file3-o.txt

Reference Implementation of G.711 standard and other voice codecs

#include <stdio.h>
#include <string.h>
#include "gpib-bib.h"
#include "gpib-dft.h"
#include "hp35665a.h"

void            main()
{
  /* Local variables */
  float           buf[500];
  long            datapoints, pulseno;
  int             bd, dev;	/* GPIB board and device numbers */

  /* Assign unique identifier to board 0 and store in variable bd */
  if ((bd = ibfind("GPIB0")) < 0)
    exit(GPIB_error("Can't initialize GPIB board\n"), 1);

  /* Initializing HP35665A as DEV11 */
  if ((dev = ibfind("DEV11")) < 0)
    exit(GPIB_error("Can't initialize HP35665A as DEV11\n"), 2);

  /* Send the Interface Clear (IFC). */
  if (ibsic(bd) & ERR)
    exit(GPIB_error("Failed sending IFC\n"), 1);

  /* Turn on Remote Enable (REN) signal so instrument can be programmed. */
  if (ibsre(bd, 1) & ERR)
    exit(GPIB_error("Failed raising REN\n"), 1);

  /* Initialize the HP35665A */
  if (init_HP35665A(bd))
    exit(2);

  /* Do multiple measurements, until a key is hit */
  do
  {
    /* Print message */
    printf("Dial something on the phone\r");

    /* Get channel 1 of HP35665A, when new data comes */
    if (get_trace_HP35665A(bd, buf, &datapoints, 1))
      break;

    /* Find out which key was pressed and print if a valid one */
    if (get_vote(buf, datapoints, 0l, 9l, &pulseno))
      printf("Pressed key %ld\t\t\t\n", pulseno);

  } while (!kbhit());

  /* Send instrument to local mode */
  ibloc(dev);

  /* The program terminates with an interface clear */
  ibsic(bd);
}