search for: lpcsize

I would like to make lpcSize a multiple of 4. In the current library for narrow band mode lpcSize is currently set to 10. I would like to increase this 12 for optimization reasons. Is it a simple matter of just changing lpcSize in the structures in mode.c or are there other implications to doing this? I did try and change...

...process things in 4 element blocks. Is there a simpler approach you could recommend? Vasant Shridhar ________________________________________ From: Jean-Marc Valin [jmvalin at jmvalin.ca] Sent: Monday, April 11, 2011 5:29 PM To: Shridhar, Vasant Cc: speex-dev at xiph.org Subject: Re: [Speex-dev] lpcSize On 11-04-11 11:05 AM, Shridhar, Vasant wrote: > I would like to make lpcSize a multiple of 4. In the current library for > narrow band mode lpcSize is currently set to 10. I would like to > increase this 12 for optimization reasons. Is it a simple matter of just > changing lpcSize in t...

...= ((char*)st) + sizeof(EncState); #endif if (!st) return NULL; st->mode=m; st->frameSize = mode->frameSize; st->windowSize = st->frameSize*3/2; st->nbSubframes=mode->frameSize/mode->subframeSize; st->subframeSize=mode->subframeSize; st->lpcSize = mode->lpcSize; st->gamma1=mode->gamma1; st->gamma2=mode->gamma2; st->min_pitch=mode->pitchStart; st->max_pitch=mode->pitchEnd; st->lag_factor=mode->lag_factor; st->lpc_floor = mode->lpc_floor; st->submodes=mode->submodes; st-&g...

...zeros in the functions you're trying to optimize. Jean-Marc > Vasant Shridhar ________________________________________ From: > Jean-Marc Valin [jmvalin at jmvalin.ca] Sent: Monday, April 11, 2011 > 5:29 PM To: Shridhar, Vasant Cc: speex-dev at xiph.org Subject: Re: > [Speex-dev] lpcSize > > On 11-04-11 11:05 AM, Shridhar, Vasant wrote: >> I would like to make lpcSize a multiple of 4. In the current >> library for narrow band mode lpcSize is currently set to 10. I >> would like to increase this 12 for optimization reasons. Is it a >> simple matter of j...

Hi, So I got a crash on the following code: k1=SUBMODE(lpc_enh_k1); k2=SUBMODE(lpc_enh_k2); which in the newer codebase is: bw_lpc(SUBMODE(lpc_enh_k1), st->interp_qlpc, awk1, st->lpcSize); bw_lpc(SUBMODE(lpc_enh_k2), st->interp_qlpc, awk2, st->lpcSize); I am not sure if the newer code will have the same issue but the following check is performed in nb_decode_lost, so I figure the same thing should be done in decode... right? add (or equivalent): if (st-&...

...e)+4000*sizeof(spx_sig_t)); /* snip */ } I tried to reduce the stacksize from 8000/4000 to say 2000/1000, and reduce buffer size to 160 bytes: src/modes.c: /* Default mode for narrowband */ static const SpeexNBMode nb_mode = { 160, /*frameSize*/ 40, /*subframeSize*/ 10, /*lpcSize*/ 640, /*bufSize*/ <--------- reduce to 160 this does not work, there are various crashes in strange places which looks like its caused by stack overflow or data corruption. question is; are there any clean way of reducing memory usage? the stack at the end of the state objec...

...ine a new constant lag_factor_gauss that is manually set equal to exp(sqr(2*M_PI*lag_factor)/-2) by whoever changes the lag_factor. From bash you can say echo 'e((8*a(1)*.012)^2/-2)' |bc -l Then we can replace the code in the init functions with : gauss = 16384; for (i=0;i<st->lpcSize+1;i++) { st->lagWindow[i]=gauss; for (j=i*i; j < (i+1)*(i+1); j++) { gauss = MULT16_16_Q15 (gauss, st->lag_factor_gauss); } } A Taylor expansion will be more accurate.

Hi, can someone help me understand and experiment with Speex in a better way than my knowledge. I want to change the LPC filter order of the Speex algorithm. I think I need to change the LPC order( or lpcSize) in modes.c file. but to make it work I need to modify the codebook also, can someone tell me how to go about changing the codebook entries to support the changed order of prediction. Please help me on this asap bye devilal --------------------------------- Relax. Yahoo! Mail virus scanni...

...=============================================== 1. modes.c - nb_mode_new() SpeexNBMode * nb_mode; nb_mode = (SpeexNBMode *) speex_alloc (sizeof (SpeexNBMode)); if (nb_mode == NULL) return NULL; nb_mode->frameSize = frameSize; nb_mode->subframeSize = subframeSize; nb_mode->lpcSize = lpcSize; nb_mode->bufSize = bufSize; <<<--- 1>d:\voip\mod_speexrefcode\modes_noglobals.c(198) : error C2039: 'bufSize' : is not a member of 'SpeexNBMode' 2. mdf.c - speex_echo_cancel() /* Update weight to prevent circular convolution (MDF / AUMDF) */...

...=============================================== 1. modes.c - nb_mode_new() SpeexNBMode * nb_mode; nb_mode = (SpeexNBMode *) speex_alloc (sizeof (SpeexNBMode)); if (nb_mode == NULL) return NULL; nb_mode->frameSize = frameSize; nb_mode->subframeSize = subframeSize; nb_mode->lpcSize = lpcSize; nb_mode->bufSize = bufSize; <<<--- 1>d:\voip\mod_speexrefcode\modes_noglobals.c(198) : error C2039: 'bufSize' : is not a member of 'SpeexNBMode' 2. mdf.c - speex_echo_cancel() /* Update weight to prevent circular convolution (MDF / AUMDF) */...

...I am using speex 1.2beta2 on a 24bit DSP that has a severe program and data space limitations. I am only interested in the speex decoder for 11kbps narrowband implementation. I am using the following parameters and structures 160, /*frameSize*/ 40, /*subframeSize*/ 10, /*lpcSize*/ 17, /*pitchStart*/ 144, /*pitchEnd*/ /* 11 kbps medium bit-rate mode */ static const SpeexSubmode nb_submode4 = { -1, 0, 1, 0, /*LSP quantization*/ lsp_quant_lbr, lsp_unquant_lbr, /*Pitch quantization*/ pitch_search_3tap, pitch_unquant_3t...

...ed to reduce the stacksize from 8000/4000 to say 2000/1000, > and reduce buffer size to 160 bytes: > > > src/modes.c: > > /* Default mode for narrowband */ > static const SpeexNBMode nb_mode = { > 160, /*frameSize*/ > 40, /*subframeSize*/ > 10, /*lpcSize*/ > 640, /*bufSize*/ <--------- reduce to 160 > > > this does not work, there are various crashes in strange places which > looks like its caused by stack overflow or data corruption. > > question is; are there any clean way of reducing memory usage? >...

...nd > data space limitations. I am only interested in the speex decoder for > 11kbps narrowband implementation. > > > > I am using the following parameters and structures > > > > 160, /*frameSize*/ > > 40, /*subframeSize*/ > > 10, /*lpcSize*/ > > 17, /*pitchStart*/ > > 144, /*pitchEnd*/ > > > > /* 11 kbps medium bit-rate mode */ > > static const SpeexSubmode nb_submode4 = { > > -1, > > 0, > > 1, > > 0, > > /*LSP quantization*/ > >...