Re: [MP3 ENCODER] Table SNR_s bug

Mark Taylor Wed, 27 Oct 1999 07:48:19 -0700
...
> 
> 
> In the psy model, we use SNR_s with the formula
> nb[b] = ecb[b] * norm_s[b] * exp( (double) SNR_s[b] * LN_TO_LOG10 );
> 
> You can easily notice that
>  exp(-8,240 * LN_TO_LOG10) = 0.15
>  exp(-7,447 * LN_TO_LOG10) = 0.18
> �
> 
> It seems that the exponential calculation is already included in the SNR_s
> table for MPEG-2,
> but not for MPEG-1.
> 
> Lionel
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The table of SNR_s for all the frequencies( deduced from psydata) is :

static double TableSNRShort [] =3D
{
 0.150000006 , 0.150000006 , 0.150000006 , 0.150000006 , 0.150000006 , // F=
r
equency =3D 16000.
 0.150000006 , 0.150000006 , 0.150000006 , 0.150000006 , 0.150000006 ,
 0.150000006 , 0.150000006 , 0.150000006 , 0.150000006 , 0.150000006 ,
 0.150000006 , 0.150000006 , 0.180000007 , 0.180000007 , 0.180000007 ,
 0.180000007 , 0.180000007 , 0.180000007 , 0.180000007 , 0.180000007 ,
 0.180000007 , 0.180000007 , 0.180000007 , 0.200000003 , 0.200000003 ,
 0.200000003 , 0.200000003 , 0.200000003 , 0.200000003 , 0.200000003 ,
 0.200000003 , 0.200000003 , 0.200000003 , 0.200000003 , 0.200000003 ,
 0.200000003 , 0.25     , 0.25     , 0.25     , 0.280000001 ,
 0.280000001 ,

 0.150000006 , 0.150000006 , 0.150000006 , 0.150000006 , 0.150000006 , // F=
r
equency =3D 22050.
 0.150000006 , 0.150000006 , 0.150000006 , 0.150000006 , 0.150000006 ,
 0.150000006 , 0.150000006 , 0.150000006 , 0.180000007 , 0.180000007 ,
 0.180000007 , 0.180000007 , 0.180000007 , 0.180000007 , 0.180000007 ,
 0.180000007 , 0.180000007 , 0.180000007 , 0.200000003 , 0.200000003 ,
 0.200000003 , 0.200000003 , 0.200000003 , 0.200000003 , 0.200000003 ,
 0.200000003 , 0.200000003 , 0.200000003 , 0.200000003 , 0.200000003 ,
 0.25     , 0.25     , 0.25     , 0.280000001 , 0.280000001 ,
 0.280000001 , 0.300000012 , 0.300000012 , 0.300000012 , 0.400000006 ,

 0.150000006 , 0.150000006 , 0.150000006 , 0.150000006 , 0.150000006 , // F=
r
equency =3D 24000.
 0.150000006 , 0.150000006 , 0.150000006 , 0.150000006 , 0.150000006 ,
 0.150000006 , 0.150000006 , 0.180000007 , 0.180000007 , 0.180000007 ,
 0.180000007 , 0.180000007 , 0.180000007 , 0.180000007 , 0.180000007 ,
 0.180000007 , 0.180000007 , 0.200000003 , 0.200000003 , 0.200000003 ,
 0.200000003 , 0.200000003 , 0.200000003 , 0.200000003 , 0.200000003 ,
 0.200000003 , 0.200000003 , 0.200000003 , 0.200000003 , 0.25     ,
 0.25     , 0.25     , 0.280000001 , 0.280000001 , 0.300000012 ,
 0.300000012 , 0.300000012 , 0.400000006 , 0.400000006 , 0.400000006 ,

 -8.240 , -8.240 , -8.240 , -8.240 , -8.240 , -8.240 , -8.240 , -8.240 ,  /=
/
 Frequency =3D 32000.
 -8.240 , -8.240 , -7.447 , -7.447 , -7.447 , -7.447 , -7.447 , -7.447 ,
 -7.447 , -7.447 , -7.447 , -7.447 , -6.990 , -6.990 , -6.990 , -6.990 ,
 -6.990 , -6.990 , -6.990 , -6.990 , -6.990 , -6.990 , -6.020 , -6.020 ,
 -6.020 , -6.020 , -5.229 , -5.229 , -5.229 , -5.229 , -4.559 , -4.559 ,
 -3.980 , -3.980 ,

