Every time I found something interesting I was adding it the my YouTube list: https://www.youtube.com/playlist?list=PLw1tfxH2oZ8OXnTSO6u6-hbgttynp1fo3
Additionally you can find a lot of articles in the links below:
TODO: This is direct copy of txt file. Reformat and make links clickable
AngularJs Dependency Injection with TypeScript
!!!!!! https://codepen.io/martinmcwhorter/post/angularjs-1-x-with-typescript-or-es6-best-practices
Dependency Injection in Angular
!!!!!! https://blog.thoughtram.io/angular/2015/05/18/dependency-injection-in-angular-2.html
How to define static property in TypeScript Interface
https://stackoverflow.com/a/43674389
In general we shouldn't do it - move code to service
Solution for service inheritance:
https://stackoverflow.com/questions/39038791/inheritance-and-dependency-injection
Service or static method:
https://stackoverflow.com/questions/39011788/typescript-and-angularjs-static-methods-vs-services
The problem is the same in Java or other languages. Static method are hard to extends and mock that why you should use services instead of static method.
Abstract classes as Tokens in Angular
https://www.bennadel.com/blog/3327-using-abstract-classes-as-dependency-injection-tokens-for-swappable-behaviors-in-angular-4-2-3.htm
Interesting EntityManager that injects all dependencies in the base class:
https://stackoverflow.com/questions/38309481/angular-2-inject-service-into-class
Mocking ES6 modules
!!!!! https://railsware.com/blog/2017/01/10/mocking-es6-module-import-without-dependency-injection/
About TypeScript decorators in general
!!!!!!!! http://www.sparkbit.pl/typescript-decorators/
Decorators in TypeScript for DependencyInjection
!!!!!!!! http://source.coveo.com/2016/02/04/typescript-injection-decorator/
https://github.com/GermainBergeron/injector
https://github.com/GermainBergeron/dose
Decorators in TypeScript for DependencyInjection
!!!!!!!!! https://www.andrewmunsell.com/blog/dependency-injection-for-modern-javascript-using-es6-classes-and-es7-decorators/
Refactor AnglarJs into Es6
!!!!!! https://medium.com/@u_glow/upgrading-an-angular-es5-codebase-to-es6-85554288c08d
Get class name
https://stackoverflow.com/questions/29310530/get-the-class-name-of-es6-class-instance
Mocking in AnglarJs
https://www.sitepoint.com/mocking-dependencies-angularjs-tests/
About redux-ORM
http://blog.isquaredsoftware.com/2016/10/practical-redux-part-1-redux-orm-basics/
Angular Test Beds vs Dependency Injection: GREAT!!
https://kirjai.com/testing-angular-services-with-dependencies/
https://www.andrewmunsell.com/blog/dependency-injection-for-modern-javascript-using-es6-classes-and-es7-decorators/
http://blog.mgechev.com/2013/12/18/inheritance-services-controllers-in-angularjs/
https://code.tutsplus.com/tutorials/stop-nesting-functions-but-not-all-of-them--net-22315
--------------------
Nice links related to DSP
https://dsp.stackexchange.com/questions/42757/effects-of-linear-interpolation-of-a-time-series-on-its-frequency-spectrum/42761
https://math.stackexchange.com/questions/1372632/how-does-sinc-interpolation-work
http://aaronscher.com/wireless_com_SDR/RTL_SDR_AM_spectrum_demod.html
https://fas.org/man/dod-101/navy/docs/es310/FM.htm
http://jontio.zapto.org/hda1/paradise/QAM.htm
Great interactive article about complex numbers and fractals
http://acko.net/blog/how-to-fold-a-julia-fractal/
Web Audio API - missing phase info
'Sadly, even though the analyser node computes a complex fft, it doesn't give access to the complex representations, just the magnitudes of it.'
http://stackoverflow.com/questions/14169317/interpreting-web-audio-api-fft-results
OscillatorNode custom:
http://stackoverflow.com/questions/30631595/custom-wave-forms-in-web-audio-api
About coefficients:
http://themusictoolbox.net/waves/
https://jackschaedler.github.io/circles-sines-signals/dft_introduction.html
How to interpret negative frequencies
http://dsp.stackexchange.com/questions/431/what-is-the-physical-significance-of-negative-frequencies
Freq domain time resolution:
http://electronics.stackexchange.com/questions/12407/what-is-the-relation-between-fft-length-and-frequency-resolution
IQ sampling explanation (complex signal):
http://whiteboard.ping.se/SDR/IQ GREAT GREAT GREAT !!!!
