četvrtak, 27.10.2011.


Filter Design Techniques - Moog Low Pass Filter

Filter Design Techniques

filter design techniques

    filter design
  • Filter design is the process of designing a filter (in the sense in which the term is used in signal processing, statistics, and applied mathematics), often a linear shift-invariant filter, which satisfies a set of requirements, some of which are contradictory.

  • Skill or ability in a particular field

  • A skillful or efficient way of doing or achieving something

  • (technique) a practical method or art applied to some particular task

  • The gameplay of the Pokemon series of role-playing video games involves the capture and training of a variety of fictional creatures called "Pokemon" and using them to battle other trainers.

  • (technique) proficiency: skillfulness in the command of fundamentals deriving from practice and familiarity; "practice greatly improves proficiency"

  • A way of carrying out a particular task, esp. the execution or performance of an artistic work or a scientific procedure

filter design techniques - Advanced Design

Advanced Design Techniques and Realizations of Microwave and RF Filters

Advanced Design Techniques and Realizations of Microwave and RF Filters

The fundamentals needed to design and realize microwave and RF filters.
Microwave and RF filters play an important role in communication systems and, owing to the proliferation of radar, satellite, and mobile wireless systems, there is a need for design methods that can satisfy the ever-increasing demand for accuracy, reliability, and shorter development times.
Beginning with a brief review of scattering and chain matrices, filter approximations and synthesis, waveguides and transmission lines, and fundamental electromagnetic equations, the book then covers design techniques for microwave and RF filters operating across a frequency range from 1 GHz to 35 GHz.
Each design chapter:
Is dedicated to only one filter and is organized by the type of filter response
Provides several design examples, including the analysis and modeling of the structures discussed and the methodologies employed
Offers practical information on the actual performance of the filters and common difficulties encountered during construction
Concludes with the construction technique, pictures of the inside and outside of the filter, and the measured performances
Advanced Design Techniques and Realizations of Microwave and RF Filters is an essential resource for wireless and telecommunication engineers, as well as for researchers interested in current microwave and RF filter design practices. It is also appropriate as a supplementary textbook for advanced undergraduate courses in filter design.

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Golden Hour Reflections

Golden Hour Reflections

I couldn't resist taking this of the view just after sunset reflected in the windows of this building along the Thames Path East at Queenhithe. ====================================================================== In part the reason for my trip to London on Sunday was to further experiment with taking shots using the circular polarising filter I recently purchased for my camera. This presented quite a challenge because most of the time I take my shots using manual settings following the Sunny-16 rule of thumb, i.e. setting exposure for shots based on my judgement of the ambient light rather than the light detected by my camera's sensor, which has served me well up until now. Whilst the Sunny-16 ( #//” ) principles for judging ambient lighting remains constant, the addition of a polarising filter on my camera's lens, that by it's design filters the light coming into the camera, meant that sticking to the Sunny-16 rule would likely result in many of my shot being considerably under-exposed. One solution to avoiding under-exposed shots whilst sticking to the Sunny-16 rule, would be to adjust the aperture down a few f/ stops to let more light in. However, this would most likely result in either over-exposed shots or uneven exposure which IMO is as bad as under-exposure. It would be fair to say I am not someone that photography comes naturally to and I have been on a steep learning curve when it comes to understanding many of the basic photography principles and how to go about using a DLSR camera best effect. So after a wee bit of research on the excellent Digicamhelp ( #//” ) website I found out a possible solution to balancing exposure is to still set the aperture based on the Sunny-16 principle of ambient light but, rather than using a standard shutter speed of 1/100 or 1/200 (depending on ISO selected) for every shot, the idea is to adjust shutter speed to achieve an evaluative metering of 0EV, or as near as, using the camera's light meter readings with the polarising filter fitted. The only disadvantage I have found in adjusting shutter speed to balance exposure is that it often requires selecting a shutter speed slower than 1/30 secs, which is about the limit for hand-held shots if you want to avoid risk of distortion, so many of the shots I took in London using these settings were taken with my camera mounted on a tripod with a 2 second timer delay. I also used my camera's mirror lock-up feature when I took hand-held shots under 1/60 secs.



A digital painting.

Dry-brush technique, of my own. No commercial program, no add-on filters, nor any foreign layers or textures. Pushed, granted. But all within its own boundaries. Neo-Impressionism.

From a walk in the woods.

View large for best appreciation of painterly qualities. The mural proportion is intentional. In the original format, the work is in very high resolution. The image is meant to be reproduced (by special program) into several 8 1/2 inch x 11 inch segments, reassembled, and mounted (at least) five feet wide. To fit a specific interior decor.


I also intend to try the same process in a ten-foot-wide example. Updates later.

filter design techniques

filter design techniques

Digital Filters Design for Signal and Image Processing (Digital Signal & Image Processing Series (ISTE-DSP))

Dealing with digital filtering methods for 1-D and 2-D signals, this book provides the theoretical background in signal processing, covering topics such as the z-transform, Shannon sampling theorem and fast Fourier transform. An entire chapter is devoted to the design of time-continuous filters which provides a useful preliminary step for analog-to-digital filter conversion.
Attention is also given to the main methods of designing finite impulse response (FIR) and infinite impulse response (IIR) filters. Bi-dimensional digital filtering (image filtering) is investigated and a study on stability analysis, a very useful tool when implementing IIR filters, is also carried out. As such, it will provide a practical and useful guide to those engaged in signal processing.

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