Labview vs. C++

Started by Tim Wescott in comp.dsp22 hours ago 20 replies

OK. Neither of the groups to which I'm cross-posting this are appropriate. But, y'all are smart, and I know who to listen to. Problem:...

OK. Neither of the groups to which I'm cross-posting this are appropriate. But, y'all are smart, and I know who to listen to. Problem: I'm working on a proposal for a customer, for an app that's going to require heavy computation and is more or less real time*. The guy I'll be working with the closest is pretty much a 100% LabView programmer -- he just doesn't _do_ C, or C++, or Fo...


Techniques behind arbitrary response or "drawable" equalizers?

Started by Anonymous in comp.dsp6 days ago 126 replies

I need to design a filter that has arbitrary response. Basically, I want to be able to almost "draw" the equalizer curve. What are the...

I need to design a filter that has arbitrary response. Basically, I want to be able to almost "draw" the equalizer curve. What are the techniques behind (FFT-based) arbitrary response or "drawable" equalizers such as: http://wiki.cockos.com/wiki/index.php/ReaFIR or http://www.elevayta.net/product4.htm


DPLL schematics for the parameters computed based on the controlled-root formulation

Started by adel in comp.dsp7 days ago 3 replies

I am trying to implement 3rd order DPLL in software using the DPLL paramete= rs from the article "Controlled-root formulation for digital...

I am trying to implement 3rd order DPLL in software using the DPLL paramete= rs from the article "Controlled-root formulation for digital phase-locked l= oops" by S.A.Stephens and J.B.Thomas (http://sci-hub.cc/10.1109/7.366295). The DPLL is a part of the GPS L1 C/A carrier tracking loop. As a basis, I am using the digital boxcar block diagram from Elliot D. Kapl= an book as shown here http://...


How are variable filters implemented?

Started by Matti Viljamaa in comp.dsp1 week ago 52 replies

How are filters that have their cutoff and e.g. Q variable (such as in a typical parametric equalizer) done? Does this mean that the filter...

How are filters that have their cutoff and e.g. Q variable (such as in a typical parametric equalizer) done? Does this mean that the filter coefficients are recalculated (i.e. the filter is redesigned) every time the parameters are changed? What kind of other design considerations are involved (such as computational efficiency)? What about "smooth parameter changes", is it interpolation (and...


Interrupt Handling in TMS320c6727

Started by ZM2016 in comp.dsp1 week ago

In TMS320C6713, pre-defined keywords for interrupts are used. For example, _c_int01, _c_int02 and so on. My question is, are these keywords...

In TMS320C6713, pre-defined keywords for interrupts are used. For example, _c_int01, _c_int02 and so on. My question is, are these keywords available in TMS320C6727 too? In other words, is the interrupt handling same in both processors on software end? Thank you --------------------------------------- Posted through http://www.DSPRelated.com


DSP question - Bandwidth Extension

Started by Mauritz Jameson in comp.dsp1 week ago 8 replies

Here's what I have: 1. Acoustic model (CMU Sphinx) to be used in a keyword spotter. Trained for= speech sampled at 16kHz and performs well....

Here's what I have: 1. Acoustic model (CMU Sphinx) to be used in a keyword spotter. Trained for= speech sampled at 16kHz and performs well. Doesn't perform well when prese= nted with a speech signal sampled at 8kHz or a speech signal with max bandw= idth of 4kHz and sample rate =3D 16kHz. 2. A microphone which only delivers a narrow-band signal. The bandwidth of = the signal is max 4kKz...


Code for I/Q mismatch calibration

Started by Peter Mairhofer in comp.dsp2 weeks ago 23 replies

Hi, Does anyone have some code for I/Q mismatch calibration/compensation for a direct conversion receiver which I may use? So far I used a...

Hi, Does anyone have some code for I/Q mismatch calibration/compensation for a direct conversion receiver which I may use? So far I used a spectrum analyzer as capturing device which can do I/Q calibration automatically ... but now I use an RF board and I have an image at -30dBc ... and NMSE=-30 dB only. I was told I should just filter out the image but this makes it even worse. I don...


up conversion using multirate technique from DC

Started by samberhanu in comp.dsp2 weeks ago 4 replies

This is something I thought I would be able to do, but seems that I am runn= ing through issues. I have a CPM spectrum signal that I want to...

This is something I thought I would be able to do, but seems that I am runn= ing through issues. I have a CPM spectrum signal that I want to convert to an IF of 600MHz. The source is an IQ pair converted at a DAC rate of 400 MHz. (2nd DAC Zone) I thought why not=20 a ) put the complex signal pair at Fs/4 sampled at 100MHz b) get the bandpass signal (Re{. } =3D> I - Q) c) downsample


Derivations of transfer functions of common filters?

Started by Matti Viljamaa in comp.dsp2 weeks ago 18 replies

I've been reading sources that merely give the transfer functions of the filters that are presented, but give no information regarding how have...

I've been reading sources that merely give the transfer functions of the filters that are presented, but give no information regarding how have these transfer functions been found. So are there any sources that would explain how the transfer functions of some common filters have been found/derived?


Using AR-MAX for compression

Started by Tim Wescott in comp.dsp2 weeks ago 1 reply

https://www.youtube.com/watch?v=RxZVMc2kjZQ -- Tim Wescott Wescott Design Services http://www.wescottdesign.com I'm looking for work...

https://www.youtube.com/watch?v=RxZVMc2kjZQ -- Tim Wescott Wescott Design Services http://www.wescottdesign.com I'm looking for work -- see my website!


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