Sound effects Our project Background & techniques Applications Methodology Results Conclusion
artificially created or enhanced sounds› Delay › Multiple Echo › All pass Reverberation › A Natural Sounding Reverberation › Flanging › Equalizer
plays audio after the delay time from several milliseconds to several
seconds Analog delay Digital delay is used by electric guitarists
Reflection of sound infinite number of echoes in music may produce unpleasant
effect
result of the many reflections of a sound
sound source stops but the reflections continue
number of systems developed to simulate reverberation
simple DSPs use multiple feedback delay circuits
Impulse response of a room
"whooshing" sound created by mixing a signal with a
slightly delayed copy of itself considered a particular type of phasing
effect
allows the user to magnify or dampen any frequencies
Many equalizers change up to 20 different frequency bands
various effects on pre-recorded sound› Delay › Multiple Echo › All pass Reverberation › A Natural Sounding Reverberation
audio file manipulated in visual dsp++
Output produced on sound card
musicians have been using different techniques
Some of these were found by accident effects have not changed much in the
past few years from analog signal processing towards
digital signal processing very precise and easily reproduced
effects
In movies and theaters To make voice listened better in
different environments in a recording studio gives you greater choice of sounds better control over different devices
used For improving the quality of music
Delay:
Open a file in read mode… int R=5000; for(i=0;i<R;i++)
y[i] = x[i];
for(j=R;j<xlen;j++) y[j]= x[j]+x[j-R];
Multiple Echo:
H(Z) = Z-R / (1 - alpha * ( Z-R))
int R=5000; int aa =0.5; for(i=0;i<R;i++) y[i] = x[i];
for(j=R;j<xlen;j++)
y[j]= x[j]+(aa*x[j-R]);
All pass Reverberation:
A Natural Sounding Reverberation: Schroeder's Reverberator
input
output
Different sort of effects and filtering techniques
Sound effects are done digitally allowing for a wider variety of manipulation
By the application of DSP, sound quality can be improved
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