All-pole lattice filter

Hi! 

I'm trying to write a matlab function to do all-pole lattice filtering,
but I can't figure out how (I don't want to use latcfilt.m). I have very
good book, M. Hayes "Statistical Digital Signal Processing and Modelling",
which describes the theory nicely but gives no clue how to perform the
filtering in practice/matlab. Is a state-space representation necessary? 

Before I ran into this I wrote a function for FIR lattice filtering which
worked well. But the inverse of my FIR lattice seems to be much more
difficult to implement...

Help would be much appreciated!

/ M



		
This message was sent using the Comp.DSP web interface on
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"MA" <oooncs@yahoo.se> writes:

> Hi! 
> 
> I'm trying to write a matlab function to do all-pole lattice filtering,
> but I can't figure out how (I don't want to use latcfilt.m). I have very
> good book, M. Hayes "Statistical Digital Signal Processing and Modelling",
> which describes the theory nicely but gives no clue how to perform the
> filtering in practice/matlab. Is a state-space representation necessary? 
> 
> Before I ran into this I wrote a function for FIR lattice filtering which
> worked well. But the inverse of my FIR lattice seems to be much more
> difficult to implement...
> 
> Help would be much appreciated!
> 
> / M

We studied 2nd-order IIR lattice filters in my DSP class at NCSU. You
can access my homework for that assignment here:

http://www.uspsdata.org/hw6.zip
-- 
Randy Yates
Sony Ericsson Mobile Communications
Research Triangle Park, NC, USA
randy.yates@sonyericsson.com, 919-472-1124

"Randy Yates" <randy.yates@sonyericsson.com> wrote in message 
news:xxpsm193den.fsf@usrts005.corpusers.net...
>
> We studied 2nd-order IIR lattice filters in my DSP class at NCSU. You
> can access my homework for that assignment here:
>
> http://www.uspsdata.org/hw6.zip

Just curious, did everyone in your class produce beautifully typeset equations 
and nicely laid text/graphics, or were you an overachiever?  (This is intended 
as a compliment!)  When I was in school, my homework was mostly pencil and 
paper, rough drawings, etc. with a few graphs printed out (dot-matrix) if I was 
going all out! 

"Jon Harris" <jon99_harris7@hotmail.com> writes:

> "Randy Yates" <randy.yates@sonyericsson.com> wrote in message 
> news:xxpsm193den.fsf@usrts005.corpusers.net...
> >
> > We studied 2nd-order IIR lattice filters in my DSP class at NCSU. You
> > can access my homework for that assignment here:
> >
> > http://www.uspsdata.org/hw6.zip
> 
> Just curious, did everyone in your class produce beautifully typeset equations 
> and nicely laid text/graphics, or were you an overachiever?  (This is intended 
> as a compliment!)

No, yes, and thanks!

> When I was in school, my homework was mostly pencil and 
> paper, rough drawings, etc. with a few graphs printed out (dot-matrix) if I was 
> going all out! 

It's amazing how quickly and nicely one can do these types of papers when you
a) have a good tool (TeX/LaTeX) and b) have had the opportunity to consistently
use the tool for a long time. I am "standing on the shoulders of giants" in that
many people in the TeX community have made lots of very powerful features available
for free. 
-- 
Randy Yates
Sony Ericsson Mobile Communications
Research Triangle Park, NC, USA
randy.yates@sonyericsson.com, 919-472-1124

Thanks a lot Randy!!! That was definitely more than I had hoped for! I'm
putting off feasting on your masterpiece until tomorrow. I'm feeling
cabbaged. Must get some sleep now.

Thanks again! 
		
This message was sent using the Comp.DSP web interface on
www.DSPRelated.com

"Randy Yates" <randy.yates@sonyericsson.com> wrote in message 
news:xxpk6ml32zd.fsf@usrts005.corpusers.net...
> "Jon Harris" <jon99_harris7@hotmail.com> writes:
>
>> "Randy Yates" <randy.yates@sonyericsson.com> wrote in message
>> news:xxpsm193den.fsf@usrts005.corpusers.net...
>> >
>> > We studied 2nd-order IIR lattice filters in my DSP class at NCSU. You
>> > can access my homework for that assignment here:
>> >
>> > http://www.uspsdata.org/hw6.zip
>>
>> Just curious, did everyone in your class produce beautifully typeset 
>> equations
>> and nicely laid text/graphics, or were you an overachiever?  (This is 
>> intended
>> as a compliment!)
>
> No, yes, and thanks!
>
>> When I was in school, my homework was mostly pencil and
>> paper, rough drawings, etc. with a few graphs printed out (dot-matrix) if 
>> I was
>> going all out!
>
> It's amazing how quickly and nicely one can do these types of papers when 
> you
> a) have a good tool (TeX/LaTeX) and b) have had the opportunity to 
> consistently
> use the tool for a long time. I am "standing on the shoulders of giants" 
> in that
> many people in the TeX community have made lots of very powerful features 
> available
> for free.

