Sound DAQ Demo
Contents
Create analog output object
clear
ao = analogoutput('winsound',0);
disp(ao);
Display Summary of Analog Output (AO) Object Using 'SigmaTel Audio'.
Output Parameters: 8000 samples per second on each channel.
Trigger Parameters: 1 'Immediate' trigger on START.
Engine status: Waiting for START.
0 total sec. of data currently queued for START.
0 samples currently queued by PUTDATA.
0 samples sent to output device since START.
AO object contains no channels.
Show properties
fprintf('Sample Rate:\n');
disp(propinfo(ao,'SampleRate'));
addchannel(ao,1);
disp(ao.Channel);
Sample Rate:
Type: 'double'
Constraint: 'bounded'
ConstraintValue: [5000 96000]
DefaultValue: 8000
ReadOnly: 'whileRunning'
DeviceSpecific: 0
Index: ChannelName: HwChannel: OutputRange: UnitsRange: Units:
1 'Mono' 1 [-1 1] [-1 1] 'Volts'
Generate sounds
fs = 8000;
t = (0:4000)/fs;
freq = [220 440 880];
vol = [1 0.5 0.25];
for k=1:3;
data = vol(k)*sin(2*pi*freq(k)*t);
putdata(ao,data');
start(ao);
wait(ao,1);
end
close all open DAQ objects
for obj=daqfind
delete(obj);
end
clear ao obj