Single audio frequency testing method based on embedded system

Abstract

The invention relates to a single audio frequency testing method based on an embedded system. The method comprises the following steps: firstly classifying an input signal by amplitude, and then effectively judging a computed result of CPU of the embedded system according to the classification, at last gaining a detected result. The invention has the advantages that by utilizing pre-classification of the input signal amplitude, limitation caused by using Goertzel algorithm is well solved, so that the method provided by the invention can decode any kind of input signals with different amplitudes; a total amount of calculation is small, real-time is ensured, and then the requirements of the system for performance of a digital signal processor are reduced.

Description

technical field [0001] The invention relates to the field of communication signal processing, and mainly relates to a single audio detection method based on an embedded system used in wired and wireless communication. technical background [0002] In wired and wireless communication systems, single audio signals are often used as signaling and control signals. At the same time, with the rapid development of digital signal processing technology and digital signal processing devices, more and more digital signal processing technologies are used in practical applications. The problem solved by utilizing the analog device, the present invention has a very wide application in the detection of single audio signal. [0003] Commonly used single-tone detection methods include the detection method based on the ordinary DFT algorithm and the detection method based on the Goertzel algorithm. Due to the large amount of calculation based on the DFT algorithm, high requirements are place...

AI Technical Summary

Problems solved by technology

Due to the large amount of calculation based on the DFT algorithm, high requirements are placed on hardware resources, and the data needs to be processed in blocks during calculation, which causes a large delay and is not conducive to real-time processing.

However, the general detection method using the Goertzel algorithm is sensitive to the amplitude of the input signal, and the change of the signal amplitude has a great influence on the accuracy of the detection result, which greatly limits its application occasions.

[0004] Although the existing audio detection algorithms ignore the amplitude change of the input signal, in practical applications, due to the signal loss and noise interference in the transmission process, the amplitude of the final input signal changes in a relatively large range.

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