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This module contains the full compilation of testing results for the filter bank project.

Testing parameters

All data was collected on a laptop equipped with an AMD A6-3400M “Llano” quad-core processor which supports a clock rate of up to 2.3 GHz.

Test Parameters
Test Filter 4-pole Butterworth bandpass filter
Input channels 256
Time samples 600,000
Data filter cycles 100
Compiler GCC

The following results tables show the individual parameters of experiments, averaged run times of the program and an indicator of the real-time processing speed of the program (the formula to generate this figure is shown in the equation below).

F s N t = F s t N

where F s = sampling rate of incoming data (samples/sec), N = number of samples processed by filter bank (samples), and t = time to process all samples (sec).

Comparison of optimizations using compiler flags and intrinsics

Unique Filter Coefficients
Optimization Time (sec) secs/sec (25 KS/s)
None 619.940 0.25831
O3 Compiler 241.131 0.10047
O3 and SSE3 75.589 0.03150
O3 and our SSE3 69.258 0.02886
Constant Filter Coefficients
O3 and SSE3 55.835 0.02326
O3 and our SSE3 49.271 0.02053

Implementations of posix threads

4 tests under various PThread control conditions demonstrate similar patterns according to thenumber of PThreads used during code execution. Compiler Intrinsics : Implementation with naive data structures relying purely on compiler optimizations of SSE3 intrinsics Our Intrinsics : Implementation with naive data structures using our custom SSE3 intrinsics code Partial Reordering : Implementation assigning an output vector to each thread utilizing compiler intrinsics Full Reordering : Intermediate variables are aligned by channel and separated by thread
POSIX Threads
Optimization Time (sec) secs/sec (25 KS/s)
0 Threads and our SSE3 48.333 0.02014
1 Thread and our SSE3 50.109 0.02088
2 Threads and our SSE3 88.632 0.03693
4 Threads and our SSE3 138.090 0.05754
8 Threads and our SSE3 62.481 0.02603
16 Threads and our SSE3 103.901 0.04329
32 Threads and our SSE3 78.219 0.03259
0 Threads and SSE3 48.075 0.02003
1 Thread and SSE3 64.302 0.02679
2 Threads and SSE3 96.755 0.04031
4 Threads and SSE3 123.931 0.05164
8 Threads and SSE3 67.629 0.02818
16 Threads and SSE3 141.329 0.05889
32 Threads and SSE3 121.134 0.05047
Reordered Output Data
Optimization Time (sec) secs/sec (25 KS/s)
0 Threads and SSE3 50.106 0.02088
1 Thread and SSE3 49.302 0.02054
2 Threads and SSE3 78.888 0.02054
4 Threads and SSE3 89.939 0.03747
8 Threads and SSE3 35.283 0.01470
16 Threads and SSE3 71.337 0.02972
32 Threads and SSE3 109.112 0.04546
Reordered Intermediate Variables
0 Threads and SSE3 71.166 0.02965
1 Thread and SSE3 57.156 0.02382
2 Threads and SSE3 52.639 0.02193
4 Threads and SSE3 48.939 0.02039
8 Threads and SSE3 33.589 0.01400
16 Threads and SSE3 51.543 0.02148
32 Threads and SSE3 110.716 0.04613

Comparison of initial optimizations to posix thread implementation

Both tests show code execution times based on different methods of compiler optimization. Test 1 allowed for unique filter coefficients and test 2 had constant coefficients. Both tests used inefficient data arrangement.

Our optimal filter design incorporated a combination of several of the methods we used to optimize our filter bank implementation. It made use of compiler-level optimization, SSE instructions, and POSIX threads. It processed 60 million samples for each of the 256 channels in 33.589 seconds. Assuming a 25 KHz sampling rate, each second of of data is processed in 14 milliseconds (25 KS/s) and thus acceptable for real-time processing.

Questions & Answers

Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
yes that's correct
I think
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
analytical skills graphene is prepared to kill any type viruses .
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Efficient real-time filter design for recording multichannel neural activity. OpenStax CNX. Dec 11, 2012 Download for free at http://cnx.org/content/col11461/1.1
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