https://www.youtube.com/watch?v=h_7d-m1ehoY
Very nice project about DSP and Software Defined Radio
https://github.com/simonyiszk/openwebrx
http://openwebrx.org/bsc-thesis.pdf
Capture and decode fm radio
https://witestlab.poly.edu/blog/capture-and-decode-fm-radio/
https://en.wikipedia.org/wiki/Digital_down_converter
https://en.wikipedia.org/wiki/Detector_(radio) Used in first link: polar frequency discriminator
Nice online charts:
http://fooplot.com/
Frequency response
https://codepen.io/DonKarlssonSan/post/fun-with-web-audio-api
Simple checksum:
http://stackoverflow.com/questions/811195/fast-open-source-checksum-for-small-strings
Nice article about FM radio demodulation via RTL-SDR
http://aaronscher.com/wireless_com_SDR/RTL_SDR_AM_spectrum_demod.html
CRC checksum implementation
http://stackoverflow.com/questions/21001659/crc32-algorithm-implementation-in-c-without-a-look-up-table-and-with-a-public-li
-----------------------
Harmonics of piano and violin
http://stackoverflow.com/questions/10702942/note-synthesis-harmonics-violin-piano-guitar-bass-frequencies-midi
Why sounds from octaves sounds the same
https://www.quora.com/Music-Theory-Why-do-pitches-separated-by-an-octave-sound-the-same
--------------------------
How to shift the frequency spectrum?
http://dsp.stackexchange.com/questions/1991/how-to-shift-the-frequency-spectrum
https://en.wikipedia.org/wiki/Heterodyne
--------------------------
Find beginning of signal for BPSK Demodulation
https://dsp.stackexchange.com/questions/12838/find-beginning-of-signal-for-bpsk-demodulation?noredirect=1&lq=1
--------------------------
About Window function:
https://dsp.stackexchange.com/questions/208/what-should-be-considered-when-selecting-a-windowing-function-when-smoothing-a-t
http://www.electronicdesign.com/analog/choose-right-fft-window-function-when-evaluating-precision-adcs
http://www.edn.com/electronics-news/4383713/Windowing-Functions-Improve-FFT-Results-Part-I
http://www.edn.com/electronics-news/4386852/Windowing-Functions-Improve-FFT-Results-Part-II
--------------------------
Great about Wifi with Barker codes
http://ece.eng.wayne.edu/~smahmud/ECECourses/ECE5620/Notes/Wi-Fi-Lecture.pdf
http://www.gummy-stuff.org/WiFi.htm
--------------------------
Great online book about DSP:
http://www.dspguide.com/pdfbook.htm
https://support.microsoft.com/pl-pl/help/172983/explanation-of-the-three-way-handshake-via-tcp-ip
http://www.cs.miami.edu/home/burt/learning/Csc524.032/notes/tcp_nutshell.html
http://www.masterraghu.com/subjects/np/introduction/unix_network_programming_v1.3/ch02lev1sec6.html
Symbol transition windowing
https://books.google.pl/books?id=OgsbDgAAQBAJ&lpg=PA93&dq=ofdm%20symbol%20transition&hl=pl&pg=PA93#v=onepage&q&f=false
http://rfmw.em.keysight.com/rfcomms/n4010a/n4010aWLAN/onlineguide/ofdm_raised_cosine_windowing.htm
WiFi explained
http://rfmw.em.keysight.com/wireless/helpfiles/89600b/webhelp/subsystems/wlan-ofdm/content/ofdm_80211-overview.htm
http://rfmw.em.keysight.com/wireless/helpfiles/89600b/webhelp/subsystems/wlan-ofdm/content/ofdm_basicprinciplesoverview.htm
Another great example
http://www.sharetechnote.com/html/Communication_OFDM.html
Nice articles about OFDM
http://www.skydsp.com/publications/index.htm
OFDM Symbols synchronization
https://dsp.stackexchange.com/questions/7724/how-is-symbol-synchronization-with-ofdm-done
https://dsp.stackexchange.com/questions/360/how-to-demodulate-an-ofdm-signal/368#368
OFDM pilot tones
https://dsp.stackexchange.com/questions/15164/using-pilot-tones-to-estimate-carrier-frequency-offset-in-ofdm
Complete Acoustic Communication System - 'Acoustic OFDM' GREAT!!!!!!!
https://www.nttdocomo.co.jp/english/binary/pdf/corporate/technology/rd/technical_journal/bn/vol8_2/vol8_2_004en.pdf
Nice project
http://courses.cs.washington.edu/courses/cse561/10sp/project_files/FinalReport_FCI_YH.pdf
FFT FAQ
http://dspguru.com/dsp/faqs/fft/
FFT explained (Decimation In Time) - REALLY GREAT!
https://jakevdp.github.io/blog/2013/08/28/understanding-the-fft/
FFT explained (Decimation In Time and Decimation In Frequency) - REALLY GREAT!
https://cnx.org/contents/JqoGchv3@3/Overview-of-Fast-Fourier-Trans FFT Overview
https://cnx.org/contents/zmcmahhR@7/Decimation-in-time-DIT-Radix-2 DIT
https://cnx.org/contents/XaYDVUAS@6/Decimation-in-Frequency-DIF-Ra DIF
FFT explained (Decimation In Time and Decimation In Frequency) - REALLY GREAT!!
