Frequency detection circuit

A detection circuit and frequency technology, applied in the field of detection circuits, can solve the problems of consuming hardware resources, complexity, and long sampling time, and achieve the effect of simple hardware structure and cost reduction.

Active Publication Date: 2019-07-26
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 its frequency detection method of the present invention will be described below with reference to the relevant drawings. For the sake of clarity and convenience of illustration, the dimensions and proportions of the components in the drawings may be exaggerated or zoomed out. In the following description and / or claims, when it is mentioned that a component is "connected" or "coupled" to another component, it may be directly connected or coupled to the other component or there may be an intervening component; When "directly connected" or "directly coupled" to another component, there are no intervening components, and other words used to describe the relationship between components should be construed in the same manner. For ease of understanding, the same components in the following embodiments are marked with the same symbols.

[0018] see figure 1 , which is a block diagram of the first embodiment of the frequency d...

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Abstract

The invention provides a frequency detection circuit. The frequency detection circuit comprises a digital signal processing circuit and an operational circuit, the digital signal processing circuit generates a plurality of reference intensities according to a digital input signal and a plurality of groups of reference signals, each of the plurality of groups of reference signals has a signal frequency, and the signal frequencies of the plurality of groups of reference signals are different. The operational 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 groups 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 science and technology, touch technology has been widely used in various electronic devices, and 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, an external keyboard or other input peripheral devices that occupy a large area are usually not connected, so touch input can bring great input convenience to users. Based on the booming development of touch input technology in recent years, many types of touch input technologies have been developed, such as capacitive, resistive, electromagnetic and so on. [0003] Today's stylus can apply the above electromagnetic touch technology. The stylus can send out pr...

Claims

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Application Information

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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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