>
> Hi,
> In the previous posting i have puts the J.17 std details. The transferfunction etc..
Do you mean
"Insertion Loss between nominal Impedences = 10log10
75+(w/3000)^2/1+(w/3000)^2
That gives
H(s) = s-(75)^1/2 * 3000/s-3000;" ?
What does "Insertion Loss between nominal Impedences" mean? What are
those impedances? 10log10 of what? Of 75+(w/3000)^2/1+(w/3000)^2?
I wanted to see the document you pulled those from so I could understand
your need well enough to help. I don't understand the problem.
Jerry
--
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������
Reply by Anand●January 23, 20042004-01-23
Jerry Avins <jya@ieee.org> wrote in message news:<400d5661$0$15631$61fed72c@news.rcn.com>...
> Anand wrote:
>
> ...
>
> > Hi,
> > I don't use this log part to compute the transfer function. I get it
> > by substituting s= jw , in the equetion given in J.17 std.
> > Can you be more elobarate on this...
> > Regards
> > Anand
>
> Steer me to J.17 so I can see what it says. Maybe I didn't understand
> the problem. A Z transform implies a sampling rate. For a detailed look
> at your results, I need to know what it is. Remember: you can expect the
> actual response to depart considerably from the continuous prototype's
> as you approach fs/2.
>
> Jerry
Hi,
In the previous posting i have puts the J.17 std details. The transferfunction etc..
Reply by Jerry Avins●January 20, 20042004-01-20
Anand wrote:
...
> Hi,
> I don't use this log part to compute the transfer function. I get it
> by substituting s= jw , in the equetion given in J.17 std.
> Can you be more elobarate on this...
> Regards
> Anand
Steer me to J.17 so I can see what it says. Maybe I didn't understand
the problem. A Z transform implies a sampling rate. For a detailed look
at your results, I need to know what it is. Remember: you can expect the
actual response to depart considerably from the continuous prototype's
as you approach fs/2.
Jerry
--
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������
Reply by Anand●January 20, 20042004-01-20
Jerry Avins <jya@ieee.org> wrote in message news:<400bf6c5$0$6083$61fed72c@news.rcn.com>...
> Anand wrote:
>
> > "Robin Clark" <robinTEETH48gx@hotTEETHmail.com> wrote in message news:<pan.2004.01.17.00.42.04.550136@hotTEETHmail.com>...
> >
> >>On Fri, 16 Jan 2004 02:33:36 +0000, Anand wrote:
> >>
> >>
> >>>I am trying to implement J.17 de-emphasis cure in a 32 bit processor.
> >>>I have converted J.17 S-domain transfer function using Bilinear of
> >>>MATLAB. The maltlab plot of manitude responce matches with the table
> >>>biven in the std. But when i verify in Audio precession I get +5dB
> >>>error in the range of 2-4 Khz. I have implemented in Directform 2 type
> >>>filter. Does nay body has idea why i am getting this difference..?
> >>>Regards
> >>
> >>
> >>Give me figures. S and Z transform equations
> >
> >
> > Hi,
> > As per J.17 std
> > Insertion Loss between nominal Impedences = 10log10
> > 75+(w/3000)^2/1+(w/3000)^2
> > That gives
> > H(s) = s-(75)^1/2 * 3000/s-3000;
> > Normalizing with 18.75 dB ( gain at 0Hz as per J.17) and converting
> > into Z gives me
> >
> > H(z) = 0.1423 - 0.0817 z^-1/1-0.9394 z^-1
> >
> > Both my s and z domain plots match in MATLAB,
> > After implementing in 32 fixed point processor i get 5db differance as
> > i move to frequencies above 2k hz ...!!
> > Anand
>
> Whoa! 10log10 is for power. For voltage, you need 20log10. Start there,
> and you'll get 10 dB at the end.
>
> Jerry
Hi,
I don't use this log part to compute the transfer function. I get it
by substituting s= jw , in the equetion given in J.17 std.
Can you be more elobarate on this...
Regards
Anand
Reply by Jerry Avins●January 19, 20042004-01-19
Anand wrote:
> "Robin Clark" <robinTEETH48gx@hotTEETHmail.com> wrote in message news:<pan.2004.01.17.00.42.04.550136@hotTEETHmail.com>...
>
>>On Fri, 16 Jan 2004 02:33:36 +0000, Anand wrote:
>>
>>
>>>I am trying to implement J.17 de-emphasis cure in a 32 bit processor.
>>>I have converted J.17 S-domain transfer function using Bilinear of
>>>MATLAB. The maltlab plot of manitude responce matches with the table
>>>biven in the std. But when i verify in Audio precession I get +5dB
>>>error in the range of 2-4 Khz. I have implemented in Directform 2 type
>>>filter. Does nay body has idea why i am getting this difference..?