 -8.240 , -8.240 , -8.240 , -8.240 , -8.240 , -8.240 , -8.240 , -8.240 ,  /=
/
 Frequency =3D 44100.
 -8.240 , -8.240 , -7.447 , -7.447 , -7.447 , -7.447 , -7.447 , -7.447 ,
 -7.447 , -7.447 , -7.447 , -7.447 , -6.990 , -6.990 , -6.990 , -6.990 ,
 -6.990 , -6.990 , -6.990 , -6.990 , -6.990 , -6.990 , -6.020 , -6.020 ,
 -6.020 , -6.020 , -5.229 , -5.229 , -5.229 , -5.229 , -4.559 ,

 -8.240 , -8.240 , -8.240 , -8.240 , -8.240 , -8.240 , -8.240 , -8.240 ,  /=
/
 Frequency =3D 48000.
 -8.240 , -8.240 , -7.447 , -7.447 , -7.447 , -7.447 , -7.447 , -7.447 ,
 -7.447 , -7.447 , -7.447 , -7.447 , -6.990 , -6.990 , -6.990 , -6.990 ,
 -6.990 , -6.990 , -6.990 , -6.990 , -6.990 , -6.990 , -6.020 , -6.020 ,
 -6.020 , -6.020 , -5.229 , -5.229 , -5.229 , -5.229
};


In the psy model, we use SNR_s with the formula
nb[b] =3D ecb[b] * norm_s[b] * exp( (double) SNR_s[b] * LN_TO_LOG10 );

You can easily notice that
 exp(-8,240 * LN_TO_LOG10) =3D 0.15
 exp(-7,447 * LN_TO_LOG10) =3D 0.18
=8A

It seems that the exponential calculation is already included in the SNR_s
table for MPEG-2,
but not for MPEG-1.

