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Full Discussion: A Bash Audio Sweep Generator...
Operating Systems OS X (Apple) A Bash Audio Sweep Generator... Post 302912511 by wisecracker on Friday 8th of August 2014 04:43:29 PM
Old 08-08-2014
Hi all...

This building block generates a RAW sinewave and will be the basis of a sinewave sweep generator.

This is also proof of concept and is issued as Public Domain. The final draft will have pseudo-variable bit rates for varying frequency ranges. This is the default mode, 8 bit depth, mono, 8000Hz sampling rate.

Enjoy finding simple solutions to often very difficult questions...

Bazza.
Code:
#!/bin/bash
# calcsine.sh
clear
> /tmp/sinefloat
> /tmp/sine.raw
> /tmp/ascii
angle=0
step=45
text=""
line=""
# Create an 8 plot floating point sinewave table, I couldn't get "scale=0" to work correctly.
while [ $angle -le 359 ]
do
	bc -l <<< "{sin=((s($angle*6.2832/360)*47)+79); print sin,\"\\n\"}" >> /tmp/sinefloat
	#angle=$[ ( $angle + $step ) ]
	angle=$((angle+step))
done
cat < /tmp/sinefloat
echo ""
# Import each flaoting point line, create an integer value, convert to ASCII and save.
while read line
do
	printf "${line/.*}\n"
	#printf \\`printf '%03o' ${line/.*}` >> /tmp/ascii
	printf \\$(printf '%03o' ${line/.*}) >> /tmp/ascii
done < /tmp/sinefloat
# Now generate a 65536 byte RAW sinewave file using ASCII only.
read text < /tmp/ascii
echo ""
echo "Sinewave text string: $text"
for n in {1..13}
do
	text=$text$text
done
printf "$text" > /tmp/sine.raw
# For /dev/dsp users.
# cat < /tmp/sine.raw > /dev/dsp
# For SOX users, note this my SOX path you will have to edit your own...
/Users/barrywalker/Downloads/sox-14.4.0/play -v 1 -r 8000 -b 8 -c 1 -e unsigned-integer /tmp/sine.raw

Results of this demo, note the "clear" command has been edited out:-
Code:
Last login: Fri Aug  8 21:28:59 on ttys000
AMIGA:barrywalker~> ./calcsine.sh
79.00000000000000000000
112.23407975339525893445
125.99999999968292776011
112.23383560221254681395
78.99965471872028531385
45.76567609721566368521
32.00000000285365015760
45.76640855076378687120

79
112
125
112
78
45
32
45

Sinewave text string: Op}pN- -

/tmp/sine.raw:

 File Size: 65.5k     Bit Rate: 64.0k
  Encoding: Unsigned PCM  
  Channels: 1 @ 8-bit    
Samplerate: 8000Hz       
Replaygain: off         
  Duration: 00:00:08.19  

In:100%  00:00:08.19 [00:00:00.00] Out:361k  [======|======] Hd:2.4 Clip:0    
Done.
AMIGA:barrywalker~> _

 

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LEARN ABOUT DEBIAN

glsweep

GLSWEEP(1)						      General Commands Manual							GLSWEEP(1)

NAME

       glsweep - a program generating log sweep and inverse filter.

SYNOPSIS

       glsweep [parameters] sweepfile inversefile

       Usage: glsweep rate amplitude hzstart hzend duration silence leadin leadout sweepfile inversefile

       Example: glsweep 44100 0.5 10 21000 45 2 0.05 0.005 sweep.pcm inverse.pcm

DESCRIPTION

       This manual page documents briefly the glsweep program.	This manual page was written for the Debian distribution because the original pro-
       gram does not have a manual page.

       glsweep is program to perform accurate time aligned impulse response measurements.

       glsweep is based on the log sweep method for impulse response measurement, which is one of the most accurate, especially for acoustic  mea-
       surements. This method is based on a special signal, which is a logarithmic sinusoidal sweep, that need to be reproduced through the system
       under test, and an inverse filter, which, when convolved with the measured log sweep, gives back the impulse response of the system.

       The output format is the usual raw file with 32 bit IEEE floating point samples. If you need to convert the sweep generated using the exam-
       ple above to a 16 bit mono WAV file you can use SoX with a command line like this one:

       sox -t f32 -r 44100 -c 1 sweep.pcm -t wav -c 1 sweep.wav

PARAMETERS

       rate:	    reference sample rate
       amplitude:   sweep amplitude
       hzstart:     sweep start frequency
       hzend:	    sweep end frequency
       duration:    sweep duration in seconds
       silence:     leading and trailing silence duration in seconds
       leadin:	    leading window length as a fraction of duration
       leadout:     trailing window length as a fraction of duration
       sweepfile:   sweep file name
       inversefile: inverse sweep file name

       Refer to html documentation for more details.

SEE ALSO

       sox(1).

AUTHOR

       This manual page was written by Jaromir Mike <mira.mikes@seznam.cz>, for the Debian project (but may be used by others).

								  August 30, 2011							GLSWEEP(1)
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