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Signal sampling method and sensing system

A sensing system and signal technology, applied in the direction of instruments, computing, electrical digital data processing, etc., can solve the problems of unsuitable sensing area, limited number of samples in a single cycle, limited, etc., and achieve the effect of improving the limited selection

Inactive Publication Date: 2020-08-21
PIXART IMAGING INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The number of frames processed by the control unit per second has a minimum limit, so the number of single-cycle samples that can be selected will be limited by the frame rate
In addition, some single-cycle sampling numbers may not be applicable to all sensing areas, so the selection of single-cycle sampling numbers will be more limited

Method used

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  • Signal sampling method and sensing system
  • Signal sampling method and sensing system
  • Signal sampling method and sensing system

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Embodiment Construction

[0031] figure 1 A block diagram of a capacitive sensing system according to an embodiment of the invention is shown. Such as figure 1 As shown, the capacitive sensing system 100 includes a capacitive sensing matrix CM, a first sampling device SA_1 and a first analog-to-digital converter AD_1. The capacitive sensing matrix CM includes a plurality of capacitive sensing units, but only the first capacitive sensing unit SR_1 and the second capacitive sensing unit SR_2 are marked in this embodiment. The first sampling device SA_1 samples the capacitance value of the first capacitive sensing unit SR_1 with the first single-cycle sampling number to generate the first sensing signal SS_1, and samples the capacitance value of the second capacitive sensing unit with the second single-cycle sampling number to generate the second sensing signal SS_2. That is to say, the first sampling device SA_1 in this embodiment can use different single-period sampling numbers to sample the capacita...

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Abstract

The invention discloses a signal sampling method, which is used on a sensing system comprising a sensing matrix. The sensing matrix comprises a first sensing region and a second sensing region. The signal sampling method comprises the following steps of (a) sampling a sensing value of the first sensing region by the first single period sampling number so as to generate a first sensing signal according to a sensing value; (b) sampling a sensing value of a second sensing region by using a second single period sampling number so as to generate a second sensing signal, wherein the values of the first single period sampling number and the second single period sampling number are different. The sampling is performed on different sensing regions by using different single period sampling numbers, so that the selection range of the single period sampling number is wider.

Description

technical field [0001] The present invention relates to a signal sampling method and a sensing system, in particular to a signal sampling method and a sensing system that allow different sensing regions to use different single-period sampling numbers. Background technique [0002] A conventional capacitive sensing device usually includes a capacitive sensing matrix, and each capacitive sensing matrix includes a plurality of sensing regions, for example, a plurality of capacitive sensing units (cells). Traditionally, the sensing signals generated by these sensing areas are sampled with the same single cycle sampling number. The number of samples in a single cycle refers to the number of samples in a fixed cycle, for example, 100 samples in 1 ms. However, the conditions of each sensing region are different, so the same number of samples per cycle may not be optimal for each sensing region. Moreover, such a method will greatly limit the selection of the number of samples take...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/044
CPCG06F3/044
Inventor 李佳益
Owner PIXART IMAGING INC