Lionel

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<HTML>
<HEAD>
<TITLE>Table SNR_s bug</TITLE>
</HEAD>
<BODY BGCOLOR=3D"#FFFFFF">
<TT>The table of SNR_s for all the frequencies( deduced from psydata) is :<=
BR>
<BR>
static double TableSNRShort [] =3D<BR>
{<BR>
&nbsp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,&nb=
sp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,&nbsp;//&nbsp;Frequency =3D 16000=
.<BR>
&nbsp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,&nb=
sp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,<BR>
&nbsp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,&nb=
sp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,<BR>
&nbsp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,&nbsp;0.180000007&nbsp;,&nb=
sp;0.180000007&nbsp;,&nbsp;0.180000007&nbsp;,<BR>
&nbsp;0.180000007&nbsp;,&nbsp;0.180000007&nbsp;,&nbsp;0.180000007&nbsp;,&nb=
sp;0.180000007&nbsp;,&nbsp;0.180000007&nbsp;,<BR>
&nbsp;0.180000007&nbsp;,&nbsp;0.180000007&nbsp;,&nbsp;0.180000007&nbsp;,&nb=
sp;0.200000003&nbsp;,&nbsp;0.200000003&nbsp;,<BR>
&nbsp;0.200000003&nbsp;,&nbsp;0.200000003&nbsp;,&nbsp;0.200000003&nbsp;,&nb=
sp;0.200000003&nbsp;,&nbsp;0.200000003&nbsp;,<BR>
&nbsp;0.200000003&nbsp;,&nbsp;0.200000003&nbsp;,&nbsp;0.200000003&nbsp;,&nb=
sp;0.200000003&nbsp;,&nbsp;0.200000003&nbsp;,<BR>
&nbsp;0.200000003&nbsp;,&nbsp;0.25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;,&nbsp;0.25=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;,&nbsp;0.25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;,&nbs=
p;0.280000001&nbsp;,<BR>
&nbsp;0.280000001&nbsp;,<BR>
<BR>
&nbsp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,&nb=
sp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,&nbsp;//&nbsp;Frequency =3D 22050=
.<BR>
&nbsp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,&nb=
sp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,<BR>
&nbsp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,&nb=
sp;0.180000007&nbsp;,&nbsp;0.180000007&nbsp;,<BR>
&nbsp;0.180000007&nbsp;,&nbsp;0.180000007&nbsp;,&nbsp;0.180000007&nbsp;,&nb=
sp;0.180000007&nbsp;,&nbsp;0.180000007&nbsp;,<BR>
&nbsp;0.180000007&nbsp;,&nbsp;0.180000007&nbsp;,&nbsp;0.180000007&nbsp;,&nb=
sp;0.200000003&nbsp;,&nbsp;0.200000003&nbsp;,<BR>
&nbsp;0.200000003&nbsp;,&nbsp;0.200000003&nbsp;,&nbsp;0.200000003&nbsp;,&nb=
sp;0.200000003&nbsp;,&nbsp;0.200000003&nbsp;,<BR>
&nbsp;0.200000003&nbsp;,&nbsp;0.200000003&nbsp;,&nbsp;0.200000003&nbsp;,&nb=
sp;0.200000003&nbsp;,&nbsp;0.200000003&nbsp;,<BR>
&nbsp;0.25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;,&nbsp;0.25&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;,&nbsp;0.25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;,&nbsp;0.280000001&nbsp;,&nbs=
p;0.280000001&nbsp;,<BR>
&nbsp;0.280000001&nbsp;,&nbsp;0.300000012&nbsp;,&nbsp;0.300000012&nbsp;,&nb=
sp;0.300000012&nbsp;,&nbsp;0.400000006&nbsp;,<BR>
<BR>
&nbsp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,&nb=
sp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,&nbsp;//&nbsp;Frequency =3D 24000=
.<BR>
&nbsp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,&nb=
sp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,<BR>
&nbsp;0.150000006&nbsp;,&nbsp;0.150000006&nbsp;,&nbsp;0.180000007&nbsp;,&nb=
sp;0.180000007&nbsp;,&nbsp;0.180000007&nbsp;,<BR>
&nbsp;0.180000007&nbsp;,&nbsp;0.180000007&nbsp;,&nbsp;0.180000007&nbsp;,&nb=
sp;0.180000007&nbsp;,&nbsp;0.180000007&nbsp;,<BR>
&nbsp;0.180000007&nbsp;,&nbsp;0.180000007&nbsp;,&nbsp;0.200000003&nbsp;,&nb=
sp;0.200000003&nbsp;,&nbsp;0.200000003&nbsp;,<BR>
&nbsp;0.200000003&nbsp;,&nbsp;0.200000003&nbsp;,&nbsp;0.200000003&nbsp;,&nb=
sp;0.200000003&nbsp;,&nbsp;0.200000003&nbsp;,<BR>
