Stereo oscilloscope and spectrum analyzer

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SUMMARY

This discussion focuses on implementing a stereo oscilloscope and spectrum analyzer using C or MATLAB. The user is familiar with basic MATLAB commands for handling WAV files and has experience creating a simple music synthesizer. To display sound waves in real-time, the user proposes sampling audio input from a microphone every 12.5 milliseconds, which corresponds to a sampling frequency of 800 Hz, adhering to the Nyquist criteria to avoid aliasing for voice frequencies up to 3000 Hz.

PREREQUISITES
  • Understanding of MATLAB audio processing commands
  • Knowledge of the Nyquist theorem and sampling frequency
  • Basic programming skills in C or MATLAB
  • Familiarity with real-time data visualization techniques
NEXT STEPS
  • Research MATLAB's 'audiorecorder' function for real-time audio input
  • Explore C libraries for audio processing, such as PortAudio
  • Learn about digital signal processing (DSP) techniques for audio analysis
  • Investigate methods for real-time plotting in MATLAB or C
USEFUL FOR

Audio engineers, software developers, and hobbyists interested in real-time audio visualization and analysis using MATLAB or C programming.

dx1987
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I need to implement a stereo oscilloscope and spectrum analyzer using C or matlab.. I am familiar with the basic commands regarding wav files in matlab. i also created a very simple music synthesizer.

regarding the stereo oscilloscope, how do you get to display the sound wave in real time?

what i was thinking to do is to have someone speak in a microphone, and this is sampled every for example 12.5ms (determined by sampling freq ) and each point is plotted and the sequence repeats.
 
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You are going to get aliasing at the higher frequencies. The voice spectrum is from 0 to about 3000 Hz which following the Nyquist criteria means that you will have to sample at 6000 Hz.
 

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