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function Beeper(frequency, fVolume, durationSec);
% function Beeper(frequency, [fVolume], [durationSec]);
%
% Play a beep sound. Default is 400 Hz for .15 sec.
% frequency can be a number, or else the string 'high', 'med', or 'low'.
%
% fVolume - normalized to range of 0 - 1. Default is 0.4;
% Warning: 1 is the maximum volume and is often very loud!
%
% NOTE: Beeper() uses Snd() internally. If you want to use Beeper() - and therefore
% Snd() in parallel with PsychPortAudio, read the notes in "help Snd" about pahandle
% sharing, especially about Snd('Open', pahandle, 1)!
%
% Funny name is because Matlab 6 contains a built-in function called "beep".
%
% 2006-02-15 - cburns
% - Added fVolume param
% - Swapped parameter order
%
% 2006-02-02 - cburns
% - Scaled down the volume of the sound to match the system volume better. It was at maximum volume.
% Would scare you enough to rip the bite bar off it's mount!
% And switched to using the sound() function, instead of the soundsc() function
% which, by default, maximizes the volume.
% - Update, using the PsychToolbox Snd function which should return immediately.
% Were experiencing delays with sound function
%
% 12/2/00 Backus - original version
persistent onetimedone;
if ~exist('frequency', 'var') || isempty(frequency)
frequency = 400;
end
if ~exist('durationSec', 'var') || isempty(durationSec)
durationSec = 0.15;
end
if ~exist('fVolume', 'var') || isempty(fVolume)
fVolume = 0.4;
else
% Clamp if necessary
if fVolume > 1.0
fVolume = 1.0;
elseif fVolume < 0
fVolume = 0;
end
end
if ischar(frequency)
if strcmp(lower(frequency), 'high') frequency = 1000;
elseif strcmp(lower(frequency), 'med') frequency = 400;
elseif strcmp(lower(frequency), 'medium') frequency = 400;
elseif strcmp(lower(frequency), 'low') frequency = 220;
end
end
% Silence any console output of Snd():
if isempty(onetimedone)
onetimedone = 1;
oldverbo = Snd('Verbosity', 1);
else
oldverbo = Snd('Verbosity', 0);
end
sampleRate = Snd('DefaultRate');
nSample = sampleRate*durationSec;
soundVec = sin(2*pi*frequency*(0:nSample-1)/sampleRate);
% Scale down the volume
soundVec = soundVec * fVolume;
try % this part sometimes crashes for unknown reasons. If it happens replace sound with normal beep:
% Play:
Snd('Play', soundVec, sampleRate);
% Wait for playback done:
Snd('Wait');
% Close sound driver again:
Snd('Close');
% Restore old verbosity:
Snd('Verbosity', oldverbo);
catch
% Restore old verbosity:
Snd('Verbosity', oldverbo);
% Primitive beep() fallback:
beep
end
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