&nbsp;0.200000003&nbsp;,&nbsp;0.200000003&nbsp;,&nbsp;0.200000003&nbsp;,&nb=
sp;0.200000003&nbsp;,&nbsp;0.25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;,<BR>
&nbsp;0.25&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;,&nbsp;0.25&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;,&nbsp;0.280000001&nbsp;,&nbsp;0.280000001&nbsp;,&nbsp;0.300000012&nbs=
p;,<BR>
&nbsp;0.300000012&nbsp;,&nbsp;0.300000012&nbsp;,&nbsp;0.400000006&nbsp;,&nb=
sp;0.400000006&nbsp;,&nbsp;0.400000006&nbsp;,<BR>
<BR>
&nbsp;-8.240&nbsp;,&nbsp;-8.240&nbsp;,&nbsp;-8.240&nbsp;,&nbsp;-8.240&nbsp;=
,&nbsp;-8.240&nbsp;,&nbsp;-8.240&nbsp;,&nbsp;-8.240&nbsp;,&nbsp;-8.240&nbsp;=
,&nbsp;&nbsp;//&nbsp;Frequency =3D 32000.<BR>
&nbsp;-8.240&nbsp;,&nbsp;-8.240&nbsp;,&nbsp;-7.447&nbsp;,&nbsp;-7.447&nbsp;=
,&nbsp;-7.447&nbsp;,&nbsp;-7.447&nbsp;,&nbsp;-7.447&nbsp;,&nbsp;-7.447&nbsp;=
,<BR>
&nbsp;-7.447&nbsp;,&nbsp;-7.447&nbsp;,&nbsp;-7.447&nbsp;,&nbsp;-7.447&nbsp;=
,&nbsp;-6.990&nbsp;,&nbsp;-6.990&nbsp;,&nbsp;-6.990&nbsp;,&nbsp;-6.990&nbsp;=
,<BR>
&nbsp;-6.990&nbsp;,&nbsp;-6.990&nbsp;,&nbsp;-6.990&nbsp;,&nbsp;-6.990&nbsp;=
,&nbsp;-6.990&nbsp;,&nbsp;-6.990&nbsp;,&nbsp;-6.020&nbsp;,&nbsp;-6.020&nbsp;=
,<BR>
&nbsp;-6.020&nbsp;,&nbsp;-6.020&nbsp;,&nbsp;-5.229&nbsp;,&nbsp;-5.229&nbsp;=
,&nbsp;-5.229&nbsp;,&nbsp;-5.229&nbsp;,&nbsp;-4.559&nbsp;,&nbsp;-4.559&nbsp;=
,<BR>
&nbsp;-3.980&nbsp;,&nbsp;-3.980&nbsp;,<BR>
<BR>
&nbsp;-8.240&nbsp;,&nbsp;-8.240&nbsp;,&nbsp;-8.240&nbsp;,&nbsp;-8.240&nbsp;=
,&nbsp;-8.240&nbsp;,&nbsp;-8.240&nbsp;,&nbsp;-8.240&nbsp;,&nbsp;-8.240&nbsp;=
,&nbsp;&nbsp;//&nbsp;Frequency =3D 44100.<BR>
&nbsp;-8.240&nbsp;,&nbsp;-8.240&nbsp;,&nbsp;-7.447&nbsp;,&nbsp;-7.447&nbsp;=
,&nbsp;-7.447&nbsp;,&nbsp;-7.447&nbsp;,&nbsp;-7.447&nbsp;,&nbsp;-7.447&nbsp;=
,<BR>
&nbsp;-7.447&nbsp;,&nbsp;-7.447&nbsp;,&nbsp;-7.447&nbsp;,&nbsp;-7.447&nbsp;=
,&nbsp;-6.990&nbsp;,&nbsp;-6.990&nbsp;,&nbsp;-6.990&nbsp;,&nbsp;-6.990&nbsp;=
,<BR>
&nbsp;-6.990&nbsp;,&nbsp;-6.990&nbsp;,&nbsp;-6.990&nbsp;,&nbsp;-6.990&nbsp;=
,&nbsp;-6.990&nbsp;,&nbsp;-6.990&nbsp;,&nbsp;-6.020&nbsp;,&nbsp;-6.020&nbsp;=
,<BR>
&nbsp;-6.020&nbsp;,&nbsp;-6.020&nbsp;,&nbsp;-5.229&nbsp;,&nbsp;-5.229&nbsp;=
,&nbsp;-5.229&nbsp;,&nbsp;-5.229&nbsp;,&nbsp;-4.559&nbsp;,<BR>
<BR>
&nbsp;-8.240&nbsp;,&nbsp;-8.240&nbsp;,&nbsp;-8.240&nbsp;,&nbsp;-8.240&nbsp;=
,&nbsp;-8.240&nbsp;,&nbsp;-8.240&nbsp;,&nbsp;-8.240&nbsp;,&nbsp;-8.240&nbsp;=
,&nbsp;&nbsp;//&nbsp;Frequency =3D 48000.<BR>
&nbsp;-8.240&nbsp;,&nbsp;-8.240&nbsp;,&nbsp;-7.447&nbsp;,&nbsp;-7.447&nbsp;=
,&nbsp;-7.447&nbsp;,&nbsp;-7.447&nbsp;,&nbsp;-7.447&nbsp;,&nbsp;-7.447&nbsp;=
,<BR>
&nbsp;-7.447&nbsp;,&nbsp;-7.447&nbsp;,&nbsp;-7.447&nbsp;,&nbsp;-7.447&nbsp;=
,&nbsp;-6.990&nbsp;,&nbsp;-6.990&nbsp;,&nbsp;-6.990&nbsp;,&nbsp;-6.990&nbsp;=
,<BR>
&nbsp;-6.990&nbsp;,&nbsp;-6.990&nbsp;,&nbsp;-6.990&nbsp;,&nbsp;-6.990&nbsp;=
,&nbsp;-6.990&nbsp;,&nbsp;-6.990&nbsp;,&nbsp;-6.020&nbsp;,&nbsp;-6.020&nbsp;=
,<BR>
&nbsp;-6.020&nbsp;,&nbsp;-6.020&nbsp;,&nbsp;-5.229&nbsp;,&nbsp;-5.229&nbsp;=
,&nbsp;-5.229&nbsp;,&nbsp;-5.229<BR>
};<BR>
<BR>
<BR>
In the psy model, we use SNR_s with the formula <BR>
nb[b] =3D ecb[b] * norm_s[b] * exp( (double) SNR_s[b] * LN_TO_LOG10 );<BR>
<BR>
You can easily notice that<BR>
&nbsp;exp(-8,240 * LN_TO_LOG10) =3D 0.15<BR>
&nbsp;exp(-7,447 * LN_TO_LOG10) =3D 0.18<BR>
=8A<BR>
<BR>
It seems that the exponential calculation is already included in the SNR_s =
table for MPEG-2,<BR>
but not for MPEG-1.<BR>
<BR>
Lionel<BR>
</TT>
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Looks like another MPEG2 bug - have you tested this after fixing it?

Mark
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Re: [MP3 ENCODER] Table SNR_s bug

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