Discussion

1
Discussion 26 Sound II
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Sound Processing II
3
Arithmetic on Sound

• Sound is an array of amplitudes (numbers)
• Adding two sounds together
• Make a sound louder or softer
• Blends of two sounds
• Echos

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Adding Two Sounds


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Adding Two Sounds

• Laser laser gun sound
• Warn warning message
• NewSnd new array(Laser.length)
• for (i0 iltLaser.length ii1)
• NewSndi Laseri Warni

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Adding Sounds Demo

• Cool Edit
• Edit -gt Mix Paste

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Making a Sound Louder
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Amplify Sound Algorithm

• amp 3.0 three times as loud
• for (i0 iltoldSound.length ii1)
• newSoundi oldSoundi amp

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Amplify Sound Demo

• Cool Edit
• Transform -gt Amplitude -gt Amplify

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Blending Two Sounds
90 whistle 10 words
50 whistle 50 words
10 whistle 90 words
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Blending Two Sounds

• B blend value between 0.0 and 1.0
• for (i0 iltoldSnd.length ii1)
• newSndi
• (1.0-B) oldSnd1i
• (B) oldSnd2i

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Blending Sounds Demo

• Cool Edit
• Transform -gt Amplitude -gt Amplify
• Edit -gt Mix Paste

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Singing a Round by Yourself

• Row Row Row your boat

• Sing in a round

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Singing a Round by Yourself


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Singing a round by yourself

• song the original song
• delay how many samples to delay
• newSng new array(song.lengthdelay)
• for (i0 iltsong.length ii1)
• newSngi songi
• for (i0 iltnewSng.length ii1)
• newSngidelay newSngidelaysongi

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Singing a round by yourself Demo

• Cool Edit
• Edit -gt Mix Paste

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Echoes

• An echo occurs because sound returns delayed and
  softer after bouncing off of something

• Original

Canyon Echo (large delay)
Room Reverb (small delay)
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Echoes
sound the original sound delay how many
samples to delay softness 0.1 newSound new
array(sound.lengthdelay) for (i0
iltsound.length ii1) newSoundi
soundi for (i0 iltsound.length
ii1) newSoundidelay newSoundidelay
soundisoftness
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Echoes Demo

• Cool Edit
• Transform -gt Delay Effects -gt Echo

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Speech Recognition

• Converting an audio signal into text

• Problems?
• English
• Homonyms
• Accents

• to
• two
• too

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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

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Speech Recognition - success

• Small number of words
• about 1000
• Clear differences among words
• Train recognizer to persons voice

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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