Re: Octave code request ... was : Matlab code request (Matt Flax )

Subject: Re: Octave code request ... was : Matlab code request
From:    Matt Flax  <flatmax(at)MATT.FLAX>
Date:    Tue, 28 Sep 2004 01:49:07 +1000

OK,

I see ... well we can write a function to help you to generate the noise
and then generate the tone ...

I guess you will do something like so in octave (GPL math script
language ... check www.octave.org)

I will assume that you want tone in notched out noise here ??? If not
let me know.... you will have to find someone to fill in the various
sections ... I am only creating a specification for you ... with some
hints ...

save the following to a file and run octave from that directory.

========== BEGIN toneInNotchedNoise.m =================

function signal=toneInNotchedNoise(noiseAmp, notchCF, notchBW, signalDuration, toneF, toneAmp, fs)
  %# toneInNotchedNoise is an octave function to generate arbitrary tone
  %# in Notched noise type signals for psychological experiments.
        %# input:
        %#        noiseAmp : level of the noise
        %#        notchCF  : centre frequency of the notch filter (Hz)
        %#        notchBW  : 3dB bandwidth of the notch
        %#        signalDuration : seconds
        %#        toneF    : Frequency of the tone (Hz)
        %#        toneAmp  : Amplitude of the tone
        %#        fs       : Sample freq. (Hz)
        %# output :
        %#        signal : tone in notched noise

        %# changelog
        %# v1 : Specification by flatmax under GPL license [1]

        %# Generate noise here
        signal=rand(1,duration*fs);

        %# Notch filter noise here ...
        %# i] gen filter
        [b,a]=butter....
        %# ii] filter noise
        signal=filter(b,a,signal);

        %# generate tone and sum to notched noise
        signal+=sin(....)

%#[1]
%# toneInNotchedNoise is an octave function to generate arbitrary tone
%# in Notched  noise type signals for psychological experiments.
%# Copyright (C) 2004  Auditory mail list

%#  This program is free software; you can redistribute it and/or
%#  modify it under the terms of the GNU General Public License
%#  as published by the Free Software Foundation; either version 2
%#  of the License, or (at your option) any later version.

%#  This program is distributed in the hope that it will be useful,
%#  but WITHOUT ANY WARRANTY; without even the implied warranty of
%#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
%#  GNU General Public License for more details.

%#  You should have received a copy of the GNU General Public License
%#  along with this program; if not, write to the Free Software
%#  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
%#  02111-1307, USA.
endfunction

=========== END toneInNotchedNoise.m ==============

On Mon, Sep 27, 2004 at 10:52:57AM -0400, Amanda Lauer wrote:
> I'm actually not sure exactly what I want to test my subjects on.  I
> need to write a program that generates loads of different noise/tone
> combinations at different signal-to-noise ratios.  Unfortunately, I am
> not very experienced with Matlab.
>
> Amanda Lauer
> Dept. of Psychology
> Center for the Comparative &
> Evolutionary Biology of Hearing
> University of Maryland
> College Park, MD 20783
> 301-405-5940
>
> >>> flatmax(at)Matt.Flax 9/27/2004 10:44:17 AM >>>
> Hi,
>
> I can generate such signals for you, however I require specifications.
>
> Matt
>
> On Mon, Sep 27, 2004 at 10:27:21AM -0400, Amanda Lauer wrote:
> > Does anyone have Matlab code for generating stimuli for measuring
> > psychophysical tuning curves and/or forward masking that I may have
> a
> > look at?  In particular, stimuli with a narrowband noise masker would
> be
> > useful.  Thanks in advance.
> >
> > Amanda Lauer
> > Dept. of Psychology
> > Center for the Comparative &
> > Evolutionary Biology of Hearing
> > University of Maryland
> > College Park, MD 20783
> > 301-405-5940
>
> > BEGIN:VCARD
> > VERSION:2.1
> > X-GWTYPE:USER
> > FN:Lauer, Amanda
> > TEL;WORK:0
> > ORG:;PSYC
> > TEL;PREF;FAX:314-9566
> > EMAIL;WORK;PREF;NGW:alauer(at)psyc.umd.edu
> > N:Lauer;Amanda
> > TITLE:Graduate Student
> > ADR;DOM;WORK;PARCEL;POSTAL:;0 Bio-Psyc
> > LABEL;DOM;WORK;PARCEL;POSTAL;ENCODING=QUOTED-PRINTABLE:Lauer,
> Amanda=0A=
> > 0 Bio-Psyc
> > END:VCARD
> >
>
>
> --
> http://www.flatmax.org
>
> WSOLA TimeScale Audio Mod  : http://mffmtimescale.sourceforge.net/
> FFTw C++                   : http://mffmfftwrapper.sourceforge.net/
> Vector Bass                : http://mffmvectorbass.sourceforge.net/
> Multimedia Time Code       : http://mffmtimecode.sourceforge.net/

> BEGIN:VCARD
> VERSION:2.1
> X-GWTYPE:USER
> FN:Lauer, Amanda
> TEL;WORK:0
> ORG:;PSYC
> TEL;PREF;FAX:314-9566
> EMAIL;WORK;PREF;NGW:alauer(at)psyc.umd.edu
> N:Lauer;Amanda
> TITLE:Graduate Student
> ADR;DOM;WORK;PARCEL;POSTAL:;0 Bio-Psyc
> LABEL;DOM;WORK;PARCEL;POSTAL;ENCODING=QUOTED-PRINTABLE:Lauer, Amanda=0A=
> 0 Bio-Psyc
> END:VCARD
>


--
http://www.flatmax.org

WSOLA TimeScale Audio Mod  : http://mffmtimescale.sourceforge.net/
FFTw C++                   : http://mffmfftwrapper.sourceforge.net/
Vector Bass                : http://mffmvectorbass.sourceforge.net/
Multimedia Time Code       : http://mffmtimecode.sourceforge.net/