Digital Signal Processing
Embedded Systems
Realtime Kernels
Lattice Wave Filters
Road Survey Software

Digital Signal Processing
Embedded Systems
Realtime Kernels
Lattice Wave Filters
Road Survey Software

I am selling out some of the implementations of double complementary lattice wave filters that I use.
It is very difficult to find nice and easy and good Lattice Wave C-code implementations and I have put my implementations out for sale.

If you search the web for lattice Wave digital filters (click here to search on Google) you will find a lot of very nice academical documents with a lot of mathematical symbols all over. Example one, Example two, Example three. Here is an excellent implementation article on Texas Instruments website. These abstract level documents do complement this C code.

THE VERY SPECIAL THING OF MINE IS MY METHOD OF MAKING THEM PHASE-LINEAR

THUS  P H A S E - L I N E A R      I I R - F I L T E R S

The output of a lattice wave double complementary filter is simultaneously:

• Highpass signal
• Lowpass signal

This is the double complementary property and if you add together the two signals you have the complete magnitude again.

They are extremely good and efficient in filterbanks, multirate or not. The power in the signal is always kept intact even if it is splitted into different partitions and this I think is unique for filters.

Lattice wave double complementary filter does not "explode" and are extremely stable. It is possible to change the filter coefficients in realtime. On the fly without that the filters behave strangely. This is very good if you have adaptive filtering processes. The Speed of an IIR filter and the stability of an FIR filter.

They build on Gazsi, L., ''Explicit formulas for lattice wave digital filters'', IEEE Trans. Circuits Syst., 1985, Vol. CAS-32, pp. 68-88.

However as I implemented the filters in floating point DSPs I simplified the filter implementation algorithms even further. I have used fixed point implementation successfully also.

The C code is ANSI-C, and should easily compile on any system.

It contains C code that generates filter coefficients for

1. Butterworth
2. Chebyshev
3. Cauer

as you can see in the following code.

You have sampling-rate, cutoff-frequency, and filter-order. Filter order is 1,3,5,7.. thus an odd number.

lw_butterworth_coefficients(&butterworth[0], 20000.0, 5000.0, order) ;
lw_chebyshev_coefficients( &chebyshev[0] , 20000.0, 5000.0, order) ;
lw_cauer_coefficients ( &cauer[0], 20000.0, 5000.0, order) ;

And in addition

You get one of my methods implemented of making linear-phase filtered data . I have still a better one, a linear phase filter without impulse response but that is my secret.

This linear-phase filter method works faster than what FIR filters can accomplish given the same data. I presume continuous input data (for a number of milli seconds anyway).

The code filters an Impulse response for the three types of filters and generates text files that can be read by Excel. The code also contains FFT and magnitude calculation so that you have text file outputs for the filter magnitude. I use the Brigham method in the C - code for FFT where you use a 512 points complex FFT for 1024 points of real values. It goes quicker. It takes some time to execute the C code but that is because of that it creates text files on your system and writes into them and then because of that excel likes a "," instead of a "." for like 0.00345 it converts all "." to "," and that also takes some time. Excel likes 0,00345 for decimal number.

The output is thus

1. six NON linear filtered impulse responses
2. six linear filtered impulse responses
3. six magnitudes from FFT of NON linear filtered impulse responses
4. six magnitudes from FFT of linear filtered impulse responses

You can see the filter magnitude for

• Butterworth both lowpass and highpass
• Chebyshev both lowpass and highpass
• Cauer both lowpass and highpass

Here are the magnitudes of the 3 filters FFT:ed phase linear filter response giving 6 outputs. And here is a link to excel file.

CLICK on following image for greater detail.

Here is a link to excel file for Butterworth impulse response. Both NON-linear and linear

And below you have the LINEAR PHASE impulse response of both low and highpass filtered impulse that is later inserted into the FFT.

CLICK on it for greater detail

Both impulse response of Butterworth Linear phase and NON linear phase. The first impulse is the linear phase filter and you can see how nice and symmetric it is. The non-linear filter tilts, and you can see that at point 14 the pink point is higher then at point 16. This is due to the unstationary part of the difference equation that makes the filter. This is not seen for the linear phase filter as it is only running in the stationary part of the difference equation.

Click on the image to get up to 1600 pixels

Pay now $9.95 through PayPal.      

1. Click the Buy Now button.
2. You will be taken to the PayPal secure checkout page.
3. You may then safely enter either your card details or pay using your PayPal account.
4. You will receive immediate email confirmation of your payment.

Oberon Data och Elektronik AB will never be aware of your card details at any point. Payment is handled securely and safely by PayPal.

