So DC motors are obsolete!

Started by Anonymous in comp.dsp2 months ago 10 replies

Talked to a motor manufacturer in Germany. They don't even do DC motors any more, no call for them at all. Just ac and brushless DC which is...

Talked to a motor manufacturer in Germany. They don't even do DC motors any more, no call for them at all. Just ac and brushless DC which is really ac under a different name. Apparently with a good ac controller you can get an induction motor to have the same torque as a DC motor and you get max torque at zero speed - all down to flux vectoring. So do we throw out our brushed motors


Linear equalizers and similarities

Started by Peter Mairhofer in comp.dsp2 months ago

Hello, The usual setup: Suppose that I can model a channel as FIR filter h such that the received signal is y=h*x+w (*: convolution; x:...

Hello, The usual setup: Suppose that I can model a channel as FIR filter h such that the received signal is y=h*x+w (*: convolution; x: transmitted signal; w: measurement noise). The goal is to find an FIR equalizer g such that xhat=g*y is close to x. Writing x/y as vectors, the relation can be written as y=Hx+w. The equalizer xhat=Gzf y with Gzf = (H^T H)^-1 H^T is called the Z...


Create FM stereo from Matlab.

Started by disney_snoopy in comp.dsp3 months ago 34 replies

Hi all, I would appreciate if anyone here could help me. I was thinking to create a FM stereo with the RDS and L+R and L-R channel in...

Hi all, I would appreciate if anyone here could help me. I was thinking to create a FM stereo with the RDS and L+R and L-R channel in Matlab. But i doesnt know how to do on that... Can anyone here help me plz? Thankz


Physical continuation of analog filter (physical resampling)

Started by Peter Mairhofer in comp.dsp3 months ago 1 reply

Hi, Suppose I have frequency domain measurements from a channel between 1 and 10 GHz - for example like (c) in this...

Hi, Suppose I have frequency domain measurements from a channel between 1 and 10 GHz - for example like (c) in this figure: https://www.researchgate.net/profile/Sergey_Rylov/publication/2983309/figure/fig1/AS:39471058680 6272@1471117745152/Fig-1-Backplane-channel-characteristics-a-Backplaneline-card-application-b.pp m What is the best way to upsample the impulse response to a higher rate?


CPFSK receiver architecture

Started by gct in comp.dsp3 months ago 12 replies

I'm evaluating receiver structures for the ETSI DMR spec, but not having much luck finding any work in this area. They use continuous...

I'm evaluating receiver structures for the ETSI DMR spec, but not having much luck finding any work in this area. They use continuous phase modulation, so I anticipate I'll have to use a viterbi demodulator to get it done. Unfortunately they choose h=.27, so I have at least 200 states, times whatever number of symbol cycles their pulse shape is over (not clear on this, three maybe?). So I'm loo...


Michrophone amp with D/A for continuous speech recognition

Started by Richard Owlett in comp.dsp3 months ago 19 replies

My theory dates from 3 years towards a BSEE in the 60's. Real world experience focused on instrumentation ( 1 mV large signal, 10Hz very wide...

My theory dates from 3 years towards a BSEE in the 60's. Real world experience focused on instrumentation ( 1 mV large signal, 10Hz very wide band ;) [Ever try to convince a fresh chemistry post doc that demanding a system gain-bandwidth product allowing measuring less than 1 electron per second wasn't reasonable?] My voice recognition background is limited to reading end user oriented ...


Associative memory for decoding

Started by Anonymous in comp.dsp3 months ago 6 replies

I started writing some PSK31 software one time and it went very well until I got to the actual symbol decoding part. I'll see if I can try again...

I started writing some PSK31 software one time and it went very well until I got to the actual symbol decoding part. I'll see if I can try again using associative memory for decoding:https://groups.google.com/forum/#!topic/artificial-general-intelligence/C-LJSnjaz2c Anyway it is very interesting from a DSP point of view, particularly getting a particular value under coherency and al


sigmaDSP and similar devices

Started by rickman in comp.dsp3 months ago 34 replies

I have been watching the sigmaDSP from ADI and the similar part from TI. These parts seem ideal for a lot of applications but the problem I...

I have been watching the sigmaDSP from ADI and the similar part from TI. These parts seem ideal for a lot of applications but the problem I have is with the tools. They don't let you write your own code. You can only string together modules from their library. They are mostly filters and similar functions and I don't see how to do a lot of very basic stuff that any other processor can do. ...


Signal mixing on a delta-sigma ADC

Started by Piotr Wyderski in comp.dsp3 months ago 2 replies

I have a delta-sigma ADC with exposed modulator input pin. Its definition is as follows: "Modulator Input is used to dynamically control the...

I have a delta-sigma ADC with exposed modulator input pin. Its definition is as follows: "Modulator Input is used to dynamically control the polarity of the signal in the modulator. Polarity is inverted when ?mi? input is high. This input signal allows the user to modulate the input signal with an independent clock to act as a signal mixer." OK, I can see what happens if the modulato


Just a test, ignore me.

Started by Eric Jacobsen in comp.dsp3 months ago

My news reader responded unfavorably to a recent software update, and I'm just trying to get it synched up again. A "new" message that it...

My news reader responded unfavorably to a recent software update, and I'm just trying to get it synched up again. A "new" message that it pulled in today was from last October.


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