non-recursive fft

Started by MatthewA in comp.dsp1 month ago 14 replies

Is there any info on how to implement fft and ifft algorithms that aren't recursive? I'd like to possibly calculate a really long on inside a...

Is there any info on how to implement fft and ifft algorithms that aren't recursive? I'd like to possibly calculate a really long on inside a signal chain so attempting to compute a 2 second fft in one function call would probably be disastrous. -Matt


U.S. Television Polarization

Started by Randy Yates in comp.dsp1 month ago 16 replies

Hey Folks, I did some googling on this and couldn't get a satisfying answer. 1. What polarization is used to transmit? 2. What...

Hey Folks, I did some googling on this and couldn't get a satisfying answer. 1. What polarization is used to transmit? 2. What polarization is used to receive? The answer to question 2 would seem to be horizontal since that is the orientation of the antennas I've seen. But most broadcast TV antennas are (I believe) vertical. If I've got it right, then why do the tx/rx polarizati...


Jeremiah Y Avins "Jerry"

Started by Anonymous in comp.dsp1 month ago 8 replies

I found out today that Jerry had passed away last April at the age of 85. (= 17 Apr 2018). Jerry was a true polymath and had been quite a...

I found out today that Jerry had passed away last April at the age of 85. (= 17 Apr 2018). Jerry was a true polymath and had been quite a frequent and k= nowledgeable contributor to comp.dsp. Without formal training in the field,= his ability to dig deep and reason out details was simply astounding. Jerr= y will be missed. Clay


mirroring a signal before FFT - why?

Started by Anonymous in comp.dsp1 month ago 35 replies

I am trying to make sense of some awful MATLAB code. The first thing it does is mirror the signal. By that I mean it doubles the array length,...

I am trying to make sense of some awful MATLAB code. The first thing it does is mirror the signal. By that I mean it doubles the array length, then puts a time-reversed signal at the newly created back half. So this would have the same amplitude spectum, but what else is going on? Possibly it increases the frequency resolution, as the time length is doubled. I wonder if the algorithm had som...


February 2020 Publications Announcements :International Journal of Wireless & Mobile Networks (IJWMN)

Started by Anonymous in comp.dsp1 month ago

International Journal of Wireless & Mobile Networks (IJWMN) ISSN:0975-3834 [Online]; 0975-4679 [Print] http://airccse.org/journal/ijwmn.html ...

International Journal of Wireless & Mobile Networks (IJWMN) ISSN:0975-3834 [Online]; 0975-4679 [Print] http://airccse.org/journal/ijwmn.html ********************************************************************* Scope & Topics ============== The International Journal of Wireless & Mobile Networks (IJWMN) is a bi monthly open access peer-reviewed journal that publishes...


Call for Workshop Proposals for the 11th International Conference on Computational Creativity (ICCC'20)

Started by Int. Conference on Computational Creativity in comp.dsp2 months ago

------------------------------------------------ =E2=80=A8 The 11th International Conference on Computational Creativity (ICCC'20) June 29...

------------------------------------------------ =E2=80=A8 The 11th International Conference on Computational Creativity (ICCC'20) June 29 =E2=80=93 July 3 2020, Coimbra, Portugal =E2=80=A8 Call for Workshop Proposals =E2=80=A8 Held: during 29th - 30th June at ICCC'20 =E2=80=A8 workshops-iccc20@computationalcreativity.net http://computationalcreativity.net/iccc20/=E2=80=A8 =E2=80=A8 Pl...


Holiday Greetings

Started by Richard (Rick) Lyons in comp.dsp2 months ago 17 replies

Here's wishin' all of you guys a very Merry Christmas and a Happy New Year! Of course, these good wishes are also directed at those of you...

Here's wishin' all of you guys a very Merry Christmas and a Happy New Year! Of course, these good wishes are also directed at those of you who do not celebrate Christmas such as: Muslims, Hindus, atheists, Buddhists, software engineers, Sikhs, Jews, filthy IIR filter designers, Shinto, Bolsheviks, Democrats, U.S. senator Mitch McConnell, Neo-Pagans, transsexual lesbians, Government Emp...


Band Stop Filter

Started by Rick C in comp.dsp2 months ago 20 replies

Someone is using this algorithm for high, low and band pass filter coefficients and wants to adapt it for band stop filters. ( y% is an...

Someone is using this algorithm for high, low and band pass filter coefficients and wants to adapt it for band stop filters. ( y% is an integer value that goes from filter length / 2 to +filter length / 2 ) IF y% = 0 THEN c = 1 ELSE IF BandPass THEN th1 = (fh - fl) * pi * y% ' Fhigh and Flow of passband th2 = (fh + fl) * pi * y% c = SIN(th1) * COS(th2) / th1 ...


is there a name for setting weak amplitudes to zero?

Started by Anonymous in comp.dsp2 months ago 7 replies

Clipping is when you set a strong amplitude to some fixed limit. But what about the other end - when it is small, and those tiny amplitudes are...

Clipping is when you set a strong amplitude to some fixed limit. But what about the other end - when it is small, and those tiny amplitudes are replaced by zero?


Impulse invariance method

Started by Anonymous in comp.dsp3 months ago 1 reply

I have a laplace transfer-function G(s)=k(1+sT)/s*2 which I need the discrete-time version G(z) using impulse invariance method. Using...

I have a laplace transfer-function G(s)=k(1+sT)/s*2 which I need the discrete-time version G(z) using impulse invariance method. Using partial fractions I get G(s) = c1/s + c2/s^2 c1=kT and c2=k However when I use Matlab c2d and select "impulse" it gives me a different version though the first term c1 is right. Matlabs second term c2 is negative. I assume for multiple pole...


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