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Image and Sound Editing

Image and Sound Editing. Raed S. Rasheed 2012. Digital Sound. Pitch digital sound Echo digital sound Fade in digital sound Fade out digital sound. Pitch digital sound.

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Image and Sound Editing

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  1. Image and Sound Editing Raed S. Rasheed 2012

  2. Digital Sound • Pitch digital sound • Echo digital sound • Fade in digital sound • Fade out digital sound

  3. Pitch digital sound • Is the process of changing the speed or duration of an audio signal. The simplest way to change the duration or pitch of a digital audio clip is to resample it. This is a mathematical operation that effectively rebuilds a continuous waveform from its samples and then samples that waveform again at a different rate. When the new samples are played at the original sampling frequency, the audio clip sounds faster or slower

  4. Pitch digital sound

  5. Pitch digital sound ALGORITHM Sound_Pitch 8.1 01 INPUTSound, rate 02 OUTPUTNewSound 03 BEGIN 04 Create new sound file NewSound; 05 SET index = 0, c = 0; 06 WHILE index < Sound.Length 07 SETi= tranc(index); 08 SET frac= index - i; 09 SET S1 = Sound[i]; 10 SET S2 = Sound[i+1]; 11 SET NewSound[c] = S1 + ( S2 – S1) * frac; 12 SET c = c+1; 13 SET index = index + rate; 14 END WHILE 15 RETURN NewSound; 16 END

  6. Echo (Reverb ) digital sound • is the persistence of sound in a particular space after the original sound is produced. A reverberation, or reverb, is created when a sound is produced in an enclosed space causing a large number of echoes to build up and then slowly decay as the sound is absorbed by the walls and air.

  7. Echo (Reverb ) digital sound

  8. Echo (Reverb ) digital sound ALGORITHM Sound_Echo 8.2 01 INPUTSound, delay, decay 02 OUTPUTNewSound 03 BEGIN 04 SETdelaySample = delay; 05 SETi = 0; 06 WHILEi < Sound.Length 07 IF i < delaySampleTHEN 08 SET NewSound[i] = Sound[i]; 09 ELSE 10SET NewSound[i] = Sound[i] + Sound[i- delaySample] * decay; 11 END IF 12SET i= i + 1; 13END WHILE 14 RETURN NewSound; 15 END

  9. Fade in digital sound ALGORITHM Sound_FadeIn 8.3 01 INPUT Sound 02 OUTPUTNewSound 03 BEGIN 04 SETdecayRate = 1 / Sound.Length; 05 SETdecay = 0; 06 SETi = 0; 07 WHILEi < Sound.Length 08 SET NewSound[i] = Sound[i] * decay; 09 SET i= i + 1; 10 SET decay= decay+ decayRate; 11END WHILE 12 RETURN NewSound; 13 END

  10. Fade out digital sound ALGORITHM Sound_FadeOut 8.4 01 INPUT Sound 02 OUTPUTNewSound 03 BEGIN 04 SETdecayRate = 1 / Sound.Length; 05 SETdecay = 1; 06 SETi = 0; 07 WHILEi < Sound.Length 08 SET NewSound[i] = Sound[i] * decay; 09 SET i= i + 1; 10 SET decay= decay - decayRate; 11END WHILE 12 RETURN NewSound; 13 END

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