Reduced power consumption method for sampling parameters within a TPMS
First Claim
1. An apparatus for measuring parameter values from an electrical input signal, the apparatus configured to obtain a respective parameter value for each of a plurality of sampling periods, and the apparatus comprising:
- a signal sampling device operable to sample said input signal and to produce a corresponding output comprising a measured parameter value;
a signal level detector configured to detect changes in the level of said input signal by more than a threshold amount; and
a controller co-operable with said signal sampling device and said signal level detector and being configured to operate said signal sampling device to sample said input signal in response to said signal level detector detecting the changes in said input signal level by more than said threshold amount, wherein, for sampling periods in respect of which said signal level detector detects a change in said input signal level by more than said threshold amount, said controller is configured to obtain said respective parameter value by operating said signal sampling device to sample said input signal, and for sampling periods in respect of which said signal level detector does not detect a change in said input signal level by more than said threshold amount, said controller is configured to use a previously obtained parameter value as said respective parameter value.
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Abstract
An apparatus for measuring parameter values from an electrical input signal comprises a signal sampling device operable to sample the input signal and to produce a corresponding output comprising a measured parameter value; a signal level detector configured to detect changes in the level of the input signal by more than a threshold amount; and a controller co-operable with the signal sampling device and the signal level detector. The controller is configured to operate the signal sampling device to sample the input signal in response to the signal level detector detecting a change in the input signal level by more than the threshold amount.
4 Citations
26 Claims
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1. An apparatus for measuring parameter values from an electrical input signal, the apparatus configured to obtain a respective parameter value for each of a plurality of sampling periods, and the apparatus comprising:
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a signal sampling device operable to sample said input signal and to produce a corresponding output comprising a measured parameter value; a signal level detector configured to detect changes in the level of said input signal by more than a threshold amount; and a controller co-operable with said signal sampling device and said signal level detector and being configured to operate said signal sampling device to sample said input signal in response to said signal level detector detecting the changes in said input signal level by more than said threshold amount, wherein, for sampling periods in respect of which said signal level detector detects a change in said input signal level by more than said threshold amount, said controller is configured to obtain said respective parameter value by operating said signal sampling device to sample said input signal, and for sampling periods in respect of which said signal level detector does not detect a change in said input signal level by more than said threshold amount, said controller is configured to use a previously obtained parameter value as said respective parameter value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A tire monitoring apparatus comprising an apparatus for measuring parameter values from an electrical input signal, the apparatus for measuring parameter values configured to obtain a respective parameter value for each of a plurality of sampling periods and, the apparatus for measuring parameter values from said electrical input signal comprising:
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a signal sampling device operable to sample said input signal and to produce a corresponding output comprising a measured parameter value; a signal level detector configured to detect changes in the level of said input signal by more than a threshold amount; and a controller co-operable with said signal sampling device and said signal level detector and being configured to operate said signal sampling device to sample said input signal in response to said signal level detector detecting a change in said input signal level by more than said threshold amount, wherein, for sampling periods in respect of which said signal level detector detects a change in said input signal level by more than said threshold amount, said controller is configured to obtain said respective parameter value by operating said signal sampling device to sample said input signal, and for sampling periods in respect of which said signal level detector does not detect a change in said input signal level by more than said threshold amount, said controller is configured to use a previously obtained parameter value as said respective parameter value. - View Dependent Claims (25)
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26. A method of measuring parameter values from an electrical input signal, the method comprising:
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detecting changes in the level of said input signal by more than a threshold amount; operating a signal sampling device to sample said input signal in response to a signal level detector detecting a change in said input signal level by more than said threshold amount; and obtaining a respective parameter value for each of a plurality of sampling periods, wherein, for sampling periods in respect of which said signal level detector detects a change in said input signal level by more than said threshold amount, obtaining said respective parameter value by operating said signal sampling device to sample said input signal, and for sampling periods in respect of which said signal level detector does not detect a change in said input signal level by more than said threshold amount, using a previously obtained parameter value as said respective parameter value.
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Specification