daily puzzle

Started by RichD in comp.dsp7 days ago 2 replies

A quickie. No diagram, but no need. Given a unit cube, vertices labeled ABCD on the top face, EFGH on the bottom; where A E, B F, ...

A quickie. No diagram, but no need. Given a unit cube, vertices labeled ABCD on the top face, EFGH on the bottom; where A E, B F, etc. Draw diagonals GD and BD, across the appropriate faces. What is the angle GDB? You have two minutes, no calculator, pen and paper only - -- Rich


cetacean communication research

Started by David Dalton in comp.dsp2 weeks ago

The Vancouver Canucks have the orca as their main logo. Unfortunately they recently lost their series against the Vegas Golden Knights. I...

The Vancouver Canucks have the orca as their main logo. Unfortunately they recently lost their series against the Vegas Golden Knights. I think they would have better luck if they donated more (or some?) money in support of the Southern Resident orca pods, maybe including some to me for research into cetacean communication :-) though that would require me to do some work (not that my four ...


FFT Question

Started by Tom Killwhang in comp.dsp2 weeks ago 7 replies

Why is it that in older textbooks the DFT or FFT is defined as having scaling of (1/N) for direct FFT whereas in newer ones it doesn't? If we take...

Why is it that in older textbooks the DFT or FFT is defined as having scaling of (1/N) for direct FFT whereas in newer ones it doesn't? If we take the DFT of say 1,1,1,1 the answer is 4 but surely an answer of 1 makes more sense as it is the average value. of 4 ones. I know people say - "Oh we can scale it later", but it doesn't make mathematical sense. The other point is that the


FIR filter design

Started by Tom Killwhang in comp.dsp2 weeks ago 2 replies

I am trying a simple example using frequency sampling. Therefore I have N=16 weights. W=[w0 w1.....w15] and I make then as follows W=[1 1 1 1...

I am trying a simple example using frequency sampling. Therefore I have N=16 weights. W=[w0 w1.....w15] and I make then as follows W=[1 1 1 1 1 0 0 0 0 0 0 0 1 1 1 1 ] as magnitude and the phase is -k*pi*(n-1)/N where k is from 0 to N/2 giving a frequency sampling complex vector of H=[h0 h1 h2 ....h15] Now according to textbooks I have to have conjugate symmetry but exactly how does t...


CFP: Special Issue JCR Q2 Entropy journal (IF:2.419). "Artificial Intelligence and Complexity in Art, Music, Games and Design"

Started by EvoMUSART in comp.dsp4 weeks ago

Journal: Entropy (ISSN 1099-4300), section "Complexity". JCR Journal with Impact factor: 2.419 (Q2). Deadline for manuscript submissions: 30...

Journal: Entropy (ISSN 1099-4300), section "Complexity". JCR Journal with Impact factor: 2.419 (Q2). Deadline for manuscript submissions: 30 September 2020. URL:https://www.mdpi.com/journal/entropy/special_issues/ai_complexity Flyer: https://www.mdpi.com/journal/entropy/special_issue_flyer_pdf/ai_comp= lexity/web Dear colleagues, A major=E2=80=94potentially unachievable=E2=80=94challeng...


Is fixed point arithmetic important anymore

Started by Anonymous in comp.dsp1 month ago 5 replies

DO many people still do DSP in fixed point or are the processors mostly floating point and the DSP designer no longer needs to work in fixed point?

DO many people still do DSP in fixed point or are the processors mostly floating point and the DSP designer no longer needs to work in fixed point?


Fourier Series

Started by Tom Killwhang in comp.dsp1 month ago 4 replies

We all know that if you have an even function you have only cosine terms an= d an odd function only sine. When the function is neither even nor...

We all know that if you have an even function you have only cosine terms an= d an odd function only sine. When the function is neither even nor odd you = get both, or do you? This suddenly struck me. Suppose you have=20 f(x)=3Dsin(x) - this is odd since f(-x) =3D -f(x) f(x)=3Dsin(x)+1 is neither even nor odd. Now f(-x) ne -f(x) But this is just a dc level shift. Could you not therefo...


Why is this group dead?

Started by Anonymous in comp.dsp1 month ago 3 replies

Are the folks losing interest? Is DSP just too easy these days? Are the kids running circles around us? Has most of the interesting stuff...

Are the folks losing interest? Is DSP just too easy these days? Are the kids running circles around us? Has most of the interesting stuff already been explored...ie not much new coming down the pipe? DSP has always been mostly a side thing for me. I have been able to apply it to work a few times. The most recent was I had to make AC power waveforms that swept in frequency. Using s...


How to change a voice's pitch in real time?

Started by Piotr Mancini in comp.dsp2 months ago 8 replies

I just learned how to convert an audioclip from a 33.3 rpm vinyl record to 78 rpm,...

I just learned how to convert an audioclip from a 33.3 rpm vinyl record to 78 rpm, here: https://community.adobe.com/t5/audition/converting-33-recording-to-78-how/td-p/9448709?page=1 What I need is similar but probably harder. I am developing a web application based on a segment from a 2013 TV program. Only the first seconds are relevant: https://www.youtube.com/watch?v=8MF04X2aLBw T...


deriving freq-to-midi from harmonic series?

Started by MatthewA in comp.dsp3 months ago 7 replies

Forgive the ramble but I don't have to problem pinned down completely: I'm curious about the mathematical relationship between the harmonic...

Forgive the ramble but I don't have to problem pinned down completely: I'm curious about the mathematical relationship between the harmonic series= and equal temperament. I'd like to write a program that quantizes glissa= ndos into the harmonic series similar to birdsong but, of course, by defini= tion, you can't transition between equal tempered intervals with the harmon= ic series. =20...


Ask a Question to the DSPRelated community

To significantly increase your chances of receiving answers, please make sure to:

  1. Use a meaningful title
  2. Express your question clearly and well
  3. Do not use this forum to promote your product, service or business
  4. Write in clear, grammatical, correctly-spelled language
  5. Do not post content that violates a copyright