Physical continuation of analog filter (physical resampling)

Started by Peter Mairhofer in comp.dsp2 weeks 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 weeks 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 weeks 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 weeks 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.dsp4 weeks 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.dsp4 weeks 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.dsp4 weeks 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.


I/Q Mixing

Started by rickman in comp.dsp4 weeks ago 11 replies

Why is I/Q mixing done in receivers prior to the ADC rather than using a single mixer and converting to complex from a real data stream. Is...

Why is I/Q mixing done in receivers prior to the ADC rather than using a single mixer and converting to complex from a real data stream. Is there some aspect of the signal that is lost if the signal is not down converted with an I/Q local oscillator? -- Rick C


Applications for low-latency closed-loop control

Started by Steve M in comp.dsp1 month ago 6 replies

Folks, This is a question about applications of technology rather than how to design it. An existing application includes an ADC/floating-point...

Folks, This is a question about applications of technology rather than how to design it. An existing application includes an ADC/floating-point processor/DAC controller to provide a closed-loop solution for emulating physical circuit characteristics up to say 100KHz. The closed-loop controller was required to have an effectively negligible delay (say 200ns) up to at least that frequen


Learning Complicated Integrals from a Simple Integral in mathHandbook.com

Started by Anonymous in comp.dsp1 month ago 3 replies

Learning Complicated Integrals from a Simple Integral just define one integral of f(x) is f(x) - x, it will know not only the...

Learning Complicated Integrals from a Simple Integral just define one integral of f(x) is f(x) - x, it will know not only the integral of f(x), but also f(x+1), 2*f(2*x+2), etc. IN: integrate(f(x_), x_) := f(x) - x; integrate(2*f(x+1)) OUT: 2*f(x+1) - 2*(x+1) reference math handbook www.mathHandbook.com


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