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<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>Hi,</span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'> </span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>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. </span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'> </span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>I am using the following parameters and structures</span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>160, /*frameSize*/</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> 40, /*subframeSize*/</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> 10, /*lpcSize*/</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> 17, /*pitchStart*/</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> 144, /*pitchEnd*/ </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>/* 11 kbps medium bit-rate mode */</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>static const SpeexSubmode nb_submode4 = {</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font><span lang=IT>-1,</span></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=IT
style='font-size:12.0pt'> 0,</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=IT
style='font-size:12.0pt'> 1,</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=IT
style='font-size:12.0pt'> 0,</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=IT
style='font-size:12.0pt'> /*LSP quantization*/</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=IT
style='font-size:12.0pt'> lsp_quant_lbr,</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=IT
style='font-size:12.0pt'> lsp_unquant_lbr,</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=IT
style='font-size:12.0pt'> </span>/*Pitch quantization*/</font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> pitch_search_3tap,</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> pitch_unquant_3tap,</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> &ltp_params_med,</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> /*Innovation quantization*/</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> split_cb_search_shape_sign,</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> split_cb_shape_sign_unquant,</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> &split_cb_nb_med,</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> QCONST16(.45,15),</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> 220</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>};</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>/* Parameters for Long-Term Prediction (LTP)*/</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>static const ltp_params ltp_params_lbr = {</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> gain_cdbk_lbr,</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> 5,</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> 7</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>};</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>/* Split-VQ innovation parameters narrowband */</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>static const split_cb_params split_cb_nb_med = {</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>
8,
/*subvect_size*/</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>
5,
/*nb_subvect*/</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> exc_8_128_table, /*shape_cb*/</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>
7,
/*shape_bits*/</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> 0,</span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'> </span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'> </span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'> </span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>I have three problems.</span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'> </span></font></p>
<ol style='margin-top:0in' start=1 type=1>
<li class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>My DSP has 24 bits register and memory with a 24 X 24
= 48 bit multiply and a 56 bit accumulator. I see scaling shifts when
using 32 bit registers. Can anyone tell me what scaling values like </span></font></li>
</ol>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'> </span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>#define LPC_SCALING 8192</span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>#define SIG_SCALING 16384</span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>#define LSP_SCALING 8192.</span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>#define GAMMA_SCALING 32768.</span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>#define GAIN_SCALING 64</span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>#define GAIN_SCALING_1 0.015625</span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'> </span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>#define LPC_SHIFT
13</span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>#define LSP_SHIFT
13</span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>#define SIG_SHIFT
14</span></font></p>
<p class=MsoNormal style='margin-left:1.0in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'> </span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'> Would
be required for a 24 bit register? </span></font></p>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'> </span></font></p>
<ol style='margin-top:0in' start=2 type=1>
<li class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>I would like to only include only the data tables as
required to support 11kbps narrowband mode. I think they would be the
following signed byte tables</span></font></li>
</ol>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>cdbk_nb[640]</span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>cdbk_nb_low1[320]</span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>cdbk_nb_high1[320]</span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>gain_cdbk_lbr[128]</span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>exc_8_128_table[1024]</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> Have
I missed any?</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'> </span></font></p>
<ol style='margin-top:0in' start=3 type=1>
<li class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>I would like to estimate the code space and duty cycle
requirements using fix point 11kbps narrowband decode. I think I have identified
most of the routines that use most of the duty cycle but I am not sure if
I have found them all. </span></font></li>
</ol>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in'><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>speex_bits_unpack_unsigned()</span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in'><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>peex_bits_unpack_signed()</span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in'><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>split_cb_shape_sign_unquant()</span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>pitch_unquant_3tap()</span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:.5in'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>lsp_unquant_lbr()</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> I
will be porting there routines to assembly and would like to know that I have a
chance of fitting them in the 2K I have free. </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> Is
there a minimal list of decode routines that are required?</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks for any help possible</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Russell Barr</span></font></p>
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