Digital Audio Processing

Digital audio processing includes any process which modifies the digitized audio samples. Typical processes include

• Amplitude processing - modification of the volume, channel mixing, vocal cut, dynamics processing, and normalization
• Delay effects - add echo, reverb, chorus effects
• Filters - modification of the frequency content including FFT filters and graphic equalizers
• Noise reduction - removal of clicks, pops, and hiss reduction
• Special effects - convolution and distortion
• Time/Pitch modification - pitch bending, pitch transformation preserving time, time modification preserving pitch

The following links present a more technical introduction to several digital audio processing topics:

• Mathematical foundations
  • Complex numbers and sines and cosines
  • Time domain and frequency domain models for audio signals
  • Fourier transform (FT)
  • The Discrete Fourier transform (DFT)
  • Fast Fourier transform (FFT)
  • Convolution
  • Impulse response (IR)
  • Sums and products of cos
  • The sample theorem
• Digital audio monitors
  • Digital oscilloscope
  • Spectrum Analyzer
• Amplitude processing
  • Amplitude adjustment
  • Compression
  • Clipper
  • Normalization
  • Panner
• Delay effects
  • Echo
  • Reverb
  • Chorus
  • Flanger
  • Phaser
• Digital filters
  • Low pass, high pass, allpass, and bandpass filters
  • Windowed-sinc filters
  • FIR and IIR filters
  • Comb filters
  • FIR Comb filters
  • IIR Comb filters
  • FFT Convolution
  • Recursive Filters
  • Chebyshev Filters
  • Filter Comparison
• Time/Pitch Changing

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