Then you get a link via email where you can download the software.

Digital Signal Processing
Embedded Systems
Realtime Kernels
Lattice Wave Filters
Road Survey Software

• · IRI (international road evenness index) 
  · RMS (four values for four wavelengths) 
  · Textur (MPD) 
  · Longitudinal profile (5 cm or 10 cm) 
  · Distance (in millimeter) 

 (example of an IRI plot)  (example of a profile plot for the same road)

Digital Signal Processing
Embedded Systems
Realtime Kernels
Lattice Wave Filters
Road Survey Software

Kenneth Blake

Kenneth has three academical merits as:

1. Master of Science in Computer Science and Engineering (Linkoping Univ.)
2. Masters degree in Management and Organisation (Stockholm Univ.)
3. Executive Master of Business Administration (Stockholm Univ.).

Kenneth Blake is also a qualified NLP Trainer, Master NLP Practitioner. Trained to the highest standard by Dr. Richard Bandler (Creator of NLP), John La Valle (President of NLP Society), Paul McKenna (Europe's leading Hypnotherapist), and Michael Breen, and has therefore learnt from, and modelled, the most respected people in the business.

Kenneth's CV

Kenneth has also been in Bryssels several evaluating research proposals under the fifth, sixth and seventh framework programme of the European Community for research, technical development and demonstration activities.

You may also check out:

1. http://www.goodman-blake.com
   
2. http://www.blaketalks.com a site for hypnotical inductions stop / quit smoking,weightloss, breast enlargement, Inoculate you for anxiety about meeting women, Lose your fear, Permanent Self - Esteem
   
3. http://www.strandkliniken.se (bröstförstoring, plastikkirurgi, fettsugning-laser, bukplastik, åderbråck) where I do the business side.

This is a link to Kenneth's Executive MBA thesis " leadership across the world ". A cross cultural study of the impact of how a common leadership concept can be migrated into different cultures. (This pdf file is the most dowloaded item in this website, many, many, times every day.).

Why not take a look at my friend Nigel in Manchester's website he is a Professional Manchester Hypnotherapist, NLP Therapist, EFT Practitioner and Life Coach in the Greater Manchester, Lancashire and Cheshire area.
Nigel Magowan offers help with anxiety and panic attacks, irritable bowel syndrome, stop or quit smoking, weight control, unwanted habits, fears and phobias, confidence and self esteem, memory, study habits and much more.

http://www.hypnotize.me.uk 

Digital Signal Processing
Embedded Systems
Realtime Kernels
Lattice Wave Filters
Road Survey Software

Digital Signal Processing
Embedded Systems
Realtime Kernels
Lattice Wave Filters
Road Survey Software

Occasionally I do software work
as I now have more of a leadership role these days
but someone popped the question and said
are you any good at communications
and I assumed it was about human communications.

well
I said
if you mean like public speaking communication you may attend a course that Tayla and I give courses in as we both have studied NLP and are at the level of NLP trainers and I am also making my own hypnotical inductions

Ok
he said
but what do you do otherwise
and I said
I do the business side of a plastic surgery clinic in Sweden.

Ok
he said again
he said
but I have loads of money

and I paused and I said
Do continue ....

and if you feel that this methaphor is appropriate for you may email me at : ken@oberon.se

If you are

looking for

Plastic Surgery (Plastikkirurgi)

in Sweden,

OR Breast Enlargements

(bröstförstoring)

Stockholm Strand - SPA - Medispa - Konferens - Möte - Event - Möteslokal - Kurslokal - Seminarie - Business lounge - konferenslokal- Stockholm city

Stockholm Strand - SPA - Medispa - Konferens - Möte - Event - Möteslokal - Kurslokal - Seminarie - Business lounge - konferenslokal- Stockholm city

Plastikkirurgi ögonlock ögonlocksplastik bröstförstoringPlastikkirurgi in Stockholm

Plastikkirurgi åderbråck bröstförstoringPlastikkirurgi åderbråcksbehandlingar in Stockholm

Plastikkirurgi fettsugning åderbråck in Stockholm

Plastikkirurgi restylane or botox in Stockholm

Plastikkirurgi bukplastik, åderbråck bröstförstoringPlastikkirurgi in Stockholm

Plastikkirurgi celluliter cellulitbehandling bröstförstoring in Stockholm

Plastikkirurgi viktminskning, gå ner i vikt, viktprogram, bröstförstoring Plastikkirurgi viktproblem, bantning, viktkontroll, dietist, hälsokontroll, banta in Stockholm Plastikkirurgi bröstförstoring