Abstract
With the development of information technology, light emitting diode (LED) display screen is widely used in many fields of production and life, such as bus stop reporting, road condition indicator board, building lighting, traffic signal light and KTV music wall. The frequency domain analysis of signal provides a new analysis method for studying the function and characteristics of signal, which is widely used in scientific research and production practice. The emergence of DSP chip and fast Fourier transform (FFT) algorithm provide a unified, economic and monolithic solution for signal frequency domain analysis. Taking the music signal as an example, this paper designs a set of music spectrum display based on LED lattice, so that people can have a more in-depth understanding of the time-domain and frequency-domain representation of the audio signal. In this design, STC12C5A60S2 is used as the processing chip, combined with audio input, sampling, FFT algorithm, A/D conversion, LED display and other functional modules, based on hardware design and software design as the core, to complete the LED display of audio signal spectrum. Through the system function test, the system runs stably, can display the spectrum and its changes of music signal accurately in real time, and meets the expected design requirements.
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