In memoriam - Vladimir Vassilevsky

Started by Rick Lyons in comp.dsp3 months ago 28 replies

Hi, In the Russian culture it's traditional to formally remember a deceased family member, or friend, 40 days after the day of their...

Hi, In the Russian culture it's traditional to formally remember a deceased family member, or friend, 40 days after the day of their passing. Today it's been 40 days since Vladimir Vassilevsky left this world. My memory of Vlad, as his friends called him, is that he was a highly skilled engineer. Over the years of exchanging signal processing ideas with Vlad I had the distinct...


Laurel or Yanny

Started by Randy Yates in comp.dsp3 months ago 14 replies

https://en.wikipedia.org/wiki/Yanny_or_Laurel Is this for real? All I hear is unambiguously "Laurel." Are there any objective, scientific...

https://en.wikipedia.org/wiki/Yanny_or_Laurel Is this for real? All I hear is unambiguously "Laurel." Are there any objective, scientific analyses exploring this (alleged) ambiguity? -- Randy Yates, DSP/Embedded Firmware Developer Digital Signal Labs http://www.digitalsignallabs.com


The zero-order hold

Started by Anonymous in comp.dsp3 months ago 1 reply

Text books are filled with info on the DAC zero order hold and it appears on the internet everywhere. Basically its TF is (1-exp(-sT))/s where T i...

Text books are filled with info on the DAC zero order hold and it appears on the internet everywhere. Basically its TF is (1-exp(-sT))/s where T i sampling interval. Usually they take 1-z^-1 in cascade with the system transfer function and 1/s is merged into the system. If the system is G(s) then they convert (1/s)G(s) to the z domain. Doesn't this seem a little old fashioned nowada


Minimum ADC Sampling Rate / Symbol Rate for a PSK Modem with Time and Carrier Recovery.

Started by Anonymous in comp.dsp3 months ago 9 replies

Dear DSP Gurus, I have to demodulate a 50 MHz wide (3 dB bandwidth) OQPSK modulates Signal. The Signal properties are: OQPSK Modulated AWGN...

Dear DSP Gurus, I have to demodulate a 50 MHz wide (3 dB bandwidth) OQPSK modulates Signal. The Signal properties are: OQPSK Modulated AWGN channel Has Doppler Shift (5 KHz/sec max) Pulse shaping filtered (0.35) Viterbi+RS The HW I am using is: Zero IF Receiver ADC on I&Q channels (12 bit output) Has a signal processor (Output is IQ corrected,DC Removed,AGC) The Output is: I ...


Differences between laplace transform, z transform and fourier transform

Started by somanath17 in comp.dsp4 months ago 20 replies

Hi All, I have studied three diff kinds of transforms, The laplace transform, the z transform and the fourier transform. As per my...

Hi All, I have studied three diff kinds of transforms, The laplace transform, the z transform and the fourier transform. As per my understanding the usage of the above transforms are: Laplace Transforms are used primarily in continuous signal studies, more so in realizing the analog circuit equivalent and is widely used in the study of transient behaviors of systems. The Z transform is the ...


CIC Decimation Filter "zero crossing" distortion

Started by JC in comp.dsp4 months ago 6 replies

Hi, I am designing a simple decimation filter, with decimation rate at 5 (1st stage) and 20 (2nd stage). N=2 and 3 for each stage. Bin=1....

Hi, I am designing a simple decimation filter, with decimation rate at 5 (1st stage) and 20 (2nd stage). N=2 and 3 for each stage. Bin=1. Bout=16. Input Sampling frequency at 50 KHz and output at 500 Hz. The fixed point matlab simulation (2's complement) shows that with Sinewave input at 5Hz, there are a few "flat" "zero" crossing points in each sinewave cycle. I check t


OT: Who invented the airfoil?

Started by Rune Allnor in comp.dsp4 months ago 29 replies

Hi all. This is one of those questions that just popped into my mind last night: Who invented / discovered the airfoil? Like in...

Hi all. This is one of those questions that just popped into my mind last night: Who invented / discovered the airfoil? Like in aviation history. I know the Montgolfiers discovered the balloon, the Wright did the first powered flight and so on, but who was the first to describe the airforil as a component for 'heavier-than-air' flight? Lilienthal used devices very similar to what we t...


New Signal Processing with LabVIEW for measurement blog

Started by Sam Shearman in comp.dsp5 months ago 3 replies

Check out my new blog, "LabVIEW DSP" dedicated to sharing insight regarding signal processing in National Instruments LabVIEW as it relates to...

Check out my new blog, "LabVIEW DSP" dedicated to sharing insight regarding signal processing in National Instruments LabVIEW as it relates to measurement. My first two posts cover accuracy / confidence intervals and spectral averaging. Enjoy! http://www.labviewdsp.com


daily quiz

Started by RichD in comp.dsp5 months ago 5 replies

From a known genre of puzzles - "what's my hat?" - appropriate for this group, as it involves information, if not theory - Three men,...

From a known genre of puzzles - "what's my hat?" - appropriate for this group, as it involves information, if not theory - Three men, blindfolded, each wear a hat. H or T is written on each, according to coin tosses. The blindfolds are removed. Each sees the others' labels, but not his own. All must simultaneously, and immediately, guess his own label, or pass. No communicat...


OT: An Engineering Program Manager Joke

Started by Rick Lyons in comp.dsp5 months ago 12 replies

Hi, Things have been pretty quiet hear for the last few days. Having nothing more useful to post, here's a joke about Program...

Hi, Things have been pretty quiet hear for the last few days. Having nothing more useful to post, here's a joke about Program Managers; A program manager has been working his team extra hard and as a small reward offers to take two of the engineers out to lunch. Walking to the restaurant they trip over a magic lamp and out pops a genie offering them each one wish...


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