Envelope Calculation By Means of Phase Rotation
AssigneeVEGA Grieshaber KG
InventorsChristian Hoferer, Roland Welle, Werner Reich
Life of this patent
Estimating the term…
Abstract
According to an embodiment of the invention, the received signal of a level sensor is sampled at discrete times, and the sampled values are digitised. New values are obtained from the digitised sample values by rotating the phase through a predetermined angle, which new values are then used together with the digital sample values to calculate the envelope curve.
Claims15
1-14. (canceled)
A method for calculating an envelope-curve value in a level measurement by a level sensor, comprising steps of:
- sampling a received signal of the level sensor at discrete times, resulting in sample values;
- converting the sample values of the sampled received signal into digital sample values;
- calculating a new value for a first digital sample value of the digital sample values by rotating the phase of the sample value through a predetermined angle, for example using a digital filter in the time domain or in the frequency domain;
- and
- calculating an envelope-curve value from the first digital sample value and from the new value calculated by the phase rotation.
A level sensor for calculating an envelope-curve value of an envelope curve and for determining a level, comprising:
- a sampling device sampling at least one region of a received signal at discrete times, resulting in sampling values, and converting the sampled values of the sampled received signal into digital sample values;
- and
- a digital signal processing device:
- calculating a new value for a first digital sample value of the digital sample values by rotating the phase of the sample value through a predetermined angle, for example using a digital filter in the time domain or in the frequency domain;
- and
- calculating an envelope-curve value from the first digital sample value and from the new value calculated by the phase rotation.
A sampling and signal-processing apparatus, comprising:
- a sampling device;
- and
- a processor calculating an envelope-curve value of an analogue signal, designed to perform the following steps:
- sampling at least one region of the analogue signal at discrete times, resulting in sampling values;
- converting the sampled values of the sampled signal into digital sample values;
- calculating a new value for a first digital sample value of the digital sample values by rotating the phase of the sample value through a predetermined angle, for example using a digital filter in the time domain or in the frequency domain;
- and calculating an envelope-curve value from the first digital sample value and from the new value calculated by the phase rotation.
A program element, which, when implemented on a sampling and signal-processing apparatus, instructs the apparatus to perform the following steps:
- sampling at least one region of the analogue signal at discrete times, resulting in sampling values;
- converting the sampled values of the sampled signal into digital sample values;
- calculating a new value for a first digital sample value of the digital sample values by rotating the phase of the sample value through a predetermined angle, for example using a digital filter in the time domain or in the frequency domain;
- calculating an envelope-curve value from the first digital sample value and from the new value calculated by the phase rotation.
Dependencies are inferred from the claim text.