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Full Discussion: Plotting A Sine Curve Inside A Bash Shell...
Operating Systems OS X (Apple) Plotting A Sine Curve Inside A Bash Shell... Post 302914577 by Corona688 on Tuesday 26th of August 2014 06:14:48 PM
Old 08-26-2014
I was trying to output direct 8-bit binary in awk. It kept converting my ff's into two-byte sequences.

You can, in GNU awk, with -b, which I was missing before:

Code:
$ # F is frequency, R is samplerate, S is number of samples
$ awk -b -v F=4000 -v R=8000 -v S=20 'BEGIN { for(N=0; N<S; N++) printf("%c", int(255*(sin(3.14159/2+2*3.14159*N*(F/R))/2)+128)) }' /dev/null | hexdump -C

00000000  ff 00 ff 00 ff 00 ff 00  ff 00 ff 00 ff 00 ff 00  |................|
00000010  ff 00 ff 00                                       |....|
00000014

$

Ordinary awk should be able to manage 1-127 with %c, but no more.
Last edited by Corona688; 08-26-2014 at 07:22 PM..
 

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LEARN ABOUT DEBIAN

lsconv

LSCONV(1)						      General Commands Manual							 LSCONV(1)

NAME

       lsconv - a program does Log Sweep convolution.

SYNOPSIS

       lsconv [parameters] sweepfile inversefile

       Usage: lsconv sweepfile inversefile outfile [refsweep mingain [dlstart]]

       Example: lsconv sweep.pcm inverse.pcm impulse.pcm refchannel.pcm 0.1 0.8

DESCRIPTION

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

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

       lsconv 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.

       Files used by lsconv must be in the raw 32 bit floating point format. Use for e.g. sox program for converting if needed.

PARAMETERS

       sweepfile:   sweep file name
       inversefile: inverse sweep file name
       outfile:     output impulse response file
       refsweep:    reference channel sweep file name
       mingain:     min gain for reference channel inversion
       dlstart:     dip limiting start for reference channel inversion

       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							 LSCONV(1)
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