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Method and device for detecting signal frequency

A technology for detecting signals and frequencies, applied in the field of signal processing, can solve problems such as inability to process smoothly, frequently interrupt programs, and no solutions are proposed, and achieve the effect of improving the running speed of the program and reducing the burden.

Active Publication Date: 2016-02-24
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology

[0006] However, this method in the prior art has obvious defects: since the frequency of the square wave signal is often tens of kHz, the interrupt program generated by the rising edge will be very frequent
This causes other programs to be continuously interrupted by the processor and cannot be processed smoothly.
Even when other programs are not finished processing, because the processor receives the interrupt program generated by the rising edge, other programs will be forcibly exited, which will seriously affect the operation of the entire program
[0007] In view of the above problems, no effective solution has been proposed

Method used

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  • Method and device for detecting signal frequency

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Embodiment Construction

[0030] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the scope of protection of this application.

[0031] figure 1 It is a flow chart of a method for detecting a signal frequency provided by an embodiment of the present application. Although the processes described below include multiple operations occurring in a particular order, it should be clearly understood that these processes may include more or fewer operations, which m...

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Abstract

The invention provides a method and device for detecting signal frequency, and the method comprises the steps: receiving a to-be-detected square wave signal inputted by an external clock source pin; counting the trigger edge number of the to-be-detected square wave signal in a preset time duration; and determining the frequency of the to-be-detected square wave signal according to the trigger edge number. The method and device can detect the frequency of the to-be-detected square wave under the condition of not affecting the operation of other programs.

Description

technical field [0001] The present invention relates to the technical field of signal processing, in particular to a method and device for detecting signal frequency. Background technique [0002] In the field of signal processing technology, it is often necessary to convert the signal sensed by the sensor into a frequency signal. Taking the water level sensor of the washing machine as an example, the water level sensor of the washing machine is a device that converts the pressure signal corresponding to the test water level into a frequency signal. The higher the water level, the greater the pressure, and the smaller the frequency of its output. Different manufacturers have different benchmark values ​​for sensor detection, but most of them reach tens of kHz, which is a square wave signal with a high frequency. [0003] To detect the signal frequency, it is often first necessary to calculate the number of square waves in the square wave signal. In the prior art, the numb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/10
CPCG01R23/10
Inventor 王念
Owner GREE ELECTRIC APPLIANCES INC
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