Play low sampling frequency audio in matlab

I have a 6467584*1 double array containing audio data. The sampling frequency for the data is 256. When I try to play the audio using the soundsc function it shows the following error :

    % Error using sound (line 76) Device Error: Invalid sample rate. Error in soundsc (line 55)
sound(varargin{:});

Is there any function that I can use in MATLAB to play audio?

Answer 1

[Walter Roberson]

The difficulty appears to originate in the portaudio layer; although sound() itself permits as low as 80 Hz, portaudio is not able to open something that low. Exactly what it can handle might depend upon your OS and hardware.

I am running a scan now to see what the lowest rate is that my system can handle. It may take a while.

foo = rand(1,1000);
for r = 80:8000; try sound(foo,r); fprintf('\nOk at %d!\n', r); break; catch ME; if mod(r,100)==0; fprintf('%d...', r); end; end; end

It is past 800 now; I will update when it stops.

... 1000 was the lowest accepted on my system.

You may need to resample your 256 to 1024 to play it.