hi we are trying to decode speech that was encoded on a ds'pic with a NB 8 Kb/sec. we wrote a simple program using the API speex lib 1.2 beta 3: #include "stdafx.h" #include <iostream> #include <stdio.h> #include "speex.h" #include "speex_bits.h" using namespace std; char hex2ascii(char toconv); #define FRAME_SIZE 160 #define nbBytes 20 int main(int argc, _TCHAR* argv[]) { int mode = 3; int i=0,j=0; char ch=0; int in=0,temp=0; char out_ascii[640]={0}; float output[FRAME_SIZE];//the originals 160 words in float short out[FRAME_SIZE];//the originals 160 words char cbits[nbBytes]; void *state;//hold the state of the decoder SpeexMode speex_nb_mode; SpeexBits bits; state=decoder_init_func(& speex_nb_mode);//initializing a speex decoder speex_decoder_ctl(state,SPEEX_SET_MODE,&temp); speex_bits_init(&bits); we get the data throw RS232, and convert the decoded (supose to be the original or close to it) to ASCII, so we can simply play it in MATLAB: system("mode com1: baud=38400 parity=n data=8 stop=1");//opening the rs232 FILE* mic=fopen("com1:", "w+" ); FILE *mic1 = fopen("mic.txt" , "wt"); while(1) { if (feof( mic ) == 0){ cbits[i]=fgetc(mic); if(i==20) { speex_bits_read_from(&bits, cbits, nbBytes); i=0; speex_decode(state, &bits, output); for (j=0;j<FRAME_SIZE;j++) { out[j]=output[j]; out_ascii[j*4]=hex2ascii((out[j] >> 12) & 0x000F); out_ascii[j*4+1]=hex2ascii((out[j] >> 8) & 0x000F); out_ascii[j*4+2]=hex2ascii((out[j] >> 4) & 0x000F); out_ascii[j*4+3]=hex2ascii(out[j] & 0x000F); } fputs(out_ascii,mic1); } else{ i++; } } fclose( mic ); fclose( mic1 ); return 0; } char hex2ascii(char toconv) { if (toconv<0x0A) { toconv += 0x30; } else { toconv += 0x37; } return (toconv); } the program give as an error message: "*Unhandled exception at 0x1000b65a in new_speex.exe: 0xC0000005: Access violation reading location 0xccccccfc.*" we dont undersand why, maybe we are not on the correct NB mode? we need help! thanks shlomo and eitan EE students in israel -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.xiph.org/pipermail/speex-dev/attachments/20100906/7cd8d61e/attachment-0001.htm