Good for you Randy!  I've not ventured into it but know folks who have 
written their engineering books using TeX or LaTeX.

When I was a freshman in engineering school we took a course called 
"Engineering Problems"
(hmmmmm ... I wonder if this is why the first thing I do is say: "now, here 
is a problem" and people thing I'm being negative whan all I'm doing is 
getting to the first step of creating a solution!  No lie.)

Anyway, the course got us familiar with a wide variety of general 
engineering calculations, tons of exercise with slide rules, etc.  We were 
trained to use Murray paper / pads (the green stuff with grid lines on the 
back).  We were trained to use a lettering template and were expected for 
the next 4 years to do all of our homework in this same very neat and 
complete fashion.  There was a format for the pages that included author, 
date, page number, etc. etc.  The stuff was so beautiful that I'm sure most 
of us kept the old homework for years and years!  We couldn't bear to part 
with it.

Then I took the opportunity to be a "reader" for a digital circuits course 
at a major university.  I was apalled at what some students considered 
adequate.  I received a term paper written with pencil on very poor quality 
lined notepad paper that had erasures that had eroded holes in the paper. 
The guy who wrote it worked in the same company as I - so I knew he could 
afford the materials and the time to do a better presentation.  I asked a 
local engineering professor about this at the time and he said that, yes, 
presentation wasn't much emphasized those days (in the late 60's)

I always thought that good presentation was important - beyond being forced 
into it initially.  It sends a message that is often received!  Jon Harris 
received yours.

Fred

PS: While I was typing this I got a phone call.  The guy asked if this was 
Missions, Inc.  or Mission Systems, Inc.  I said Yes.  Then he asked: "Is 
this Mr. Inc.  I-N-C-period?"
Then I hung up......  Presentation isn't everything but my gosh! 

Fred Marshall wrote:

> PS: While I was typing this I got a phone call.  The guy asked if
> this was Missions, Inc.  or Mission Systems, Inc.  I said Yes.
> Then he asked: "Is this Mr. Inc.  I-N-C-period?"
> Then I hung up......  Presentation isn't everything but my gosh!

You should have told him to "type any key" on the phone before hanging
up... he might have been searching for "any" on the phone keypad for
hours.

Ciao,

Peter K.

Fred Marshall wrote:
> 
> Good for you Randy!  I've not ventured into it but know folks who have
> written their engineering books using TeX or LaTeX.

These tools really are a thing of beauty.

I use pdflatex for generating slides for presentations. The .tex sources
can be kept under revision control, I use inkscape on Linux to generate
SVG graphics and get high quality, PDF slides as output.

Erik
-- 
+-----------------------------------------------------------+
  Erik de Castro Lopo  nospam@mega-nerd.com (Yes it's valid)
+-----------------------------------------------------------+
"Working with Perforce in my day job makes me really appreciate
just how good GNU Arch is." -- Erik de Castro Lopo

Peter K. wrote:
> Fred Marshall wrote:
> 
> 
>>PS: While I was typing this I got a phone call.  The guy asked if
>>this was Missions, Inc.  or Mission Systems, Inc.  I said Yes.
>>Then he asked: "Is this Mr. Inc.  I-N-C-period?"
>>Then I hung up......  Presentation isn't everything but my gosh!
> 
> 
> You should have told him to "type any key" on the phone before hanging
> up... he might have been searching for "any" on the phone keypad for
> hours.
> 
> Ciao,
> 
> Peter K.

"Type any key" is an example of the poor technical writing we accept so 
matter-of-factly. There are at least four keys that must be excluded 
from "any", and more on most keyboards: two each shift and control. I 
was recently given travel directions that required me to take the "third 
left turn". I wandered nearly half an hour before finding a policeman 
who directed me. What I wanted was the fifth left turn. My host's 
explanation? "I only count the cross streets, not the tees."

Jerry
-- 
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������

Jerry,

One of the best lines I've ever received for directions was "It's the
third apartment building from the end."  Apparently it was implied that
I was willing to drive to the end of the street and work my way
backwards.

QN