Method for digitally filtering a signal burdened with noise and a control system for a vehicle
First Claim
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1. A method for digitally filtering a noise-containing signal for filtering out components of noise, the signal having a fundamental frequency and the method comprising the steps of:
- inputting said noise-containing signal into a digital filter having a filter length (K) less than the period of said fundamental frequency;
filtering out a signal component of an order (m) from said signal based on earlier scanning values of said signal within said filter length (K); and
, outputting a filtered signal value.
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Abstract
A noise-burdened signal is filtered in accordance with a method of digitally filtering to filter out the noise component. The method includes inputting a signal into a digital filter of a filter length (K+1) wherein the filter length is less than the period of the fundamental frequency of the signal. A signal component of an order (m) is filtered from the signal based on earlier scanning values of the signal within the filter length. A filtered signal value is then outputted.
17 Citations
18 Claims
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1. A method for digitally filtering a noise-containing signal for filtering out components of noise, the signal having a fundamental frequency and the method comprising the steps of:
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inputting said noise-containing signal into a digital filter having a filter length (K) less than the period of said fundamental frequency;
filtering out a signal component of an order (m) from said signal based on earlier scanning values of said signal within said filter length (K); and
,outputting a filtered signal value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
scanning said signal at discrete time points (x(n));
utilizing a linear adaptive filter for filtering out said signal component with said linear adaptive filter having a filter coefficient; and
,utilizing a memory for computing said filter coefficient of said linear adaptive filter with said memory containing said earlier scanning values and discrete time points within said filter length (K).
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9. The method of claim 1, comprising the further step of determining a zero crossover of said noise-containing signal utilizing the filtered signal values.
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10. The method of claim 1, wherein said noise-containing signal is the output signal of a sensor for a vibrating system.
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11. The method of claim 10, wherein said vibrating system is a motor vehicle.
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12. A method of controlling the driving dynamic of a vehicle, the method comprising the steps of:
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filtering an output signal of a sensor for detecting a vibration of the vehicle by carrying out the following steps;
(a) inputting said noise-containing signal into a digital filter having a filter length (K) less than the period of said fundamental frequency;
(b) filtering out a signal component of an order (m) from said signal based on earlier scanning values of said signal within said filter length (K); and
,(c) outputting a filtered signal value;
determining a time point of reaching a pregiven value of said output signal utilizing the filtered signal values; and
,controlling one or several driving-dynamic parameters of said vehicle based on said time point. - View Dependent Claims (13, 14)
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15. A computer program comprising a method for digitally filtering a noise-containing signal for filtering out components of noise, the signal having a fundamental frequency and the method comprising the steps of:
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inputting said noise-containing signal into a digital filter having a filter length (K) less than the period of said fundamental frequency;
filtering out a signal component of an order (m) from said signal based on earlier scanning values of said signal within said filter length (K); and
,outputting a filtered signal value.
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16. A control system for at least one driving-dynamic parameter of a vehicle, the control system comprising:
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a sensor for detecting a vibration of said vehicle or a component of said vehicle and for outputting an output signal indicative of said vibration;
computer means for carrying out a method for digitally filtering said output signal in accordance with a method including the steps of;
inputting said noise-containing signal into a digital filter having a filter length (K) less than the period of said fundamental frequency;
filtering out a signal component of an order (m) from said signal based on earlier scanning values of said signal within said filter length (K); and
, outputting a filtered signal value;
said computer means also functioning to determine a time point of reaching a pregiven value of said output signal utilizing said filtered signal value; and
,control means for controlling one or several driving-dynamic parameters of said vehicle based on the determination of said time point. - View Dependent Claims (17, 18)
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Specification