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Mastering Sound Editing with Audacity: Techniques for Boosting and Shaping Audio Effects

Discover the art of sound editing and processing with Audacity in our comprehensive lecture. Learn how to create dynamic audio effects, such as boosting bass, changing pitch, tempo, and speed, and adding reverb to voice recordings. Explore techniques for crafting explosions, generating noise, and synthesizing sounds. Delve into speech recognition and synthesis, including challenges in audio conversion. With practical demonstrations and hands-on exercises, you'll gain the skills to expertly manipulate audio to achieve professional results.

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Mastering Sound Editing with Audacity: Techniques for Boosting and Shaping Audio Effects

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  1. Lecture # 24 Sound Editing: Making Sounds

  2. Sound Editing and Processingwith Audacity

  3. Edit Sound Demo • Boost Base • Change Pitch • Change Tempo • Change Speed

  4. Making Noise :-)

  5. Manufacturing sounds • Explosions • “Power voice” • Speed racer

  6. Explosion Algorithm • Add New Audio Track • Generate White Noise • Boost Base (All the way) • Ad Reverb (Gverb) • Shape • Copy and Paste • Move • Mix and Render

  7. Explosions • Generate some noise

  8. Explosions • Boost the base

  9. Explosions • Add some reverb

  10. Explosions • Create an Envelope to shape the volume

  11. Explosions • Amplify the front end

  12. Power Voice Algorithm • Record Voice • Trim • Decrease Pitch • Amplify • Bass Boost • Reverb/Echo

  13. Power Voice • Record some words

  14. Power Voice • Trim off noise at the ends

  15. Power Voice • Lower the pitch

  16. Power Voice • Add Reverb/Echo

  17. Motorbike Algorithm • New Audio Track • Generate sawtooth tone at 320 Hz (1 sec) • New Audio Track sawtooth tone at 520 Hz (1 sec) • Mix and Render • New Audio Track • Pink Noise • Mix and Render • Split into two pieces • Lower Pitch Going Away • Shape/Fade in, Fade out • Mix and Render

  18. Speed Racer • Generate a chord + Mix and Render

  19. Speed Racer • Generate Pink Noise • Mix and Render with 340 Hz + 520 Hz chord

  20. Speed Racer • Do approach - depart with an envelope

  21. Speed Racer • Lower pitch for going away

  22. Sound Review • Recording sound: • Store an array of amplitudes (voltage measurements) • Sampling Frequency • Quantization • Dynamic Range • MIDI (object representation) • Pitch, delay, duration, timbre • Synthesizing an instrument • Attack, dwell, sustain, release

  23. Speech Recognition • Converting an audio signal into text • Problems: “I want to” • to? • two? • too?

  24. Speech Recognition - problems • Diversity of speech • I want a cookie • I want a cookie • I want a cookie

  25. Speech Recognition - problems • Diversity of speech • I want a cookie • I want a cookie • I want a cookie • Confused recognition • I want to fly • Eye want to cry

  26. Speech Recognition - success • Small number of words • about 1000 • Clear differences among words • Train recognizer to specific person’s voice

  27. Speech synthesis • Converting text into sound • Concatenation of sound • Words go together funny • Prosody, the inflection that you speak with • Variation changes meaning • That is yours • That is yours

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