16 Sound
16.1 analyze frequency plot of a sound signal
CALLING SEQUENCE :
analyze (w [,fmin,fmax,rate,points])
PARAMETERS :
fmin,fmax,rate,points
: scalars. default values fmin=100,fmax=1500,rate=22050,points=8192;
DESCRIPTION :
Make a frequency plot of the signal w with sampling rate rate.
The data must be at least points long.
The maximal frequency plotted will be fmax, the minimal fmin.
EXAMPLE :
// At first we create 0.5 seconds of sound parameters.
t=soundsec(0.5);
// Then we generate the sound.
s=sin(440*t)+sin(220*t)/2+sin(880*t)/2;
[nr,nc]=size(t);
s(nc/2:nc)=sin(330*t(nc/2:nc));
analyze(s);
16.2 loadwave load a sound <<wav>> file into scilab
CALLING SEQUENCE :
x=loadwave('file-name');
PARAMETERS :
x
: vector
DESCRIPTION :
Read a wav sound file into Scilab. you can transform other sound files
into wav file with the sox program.
See Also :
savewave X, analyze X, mapsound X
16.3 mapsound Plots a sound map
CALLING SEQUENCE :
mapsound (w,dt,fmin,fmax,simpl,rate)
PARAMETERS :
dt,fmin,fmax,simpl,rate:
: scalars. default values dt=0.1,fmin=100,fmax=1500,simpl=1,rate=22050;
DESCRIPTION :
Plots a sound map for a sound. It does FFT at time increments dt.
rate is the sampling rate. simpl points are collected for
speed reasons. fmin and fmax are used for graphic
boundaries.
EXAMPLE :
// At first we create 0.5 seconds of sound parameters.
t=soundsec(0.5);
// Then we generate the sound.
s=sin(440*t)+sin(220*t)/2+sin(880*t)/2;
[nr,nc]=size(t);
s(nc/2:nc)=sin(330*t(nc/2:nc));
mapsound(s);
16.4 savewave save data into a sound <<wav>> file.
CALLING SEQUENCE :
savewave('file-name',x [, rate ]);
PARAMETERS :
- x
: vector
- rate
: a scalar. 22050 is the default value.
DESCRIPTION :
save x into a wav sound file. you can transform other sound files
into wav file with the sox program.
See Also :
loadwave X, analyze X, mapsound X