Documentation of generatesweep

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Function Synopsis

`sig=generatesweep(sig,fre1,fre2,amplitude,phase)`

Help text

``` method of class @signal
function sig=generatesweep(sig,fre1,fre2,amplitude,phase)
INPUT VALUES:
sig: original @signal with length and samplerate
fre1: start frequency (Hz)
fre2: stop frequency (Hz)
amplitude: [1]
phase: startphase [0]
phases must be in degrees!
RETURN VALUE:
sig:  @signal

This external file is included as part of the 'aim-mat' distribution package
(c) 2011, University of Southampton
Maintained by Stefan Bleeck (bleeck@gmail.com)
http://code.soundsoftware.ac.uk/projects/aimmat
documentation and everything is on http://www.acousticscale.org
```

Cross-Reference Information

This function calls

Listing of function generatesweep

```

function sig=generatesweep(sig,fre1,fre2,amplitude,phase)

if nargin < 5
phase=0;
end
if nargin < 4
amplitude=1;
end

if nargin <3
disp('GenerateSweep: Error: usage: sig=generatesweep(sig,fre1,fre2[,amplitude,phase])')
end

nr_points=getnrpoints(sig);
sr=getsr(sig);
length=getlength(sig);

from=0+phase;

fre_space=linspace(fre1,fre2,nr_points);    % the change of frequency
t_space=linspace(0,length,nr_points);    % a linear function of time
val=2*pi*t_space.*fre_space;

val=val + phase;

data=sin(val);

data=data*amplitude;

sig=signal(data);
sig=setsr(sig,sr);
sig=setname(sig,sprintf('Sweep from %4.2f kHz to %4.2f kHz',fre1/1000,fre2/1000));```

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