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Operating Systems OS X (Apple) Variable frequency audio generator... Post 302979739 by Corona688 on Thursday 18th of August 2016 11:31:11 AM
Old 08-18-2016
Interesting solution! I'm surprised it can tell the diff between 6000 and 6001 hz, most audio devices run at fixed frequencies and most players don't bother correcting. Using your much-beloved sox utility on a fixed-rate raw file might give you more reliable and portable control -- resample it to one rate and force it to output at another rate.

Something like:

Code:
printf "\x01\xff" > file0 # Square wave
printf "" > file1

# Double the number of wavelengths 2^8 i.e. 256 times
for N in 1 2 3 4 5 6 7 8
do
        cat file0 >> file1
        cat file1 >> file0
done

while true
do
        cat file0 file1
done | sox ...

rm -f file0 file1

 

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synaesthesia(1) 														   synaesthesia(1)

NAME
synaesthesia - visual sound display SYNOPSIS
synaesthesia [--use-sdl] [--use-x] [--use-svga] [--fullscreen] [--width w] [--height h] input DESCRIPTION
Synaestheia is a program for representing audio graphically in real time using an attractive variety of visual effects. It reads sound data from input and displays the visual representation through svgalib, X or SDL. While synaesthesia is running, moving the mouse over the window will expose a set of audio and other runtime controls. --use-sdl Force display via SDL. --use-svga Force display via svgalib (i386 architecture only). --use-x Force display via X. --fullscreen Attempt a full-screen display (requires a fast machine). --width w Specify a width for the window. --height h Specify a height for the window. input as cd | line | esd | pipe frequency Audio source; this should be one of cd, line, esd, or pipe. When using a pipe source, the sample frequency (e.g. 44100) must be specified; synaesthesia will expect a 16-bit stereo PCM stream on standard input. The sound will be played to the audio device. EXAMPLES
synaesthesia esd synaesthesia cd synaesthesia line ogg123 -d raw -f - song.ogg | synaesthesia pipe 44100 AUTHOR
Synaesthesia was written by Paul Harrison <pfh@csse.monash.edu.au>. This manual page was written by Devin Carraway <devin@debian.org> for the Debian GNU/Linux system (but may be used by others). 10 May 2003 synaesthesia(1)
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