter to provide a frequency component of the solid-borne sound, and evaluating this frequency component between a lower operating frequency and an upper operating frequency, characterized in that the filter is a first-order high-pass filter having a −
- 3 dB cut-off frequency that lies between the upper operating frequency and the lower operating frequency.
- View Dependent Claims (2, 7, 8, 9, 10, 11)
-
3-6. -6. (canceled)
-
12. A vehicle occupant protection system comprising a sensor that is sensitive to solid-borne sounds and produces a corresponding signal, a filter arranged and adapted to provide a frequency component of the signal, and a signal evaluation unit arranged and adapted to evaluate the frequency component between a lower operating frequency and an upper operating frequency, wherein the filter is a first-order high-pass filter having a −
- 3 dB cut-off frequency between the upper operating frequency and the lower operating frequency.
Specification