Frequency detection circuit

A detection circuit and frequency technology, applied in the field of detection circuits, can solve the problems of consuming hardware resources, long sampling time, complexity, etc., achieving the effect of simple hardware structure, improving detection efficiency, and improving accuracy

Active Publication Date: 2022-07-08
SITRONIX TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, performing FFT requires a complex hardware architecture, which will greatly increase the cost of the detection circuit. To improve the accuracy of detection, a larger number of sampling points is required, which consumes more hardware resources, so it is also necessary Longer sampling time, thus reducing the detection efficiency of the detection circuit
Although many detection schemes have been proposed before, there is still room for improvement, such as Taiwan Patent No. 201410118241.6

Method used

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Embodiment Construction

[0017] Embodiments of the frequency detection circuit and the frequency detection method thereof of the present invention will be described below with reference to the related drawings. For the sake of clarity and convenience in the description of the drawings, the dimensions and proportions of the components in the drawings may be exaggerated. or rendered in a reduced size. In the following description and / or scope of claims, when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present; When "directly connected" or "directly coupled" to another component, there are no intervening components, and other words used to describe the relationship between the components should be interpreted in the same fashion. For ease of understanding, the same components in the following embodiments are marked with the same symbols for description.

[0018] see figure 1 ,...

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Abstract

The invention provides a frequency detection circuit, which includes a digital signal processing circuit and an arithmetic circuit. The digital signal processing circuit generates a plurality of reference strengths according to a digital input signal and a plurality of sets of reference signals, each of the plurality of reference signals has a signal frequency, and the signal frequencies of the plurality of reference signals are different. The operation circuit is coupled to the digital signal processing circuit, and calculates a signal frequency of the digital input signal according to the plurality of reference intensities and the signal frequencies of the plurality of sets of reference signals.

Description

technical field [0001] The invention relates to a detection circuit, in particular to a frequency detection circuit. Background technique [0002] With the rapid development of technology, touch technology has been widely used in various electronic devices for users to control electronic devices, especially in smart mobile phones, tablet computers and various portable electronic devices. The main reason is that these portable electronic devices Due to the characteristics of portability and small size, there is usually no external keyboard or other input peripheral devices that occupy a large area, so the touch input can bring great input convenience to the user. Based on the vigorous development of touch input technology in recent years, many types of touch input technologies have been developed, such as capacitive, resistive, electromagnetic, and the like. [0003] The above-mentioned electromagnetic touch technology can be applied to the stylus today. The stylus can emit ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/0354G06F3/038G06F3/046G01R23/02
CPCG06F3/03545G06F3/0383G06F3/046G01R23/02
Inventor 蔡宗翰杨镇源林王安
Owner SITRONIX TECH CORP
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