Dolph-Chebyshev Window (octave+maxima)

Started by Johann Klammer in comp.dsp23 minutes ago 6 replies

I have followed rick lyons article on this ,and using the example values he gives, the output matches. But using different parameters the...

I have followed rick lyons article on this ,and using the example values he gives, the output matches. But using different parameters the filter kenel ends up strangely wiggly. I must be doing something wrong. Here is what i've tried: in maxima: > N:32; > gamma:48/20; > M:N+1; > alpha:cosh(acosh(10^gamma)/N); > A(m):=abs(alpha*cos(%pi


Call for Tutorials @ The 11th International Conference on Computational Creativity (ICCC'20)

Started by Anonymous in comp.dsp1 week ago

(Apologies for cross-posting) Call for Tutorials @ The 11th International Conference on Computational Creativity (ICCC'20) June 29 – July...

(Apologies for cross-posting) Call for Tutorials @ The 11th International Conference on Computational Creativity (ICCC'20) June 29 – July 3 2020, Coimbra, Portugal 
 Tutorials held during 29th - 30th June The 11th International Conference on Computational Creativity (ICCC) is looking for tutorial proposals to be held along with the main conference in the historic


[Complete Moonshot] Afterburner MSD models?

Started by MatthewA in comp.dsp3 weeks ago

MOONSHOT: Look, I'm not saying I know anything about FPGAs or physics engines but... Anyone in NY wanna pool some dough and try and run a...

MOONSHOT: Look, I'm not saying I know anything about FPGAs or physics engines but... Anyone in NY wanna pool some dough and try and run a physics engine at 44.1kHz through that new afterburner card? I've started projects with less knowledge. Famouse last words: How hard could it be? https://ieeexplore.ieee.org/document/8892162


Why don't we just zero out FFT bins?

Started by bmh161 in comp.dsp4 weeks ago 32 replies
FFT

This is probably a stupid question but, well, I'm not all that smart... Instead of going through all the trouble of designing complicated...

This is probably a stupid question but, well, I'm not all that smart... Instead of going through all the trouble of designing complicated digital filters, why don't we just pick the frequencies that we want to supress and replace those bins in the FFT with zeros?


magical Black Hole image

Started by Steve Pope in comp.dsp4 weeks ago 6 replies

The Event Horizon Telescope team of course deserves a huge amount of credit for their results. But it's interesting how they got there. ...

The Event Horizon Telescope team of course deserves a huge amount of credit for their results. But it's interesting how they got there. Here's an article with some non-technical discussion: https://fivethirtyeight.com/features/forget-the-black-hole-picture-check-out-the-sweet-technolog y-that-made-it-possible/ Their data is too noisy to actually create a black hole image. So they a


history of coding

Started by RichD in comp.dsp4 weeks ago 10 replies

Recently I attended a coding seminar. The speaker very briefly reviewed the relevant history; first Hamming codes, ~1960: BCH codes, ~1970:...

Recently I attended a coding seminar. The speaker very briefly reviewed the relevant history; first Hamming codes, ~1960: BCH codes, ~1970: convolutional, 1995: polar, 2002: LDPC Clue me in - what was the advance in each case? I worked on a BCH project once, that seemed fairly efficient, how is it, or other algorithms, deficient? -- Rich


Naive question(s) about DTV

Started by Richard Owlett in comp.dsp4 weeks ago 16 replies

In the 60's I spent time as a BSEE student. Took a course using _Signals, Systems and Communication_ , Lathi , 1965 A generation later I found...

In the 60's I spent time as a BSEE student. Took a course using _Signals, Systems and Communication_ , Lathi , 1965 A generation later I found comp.dsp and obtained a copy of _Understanding Digital Signal Processing_ , Lyons, 2004 May I answers suitable for a bright high school student who reads eclectically {will account for what I've forgotten &/or never knew ;}. I've a germ of an ide...


compress the orchestra

Started by RichD in comp.dsp4 weeks ago 22 replies

Occasionally I attend recitals, where the student performs a concerto. It's a bit of a financial stretch for the music department to hire an...

Occasionally I attend recitals, where the student performs a concerto. It's a bit of a financial stretch for the music department to hire an orchestra, so a second pianist accompanies, acting as the orchestra. Thus someone has to condense the entire orchestral section down to a single instrument! A mighty job of compression indeed. How do they do that? The conductor isn't a mat...


Watermark/fingerprint image for detecing transforms

Started by Gert in comp.dsp4 weeks ago 2 replies

Hi DSP people, I have a black-box system that ingests digital images, can perform a number of transformations on it, and later spits some of...

Hi DSP people, I have a black-box system that ingests digital images, can perform a number of transformations on it, and later spits some of them out in random order. My goal is to create an algorithm to generate digital images I sent into the system so that I can identify them when/if they come out, and tell which kind of transformations they have undergone. The images I put in have a n...


non-recursive fft

Started by MatthewA in comp.dsp4 weeks 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


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