Foundations of Computing

Lecture # 24Sound Editing: Making SoundsSound Editing and Processingwith AudacityEdit Sound DemoBoost BaseChange PitchChange TempoChange Speed

Making Noise :-)Manufacturing soundsExplosions

Power voice

Speed racerExplosion AlgorithmAdd New Audio TrackGenerate White NoiseBoost Base (All the way)Ad Reverb (Gverb)ShapeCopy and PasteMoveMix and RenderExplosionsGenerate some noise

ExplosionsBoost the base

ExplosionsAdd some reverb

ExplosionsCreate an Envelope to shape the volume

ExplosionsAmplify the front end

Power Voice AlgorithmRecord VoiceTrimDecrease PitchAmplifyBass BoostReverb/EchoPower VoiceRecord some words

Power VoiceTrim off noise at the ends

Power VoiceLower the pitch

Power VoiceAdd Reverb/Echo

Motorbike AlgorithmNew Audio TrackGenerate sawtooth tone at 320 Hz (1 sec)New Audio Track sawtooth tone at 520 Hz (1 sec)Mix and RenderNew Audio TrackPink NoiseMix and RenderSplit into two piecesLower Pitch Going AwayShape/Fade in, Fade outMix and RenderSpeed RacerGenerate a chord

+

Mix and Render

Speed RacerGenerate Pink Noise

Mix and Render with 340 Hz + 520 Hz chord

Speed RacerDo approach - depart with an envelope

Speed RacerLower pitch for going away

Sound ReviewRecording sound: Store an array of amplitudes (voltage measurements)Sampling FrequencyQuantizationDynamic RangeMIDI (object representation)Pitch, delay, duration, timbreSynthesizing an instrumentAttack, dwell, sustain, releaseSpeech RecognitionConverting an audio signal into text

Problems: I want to

to?two?too?

Speech Recognition - problemsDiversity of speechI want a cookieI want a cookieI want a cookie

Speech Recognition - problemsDiversity of speechI want a cookieI want a cookieI want a cookieConfused recognitionI want to flyEye want to cry

Speech Recognition - successSmall number of wordsabout 1000

Clear differences among words

Train recognizer to specific persons voiceSpeech synthesisConverting text into sound

Concatenation of soundWords go together funny

Prosody, the inflection that you speak withVariation changes meaningThat is yours That is yours

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