>>>Regards
>>
>>
>>Give me figures. S and Z transform equations
>
>
> Hi,
> As per J.17 std
> Insertion Loss between nominal Impedences = 10log10
> 75+(w/3000)^2/1+(w/3000)^2
> That gives
> H(s) = s-(75)^1/2 * 3000/s-3000;
> Normalizing with 18.75 dB ( gain at 0Hz as per J.17) and converting
> into Z gives me
>
> H(z) = 0.1423 - 0.0817 z^-1/1-0.9394 z^-1
>
> Both my s and z domain plots match in MATLAB,
> After implementing in 32 fixed point processor i get 5db differance as
> i move to frequencies above 2k hz ...!!
> Anand
Whoa! 10log10 is for power. For voltage, you need 20log10. Start there,
and you'll get 10 dB at the end.
Jerry
--
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������
Reply by Anand●January 19, 20042004-01-19
"Robin Clark" <robinTEETH48gx@hotTEETHmail.com> wrote in message news:<pan.2004.01.17.00.42.04.550136@hotTEETHmail.com>...
> On Fri, 16 Jan 2004 02:33:36 +0000, Anand wrote:
>
> > I am trying to implement J.17 de-emphasis cure in a 32 bit processor.
> > I have converted J.17 S-domain transfer function using Bilinear of
> > MATLAB. The maltlab plot of manitude responce matches with the table
> > biven in the std. But when i verify in Audio precession I get +5dB
> > error in the range of 2-4 Khz. I have implemented in Directform 2 type
> > filter. Does nay body has idea why i am getting this difference..?
> > Regards
>
>
> Give me figures. S and Z transform equations
Hi,
As per J.17 std
Insertion Loss between nominal Impedences = 10log10
75+(w/3000)^2/1+(w/3000)^2
That gives
H(s) = s-(75)^1/2 * 3000/s-3000;
Normalizing with 18.75 dB ( gain at 0Hz as per J.17) and converting
into Z gives me
H(z) = 0.1423 - 0.0817 z^-1/1-0.9394 z^-1
Both my s and z domain plots match in MATLAB,
After implementing in 32 fixed point processor i get 5db differance as
i move to frequencies above 2k hz ...!!
Anand
Reply by Anand●January 19, 20042004-01-19
"Robin Clark" <robinTEETH48gx@hotTEETHmail.com> wrote in message news:<pan.2004.01.17.00.42.04.550136@hotTEETHmail.com>...
> On Fri, 16 Jan 2004 02:33:36 +0000, Anand wrote:
>
> > I am trying to implement J.17 de-emphasis cure in a 32 bit processor.
> > I have converted J.17 S-domain transfer function using Bilinear of
> > MATLAB. The maltlab plot of manitude responce matches with the table
> > biven in the std. But when i verify in Audio precession I get +5dB
> > error in the range of 2-4 Khz. I have implemented in Directform 2 type
> > filter. Does nay body has idea why i am getting this difference..?
> > Regards
>
>
> Give me figures. S and Z transform equations
Hi,
As per J.17 std
Insertion Loss between nominal Impedences = 10log10
75+(w/3000)^2/1+(w/3000)^2
That gives
H(s) = s-(75)^1/2 * 3000/s-3000;
Normalizing with 18.75 dB ( gain at 0Hz as per J.17) and converting
into Z gives me
H(z) = 0.1423 - 0.0817 z^-1/1-0.9394 z^-1
Both my s and z domain plots match in MATLAB,
After implementing in 32 fixed point processor i get 5db differance as
i move to frequencies above 2k hz ...!!
Anand
Reply by Robin Clark●January 16, 20042004-01-16
On Fri, 16 Jan 2004 02:33:36 +0000, Anand wrote:
> I am trying to implement J.17 de-emphasis cure in a 32 bit processor.
> I have converted J.17 S-domain transfer function using Bilinear of
> MATLAB. The maltlab plot of manitude responce matches with the table
> biven in the std. But when i verify in Audio precession I get +5dB
> error in the range of 2-4 Khz. I have implemented in Directform 2 type
> filter. Does nay body has idea why i am getting this difference..?
> Regards
Give me figures. S and Z transform equations
Reply by Anand●January 16, 20042004-01-16
I am trying to implement J.17 de-emphasis cure in a 32 bit processor.
I have converted J.17 S-domain transfer function using Bilinear of
MATLAB. The maltlab plot of manitude responce matches with the table
biven in the std. But when i verify in Audio precession I get +5dB
error in the range of 2-4 Khz. I have implemented in Directform 2 type
filter. Does nay body has idea why i am getting this difference..?
Regards