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Key detection method and device

A detection method and technology of a detection device, which are applied in the electronic field, can solve the problem of low success rate of key presses, and achieve the effect of reducing the probability of interference

Active Publication Date: 2012-10-17
JIANGSU HUITONG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] What the present invention aims to solve is the problem that the success rate of key detection is not high because the existing key detection is easily disturbed by the external environment

Method used

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  • Key detection method and device

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Embodiment Construction

[0044] The inventor found that in the existing key detection technology, since the key signal is sampled at a fixed frequency, the signal of the constantly changing external environment is easier to track the frequency of the sampling signal, and then interferes with the sampling signal, resulting in the inability to detect an effective key signal , or mistake the interference signal for a valid key signal. Therefore, the inventor proposes a method of frequency-variable sampling of the button signal, so as to reduce the probability that the sampling signal is affected by external interference signals.

[0045] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the following embodiments use capacitive touch keys as an example for illustration. In other embodiments, the keys are not limited to The capacitive touch key, for example, may also be a resistive ke...

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Abstract

The invention relates to a key detection method and a device. The method is characterized by comprising the following steps: detecting a key to acquire a key signal; and carrying out the frequency-change sampling of the key signal, outputting a control signal when the frequency of sampling effective key signals reaches or exceeds a preset frequency, wherein the frequency-change sampling refers tothe repeated process of progressively increasing a sampling frequency from a first frequency to a second frequency and progressively decreasing the second frequency to the first frequency, and presettime resides in each frequency of the sampling frequency. The invention decreases the interference frequency of the key detection by external signals.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a key detection method and device. Background technique [0002] At present, various types of keys have been widely used in various electronic products, and the success rate of key detection directly affects the use of electronic products. Key detection generally refers to detecting an operation on a key to determine whether the key is pressed. [0003] The existing button detection method comprises the following basic steps: detecting the button, obtaining the button signal; sampling the button signal at a fixed frequency, and when the number of times the effective signal of the button is sampled within a predetermined time range reaches or exceeds the predetermined number of times, output control signal. [0004] During the above-mentioned button detection process, if there is interference from external environmental factors, such as noise interference generated by mobile...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/327G01R27/26
CPCH03M11/003G06F3/023H03K17/9622H03K2217/960705
Inventor 龙涛刘正东龙江
Owner JIANGSU HUITONG GRP
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