Music beat detection device and its method

Abstract

A device for detecting music beats comprises a sound signal input module, a beat acquisition circuit module, a beat processing module and a beat output module, which are sequentially connected, wherein the beat acquisition circuit module is used for sampling a sound signal of music received by the sound signal input module, filtering a high-frequency signal from the sound signal, extracting a low-frequency signal from the sound signal, and converting the low-frequency signal to digital low-frequency signal with high and low levels; the beat processing module is used for performing digital filtering to the inputted digital low-frequency signal, generating accurate digital beat signal, and outputting via the beat output module. The invention integrates simple hardware circuit and common digital filtering processing, so as to reduce the complexity of signal processing and improve the processing speed; and can be used for producing toys capable of giving rapid response to music beat signals, with low cost and high interactivity.

Description

technical field [0001] The invention relates to the technical field of beat tracking for music translation, in particular to a music beat detection device and a method thereof. Background technique [0002] In the current prior art, beat detection generally directly samples the music sound wave, obtains an analog signal and converts it into a digital signal through A-D, and finally performs data spectrum analysis and Fast Fourier Transform (FFT, Fast Fourier Transform) operation, thereby Get the beat of the song. Such a method needs to analyze a large amount of data, and the FFT operation is more complicated, and it is more difficult to implement on an ordinary 8-bit computer, and the cost is also relatively high. [0003] Aiming at the above-mentioned defects, the Chinese patent application number is "CN92234028.5" and the utility model patent named "a lighting controller" directly adopts hardware circuit filtering to obtain the beat of the music to overcome the above-ment...

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Problems solved by technology

[0004] However, since the audio signal of the music is a relatively weak signal, and the light controller circuit of this patent does not amplify the audio signal during the input process, it is possible to miss some of the beats; secondly, The light controller circuit uses a threshold voltage detection circuit for peak detection. In this part of the processing, a threshold voltage signal needs to be given to compare with the low-frequency signal. This processing method makes the output of the high-level signal directly dependent on the threshold voltage signal. The selection

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