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Manipulating Digital Audio

Manipulating Digital Audio. Digital Manipulation. Extremely powerful manipulation techniques Cut and paste Filtering Frequency domain manipulation Significantly reduced noise problems Error detection and recovery. Cut and Paste. Cut and Paste. Cut and Paste. Effects.

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Manipulating Digital Audio

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  1. Manipulating Digital Audio

  2. Digital Manipulation • Extremely powerful manipulation techniques • Cut and paste • Filtering • Frequency domain manipulation • Significantly reduced noise problems • Error detection and recovery

  3. Cut and Paste

  4. Cut and Paste

  5. Cut and Paste

  6. Effects • There are many manipulation techniques that can be used to change the digital audio • Remove noise • Add reverb • Increase dynamic range • Filter boost or attenuate particular frequencies • Alter Pitch/Tempo

  7. Delay and Echo • Repeating the the sound at a delayed time can have the following effects • >35ms discrete echoes • 35<>15 simple chorus effect • 15< spatially locate a mono sound • Echo is a repeated delayed sample that decays

  8. Flanging • Flanging involves a time delay and a phase shift • Gives a psychedelic sound to audio

  9. Reverb • Reflections are characterised by relative loudness and delay • Digital reverberation is ideally suited to changing these characteristics to simulate different acoustical environments • Reverb is different from the basic echo function in that the delays are not repeated at regularly spaced intervals

  10. Reverb

  11. Graphic Equaliser • Enables the boosting or attenuation of the signal at particular frequency bands

  12. Filtering • Before • After

  13. Pitch Stretching • Changing the frequency of the wave • Increasing the pitch transposes frequencies high up the range

  14. Tempo • Duration of the wave

  15. Amplitude Envelope • This specifies the amplification with respect to time • Enables the fading in or out of sounds

  16. Amplitude Dynamic Range Processing • Varies the output amplitude of a waveform, based on its input level • Can boost low amplitude (quite sounds) • Can attenuate high amplitude (loud sounds)

  17. Channel Mixing Left Right

  18. Pan and Balance • Pan • The proportion of a mono signal which is fed to left or right speakers • Balance • The relative attenuation of each channel of a stereo signal

  19. Multiple Tracks

  20. Fin Fin

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