[linux-audio-user] Digital audio files for hardware verification

[Markus Schwarzenberg]

On Mon, 24 Oct 2005 11:22:36 -0700 Mark Knecht <markknecht at gmail.com>
wrote:

 
> 2) Assume I've chosen a sample rate and bit-depth. Now want to
> generate a hex file with sine wave data, again with each sample
> written to its own line. Any easy way to do it?

awk is your friend (at least, mine ;-), put the following command
in a single line:

gawk -vt=1 -vf=2 -vr=220 -vd=6 'BEGIN{z=lshift(1,d-1);w=(d-1)/4+1;for(i=0;i<=r*t;i++)printf("0x%0*x\n",w,z+0.5+(z-1)*sin((f/r)*i*2*3.1415926));exit}' > outfile.dat

Arguments (-vVARIABLE=...)
VARIABLEs: t ... total time to generate/seconds
           f ... frequency/Hz
           r ... sample rate/Hz
           d ... depth/bit

Output has an offset of 1<<(depth - 1).

--
Markus Schwarzenberg