Method and system to quickly determine a weight

Patent metadata

Field	Value
Publication number	US-10024709-B2
Application number	US-201615202261-A
Country	US
Kind code	B2
Filing date	Jul 5, 2016
Priority date	Jul 5, 2016
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A method for determining the weight of an entity/item to be weighed on a weighing device ( 1 ), the weighing device comprising at least a weight sensor and a control unit ( 4 ),
the method comprising the following steps:

/a/ collecting weight raw samples (WSi) of the total weight sensed at the weight sensor(s), at a sampling frequency (F 0 ), and converting each of the weight raw samples (WSi) into digitalized weight raw samples (DSi),
/b/ entering sequentially each of the digitalized weight raw samples (DSi) into a Butterworth filter, the latter issuing filtered weight samples (FSi),
/c/ defining a rolling window (RW) containing a parametrized number NS of latest filtered weight samples (FSi),
/d1/ determining, in the rolling window, the minimum (MIN) and maximum (MAX) values of filtered weight samples,
/d2/ comparing the value of MAX−MIN with regard to a parametrized Threshold (T),
/e/ if MAX−MIN is greater than Threshold (T), repeat steps /a/ to /d2/, and as soon as MAX−MIN is less than Threshold (T), output a final weight value (DV), obtained from one or more of the most recent filtered weight samples.

First claim

The invention claimed is:

1. A weighing device, formed as a bathroom scale or a baby scale, comprising at least a weight sensor and a control unit, the control unit being configured to:
/a/ collect weight raw samples (WSi) of the total weight sensed at the load cells, at a sampling frequency (F 0 ), and converting each of the weight raw samples (WSi) into digitalized weight raw samples (DSi),
/b/ enter sequentially each of the digitalized weight raw samples (DSi) into a Butterworth filter, the latter issuing filtered weight samples (FSi),
/c/ define a rolling window (RW) containing the last NS filtered weight samples (FSi), NS being a parametrized number,
/d1/ determine, in the rolling window, the minimum (MIN) and maximum (MAX) values of filtered weight samples,
/d2/ compare the value of MAX-MIN with regard to a parametrized Threshold (T),
/e/ and as soon as MAX-MIN is less than Threshold (T), output a final weight value (DV), obtained from one or more of the most recent filtered weight samples.

2. The device of claim 1 , further comprising the at least weight sensor is formed as a plurality of load cells and further comprising a display.

3. The device of claim 1 , further comprising an impedance sensor.

4. A system comprising a device as defined in claim 1 , and further comprising a smartphone ( 9 ) configured to display data and weight histograms.

5. A method for determining the weight of an entity/item to be weighed on a weighing device ( 1 ), the weighing device comprising at least a weight sensor and a control unit ( 4 ),
the method comprising the following steps:
/a/ collecting weight raw samples (WSi) of the total weight sensed at the weight sensor(s), at a sampling frequency (F 0 ), and converting each of the weight raw samples (WSi) into digitalized weight raw samples (DSi),
/b/ entering sequentially each of the digitalized weight raw samples (DSi) into a Butterworth filter, the latter issuing filtered weight samples (FSi),
/c/ defining a rolling window (RW) containing a parametrized number NS of latest filtered weight samples (FSi),
/d1/ determining, in the rolling window, the minimum (MIN) and maximum (MAX) values of filtered weight samples,
/d2/ comparing the value of MAX−MIN with regard to a parametrized Threshold (T),
/e/ if MAX−MIN is greater than Threshold (T), repeat steps /a/ to /d2/, and as soon as MAX−MIN is less than Threshold (T), output a final weight value (DV), obtained from one or more of the most recent filtered weight samples.

6. The method of claim 5 , wherein the entity/item is a human individual standing or lying on the weighing device, and wherein at step /e/ the final weight value (DV) is displayed on a display.

7. The method of claim 6 , wherein the Butterworth filter is a second order Butterworth filter.

8. The method of claim 6 , wherein the sampling frequency (F 0 ) is comprised between 20 Hz and 500 Hz.

9. The method of claim 6 , wherein the number NS is less than 100.

10. The method of claim 6 , wherein the parametrized Threshold (T) is predefined and comprised between 100 g and 200 g.

11. The method of claim 6 , wherein the parametrized Threshold (T) is set according to the weight range.

12. The method of claim 5 , wherein the outputted final weight value (DV) is equal to the average of the NS most recent filtered weight sample.

13. The method of claim 5 , wherein all the steps are performed subsequently at the sampling frequency (F 0 ).

Assignees

• Withings

Inventors

• Dassouli Houcine
• Genain Nicolas
• Villard Joffrey
• Debreuil Xavier
• Hutchings Cédric
• Brac De La Perriere Brice

Classifications

• G01G3/142

  Circuits specially adapted therefor · CPC title

• G01G19/44 Primary

  for weighing persons · CPC title

• G01G3/1414

  Arrangements for correcting or for compensating for unwanted effects · CPC title