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Full Discussion: A Function To Create A 1 Second Sinewave WAVE Beep File In Python.
Top Forums Programming A Function To Create A 1 Second Sinewave WAVE Beep File In Python. Post 302930838 by DGPickett on Wednesday 7th of January 2015 04:29:09 PM
Old 01-07-2015
Reminds me of an early C project I wrote myself 21 yrs. ago, which does a pure 440 hz sine wave with one byte samples and low sample rate:

Code:
 
a440.c
======
 
#include <stdio.h>
#ifdef BORLAND
#include <stdlib.h>
#endif
#include <math.h>
char hdr[]={'R', 'I', 'F', 'F', 0, 0, 0, 0, 'W', 'A', 'V', 'E', 'f', 'm', 't', 32, 16, 0, 0, 0, 1, 0, 1, 0, 17, '+', 0, 0, 17, '+', 0, 0, 1, 0, 8, 0, 'd', 'a', 't', 'a', 0, 0, 0, 0};
FILE * f ;
main(argc,argv)
int argc;
char**argv;
{
  #define SAMPLES 600L
  #define FREQ 440
  #define SPS 11025
  #define PI 3.1415927
  long i ;
  float w, x ;
  if ( argc < 2 )
  {
    fprintf( stderr, "Usage is '%s filename'\n", argv[0] ) ;
    exit( -1 ) ;
  }
  if ( !( f = fopen( argv[1], "wb" ) ) )
  {
    fprintf( stderr, "Can't open '%s' to write\n", argv[1] ) ;
    exit( -2 ) ;
  }
  w = 2 * PI * FREQ / SPS ;
  i = SAMPLES + 36 ;
  hdr[4] = i % 256 ;
  hdr[5] = ( i / 256 ) % 256 ;
  hdr[6] = ( i / 65536L ) % 256 ;
  hdr[7] = i / 16777216L ;
  i = SAMPLES ;
  hdr[40] = i % 256 ;
  hdr[41] = ( i / 256 ) % 256 ;
  hdr[42] = ( i / 65536L ) % 256 ;
  hdr[43] = i / 16777216L ;
  for( i = 0L ; i < sizeof(hdr) ; i++ )
  {
    putc( hdr[i], f ) ;
  }
  i = 0 ;
  while ( ++i <= SAMPLES )
  {
    putc( (char)( 128.0 + 127.999 * sin( w * i ) ), f ) ;
  }
  fclose( f ) ;
  exit( 0 ) ;
}

Last edited by DGPickett; 01-07-2015 at 05:46 PM..
This User Gave Thanks to DGPickett For This Post:
wisecracker
 

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LEARN ABOUT CENTOS

fieldcomb

FIELDCOMB(1)						      General Commands Manual						      FIELDCOMB(1)

NAME

       fieldcomb - combine two or more field frames for video animation

SYNOPSIS

       fieldcomb [ -e|-o ][ -r ] [ -f combined.hdr ] field0.hdr field1.hdr ..

DESCRIPTION

       Fieldcomb  combines two or more field frames into half as many final video frames for field-based animations.  Normally, the even scanlines
       in the output are given over to the first, third, fifth, etc. pictures given on the input, and the odd scanlines are given over to the sec-
       ond,  fourth,  sixth,  etc.  pictures  on the input.  This behavior corresponds to the -e option, which is set by default.  To reverse this
       ordering, the -o option must be specified.

       Normally, fieldcomb will name output frames by dividing the numbers on the input field file names by 2, inserting a 'C'	right  before  the
       number, adding leading zeroes to make it always four digits.  For example, the command:

	 fieldcomb anim12.hdr anim13.hdr anim14.hdr anim15.hdr

       will produce two output pictures:

	 animC0006.hdr & animC0007.hdr

       If  an odd number of input files is given on the command line, the last file is held over and used as the first file in the next invocation
       of fieldcomb in the same directory.  In this way, the program works well with the "TRANSFER" facility of ranimate(1), which does not  guar-
       antee an even number of frames will be passed every time.

       If only two input files are given, the -f option may be used to specify a different output name of the user's choosing.

       If the -r option is specified, then the input files will be removed once they have been combined.

AUTHOR

       Greg Ward

ACKNOWLEDGEMENT

       Work on this program was sponsored by Iebele Abel.

SEE ALSO

       getinfo(1), pcomb(1), pfilt(1), phisto(1), ran2tiff(1), ranimate(1), rpict(1)

RADIANCE
							     9/6/2005							      FIELDCOMB(1)
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