Why Linear Phase Filters are Used

[@iSolarSunrise]

This video is an eye opener! I especially liked the part when you explained why linear phase shift preserved the shape of the waveform. Not a lot of lectures/books/tutorials explain that like you did intuitively. So ironically the part where you said it was the least important is what I thought was the most important for me...

[@TurbidSugar19]

Omg there is no lecturer in my whole university that during lessons explained why GLP, not how(with all thoose fancy equations). I hope you became a big man in DSP world, cuz you are the guy with ANSWERS.

[@lurrehsinigang2073]

Best explanation of linear phase. thank you so much!

[@userPrehistoricman]

Essentially the FIR filter introduces a delay that's constant across all frequencies. Good video!

[@ddorran]

yes - the relative phase shift between frequency components is constant

[@sreekanths18]

Thanks for the wonderful explanation. This has helped me understand many concepts including causality.

[@vman049]

Amazing tutorial. Covered all the important points. Thank you!

[@techlearn5028]

Very useful and great amount of information. Thanks

[@dragoncurveenthusiast]

Excellent explanation. Very helpful. Thank you!

[@gyandeep8234]

Awesome video . Thank You Sir

[@VikasVJois]

Excellent explanation and visualization

[@mekarer]

Amazing Video. thanks for that. But regarding "Audio applications do not require linear phase filters because the human ear cannot detect phase change" - as this is a correct statements, but while audio processing does not stop at the non-liner phase filter, some further processes may be applied after the filer, such as a compressor/limiter, or a distortion (non-linear process) , which then the wave shape difference may cause the non-linear system to behave differently and produce different harmonic distortions or such... thanks.

[@nic.frasca]

this was great! thank you. so basically a linear phase filter provides a certain phase shift at a certain frequency, and for example twice that phase shift at twice the frequency? (in your case 5/3 the shift because the frequency was multiplied by 5/3 when going from 3 to 5)

[@ddorran]

that's it - and by doing that the phase difference between sinusoidal components is preserved. If the phase difference is maintained then the waveform shape will be too.

[@markhealy2347]

Excellent video!

[@ahmedgaafar5369]

very unbelievable fantastic tutorial ....damn, you are a genius teacher sir....lol.

[@patrickb.5761]

thank you so much

[@naimgorgani953]

Perfect^10000000... Real eye opener video

[@Niki0815]

I'm not quite sure about that but shouldn't you include the group delay in the filtered data? Linear phase = const. group delay, so the time signal must be shifted by the group delay to be exactely aligned with unfiltered signal

[@rwayatube]

Thank you so much, it is very useful!

[@uthmanzubairoluwatos]

Sorry why do you use FIR as linear filter and IIR as non linear filter?

[@ddorran]

Uthman Zubair It's easy to design FIR filters that have a linear phase response

[@dandical]

+Uthman Zubair no IIR has a linear phase response, but some have approximately linear phase responses which are difficult to design but more efficient.

[@ColocasiaCorm]

Heighth?

[@youmah25]

thank you

[@pedrobenevenutovaladares9734]

Awesome

[@uthmanzubairoluwatos]

very cool, linear phase preserves the phase of the signal but why dont you use a sound to show this. I mean music, it will be more convincing...because the magnitude used here are not equal it might be bcos of this, I actually understand the whole concept and phenomenon, but I have never seen any one using music to illustrate this concept, of linear phase and non linear phase.

[@ddorran]

Uthman Zubair Our auditory is pretty insensitive to phase (except for frequencies in close proximity i.e. within one quarter of the so called bark bands) so signals in which the phase has been altered generally won't be perceived as being significantly different.

[@uthmanzubairoluwatos]

Thans I also thought of it that way but still if I want to apply this phenomenon to music how will I do it? just to see what will happen.

[@ddorran]

filter the signal with a non-linear phase filter

[@Jason-uq2hw]

thanks bro!

[@TheBigBawsss]

this is G"DAMMED BEAUTIFUL!!!!