region of convergence of z transform - why bother

Started by Anonymous in comp.dsp2 days ago

Yes I understand the theory, left handed and right-handed sequences. we can= have two z transfer functions the same but one is left hand sided...

Yes I understand the theory, left handed and right-handed sequences. we can= have two z transfer functions the same but one is left hand sided and the = other right. A great deal is spent explaining this but exactly what is the use in the fi= rst place of left-handed sequences as they are non-causal. I see in countle= ss book examples of sequences going backwards in time - find the z-transfe...


Sallen Key

Started by RichD in comp.dsp6 days ago 4 replies

Reviewing some old stuff, I crossed the Sallen-Key filter. Analysis of this topology is relatively straightforward, but what I never sussed...

Reviewing some old stuff, I crossed the Sallen-Key filter. Analysis of this topology is relatively straightforward, but what I never sussed is the why - what makes it so important? What was the great advance, at that time? And is it still considered so consequential, today? -- Rich


Rune Allnor

Started by Randy Yates in comp.dsp1 week ago 10 replies

Hello comp.dsp, I don't know if this is common knowledge, but, out-of-the-blue, I received an email from Trine-Lise Allnore, Rune's sister, on...

Hello comp.dsp, I don't know if this is common knowledge, but, out-of-the-blue, I received an email from Trine-Lise Allnore, Rune's sister, on 17-Nov-2018 which I quote below. Hi. I saw your question about my brother Rune, at a forum on the net. You postet It about 4-5 years ago, so you may not remember it.. Well, he comitted suicide in January 2012. You and another member of the ...


Better watch out, better not cry, better not pout...

Started by RichD in comp.dsp1 week ago 2 replies

.... I'm telling you why... Donald Knuth is coming to town! His annual Xmas Tree lecture. Yessir, the biggest event on the digital...

.... I'm telling you why... Donald Knuth is coming to town! His annual Xmas Tree lecture. Yessir, the biggest event on the digital calendar, Dec. 4, 6:30 PM, PST. Not to be missed by any nerd, geek, or those who aspire to such felicity. 'tree' is literal, as Knuth is the Duke of Graph Theory. Hand him any problem, he'll convert to a graph model, and go from there. There may n...


Attention FDLS Fans ...

Started by Greg Berchin in comp.dsp2 weeks ago 1 reply

I've been laid-up for the past week or so, recovering from surgery, so I used the time to create a variant of Frequency Domain Least Squares...

I've been laid-up for the past week or so, recovering from surgery, so I used the time to create a variant of Frequency Domain Least Squares (FDLS) inspired by this ancient comp.dsp thread: https://groups.google.com/d/msg/comp.dsp/MOD86bo829Y/2BAVHOxK_yQJ Whereas standard FDLS takes a magnitude/phase frequency response and attempts to create a transfer function that matches it, "FDLS Allpas...


Overcomplete Matching Pursuit with Gammatones

Started by MatthewA in comp.dsp2 weeks ago

Inspired by Smith/Lewicki’s overcomplete matching pursuit, I’m looking to put together “spikegrams” starting with Gammatones...

Inspired by Smith/Lewicki’s overcomplete matching pursuit, I’m looking to put together “spikegrams” starting with Gammatones using matching pursuit. The problem I’m coming up against in the major Matching Pursuit libraries (mptk, wmpalg, scilearn) is that they ask for discreet atoms and Gammatones are parameterized with attack, decay and phase


Nomenclature Question

Started by Greg Berchin in comp.dsp3 weeks ago 1 reply

We describe phase response as "minimum phase", "linear phase", etc. Is there a name for a phase response in which the group delay is everywhere...

We describe phase response as "minimum phase", "linear phase", etc. Is there a name for a phase response in which the group delay is everywhere nonnegative? Thanks, Greg


MELP speech compression

Started by karel bruneel in comp.dsp3 weeks ago 2 replies

Hi, Can someone pleas help me find the folowing article: "Analog to Digital Conversion of Voice by 2,400 Bit/second Mixed Excitation Linear...

Hi, Can someone pleas help me find the folowing article: "Analog to Digital Conversion of Voice by 2,400 Bit/second Mixed Excitation Linear Prediction (MELP)," Federal Information Processing Standards Publication (FIPS PUB) Draft, June 12, 1997 I?me just a poor student not able to pay 35$ for an article. Thank you Karel Bruneel


Melp1200 data memory

Started by staseer in comp.dsp3 weeks ago 3 replies

Hi, I have downloaded a melp1200 c code from the internet and am trying to port it adsp-2188. There is an array declared in qnt12_cb, by the name...

Hi, I have downloaded a melp1200 c code from the internet and am trying to port it adsp-2188. There is an array declared in qnt12_cb, by the name of res256x64x64x64 which has a size of 0x2300. The maximum segment which I can define is of 8k. I am using overlays. Is there a way to fit this array into the memory without decomposing it??? Other wise I will have to make segments of this array and k...


MELP Test Vectors

Started by Anonymous in comp.dsp3 weeks ago 10 replies

Hi, I am looking for MELP test vectors to verify my implementation. Can someone point me in the right direction? I expected they would be...

Hi, I am looking for MELP test vectors to verify my implementation. Can someone point me in the right direction? I expected they would be easy to find - considering the DDVPC have 3 publically available MELP implementations - but I can not find test vectors anywhere. Regards, Nick


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