How to generate and play audio in real time with dsp toolbox
5 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Hi everybody,
I am writing an application which must simultaneously analyse video frames and generate & play an audio stream. I am trying to use a dsp.AudioPlayer object to do this but I'm having lag issues. Without code writing to the dsp.AudioPlayer object I'm achieving 30-40 fps, with audio output I get less than 1. After profiling I can see most of the time is going into a for loop which pushes samples from a buffer to the audio object with the step function.
obj.hap = dsp.AudioPlayer;
sc_samples = 0:(1/obj.sc_sample_rate):path.tof; % Time samples
sc_voltage = interp1(path.pixelt, real(path.direct), sc_samples, 'linear');
% Sound wave stored in sc_voltage, with time base sc_samples
% sample rate is 8000hz
tic
for samp = 1:length(sc_samples)
step(obj.hap, sc_voltage(samp));
end
time = toc
Is there any way to copy the whole buffer at once? Would this boost performance? I am aware of sound outputs in the data acquisition toolbox but this isn't compatible with 64 bit versions of Matlab.
Thanks for your help
0 Kommentare
Antworten (2)
yeshwanth manhcuri
am 21 Mai 2013
try with wavread and wavwrite functions....audio player will show some time lag/..............
0 Kommentare
Siehe auch
Kategorien
Mehr zu Code Generation and Deployment finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!