http://www.cmlab.csie.ntu.edu.tw/cml/dsp/training/coding/transform/fft.html
FFT very clean implementation in Java (FFT Decimation In Time)
http://stackoverflow.com/questions/7821473/fft-in-javascript
http://introcs.cs.princeton.edu/java/97data/FFT.java.html < link from stackoverflow answer
http://introcs.cs.princeton.edu/java/97data/Complex.java.html < link from stackoverflow answer
FFT - Decimation In Time vs Decimation In Frequency
https://www.quora.com/What-is-the-difference-between-decimation-in-time-and-decimation-in-frequency
FFT calculator:
http://scistatcalc.blogspot.com/2013/12/fft-calculator.html
FFT output:
http://stackoverflow.com/questions/6740545/need-help-understanding-fft-output
Intuitive Understanding of the Fourier Transform and FFTs
https://www.youtube.com/watch?v=FjmwwDHT98c&t=1840s
FFT amplitudes:
https://www.mathworks.com/matlabcentral/answers/162846-amplitude-of-signal-after-fft-operation
Great about Bins and freqyency location in FFT
http://www.gaussianwaves.com/2015/11/interpreting-fft-results-complex-dft-frequency-bins-and-fftshift/
Why is the fft mirrored:
http://dsp.stackexchange.com/questions/4825/why-is-the-fft-mirrored
How to get frequency from FFT index
http://stackoverflow.com/questions/4364823/how-do-i-obtain-the-frequencies-of-each-value-in-an-fft
http://stackoverflow.com/questions/14900459/symmetric-part-after-applying-fft-is-for-which-frequencies
http://dsp.stackexchange.com/questions/282/complex-conjugate-and-ifft
FFT Zoom:
http://www.arc.id.au/ZoomFFT.html
https://dsp.stackexchange.com/questions/736/how-do-i-implement-cross-correlation-to-prove-two-audio-files-are-similar
https://tomroelandts.com/articles/how-to-create-a-simple-high-pass-filter
https://tomroelandts.com/articles/how-to-create-a-simple-low-pass-filter
https://fiiir.com/
http://dsp.stackexchange.com/questions/31066/how-many-taps-does-an-fir-filter-need?rq=1
http://stackoverflow.com/questions/3780921/dsp-converting-a-sampled-signal-from-real-samples-to-complex-samples-and-vice
Adding zeros as the imaginary is conceptually the first step in what you want
to do. Initially you have a real only signal that looks like this in the frequency
domain:
[r0, r1, r2, r3, ...]
/-~--------\
DC +Fs/2
If you stuff it with zeros for the imaginary value, you'll see that you really
have both positive and negative frequencies as mirror images:
[r0 + 0i, r1 + 0i, r2 + 0i, r3 + 0i, ...]
/--------~-\ /-~--------\
-Fs/2 DC +Fs/2
Next, you multiply that signal in the time domain by a complex tone at -Fs/4
(tuning the signal). Your signal will look like
----~-\ /-~--------\ /------
DC
So now, you filter out the center half and you get:
________/-~--------\________
DC
Then you decimate by two and you end up with:
/-~--------\
Which is what you want.
All of these steps can be performed efficiently in the time domain. If you pay
attention to all of the intermediate steps, you'll notice that there are many
places where you're multiplying by 0, +1, -1, +i, or -i. Furthermore, the half
band low pass filter will have a lot of zeros and some symmetry to exploit. Since
you know you're going to decimate by 2, you only have to calculate the samples
you intend to keep. If you work through the algebra, you'll find a lot of places
to simplify it for a clean and fast implementation.
Ultimately, this is all equivalent to a Hilbert transform, but I think it's
much easier to understand when you decompose it into pieces like this.
Converting back to real from complex is similar. You'll stuff it with zeroes
for every other sample to undo the decimation. You'll filter the complex signal
to remove an alias you just introduced. You'll tune it up by Fs/4, and then throw
away the imaginary component. (Sorry, I'm all ascii-arted out... :-)
Note that this conversion is lossy near the boundaries. You'd have to use an
infinite length filter to do it perfectly.
answered Sep 24 '10 at 6:19
xscott
https://www.dsprelated.com/showthread/comp.dsp/105302-1.php
To convert your complex sample stream to real:
1) Upsample to a higher sampling frequency, perhaps by inserting zero
samples between original samples.
2) Lowpass filter to remove signal images not centered at zero
frequency. (An efficient implementation will not perform calculations
with the zero valued samples.)
3) Frequency shift (complex modulate) the image at DC to the desired
center frequency.
4) Take the real part. (This means that an effecient version of 3)
need not calculate the imaginary component.)
The exact filter response and frequency shift will depend on the
parameters of the downconvertor in your system and perhaps the signals
you are expecting to determine the modulation of.
Dale B. Dalrymple
http://dbdimages.com