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Recent content by vahidkh6222

  1. V

    Signal do not get value

    I think the problem is you haven't assigned any value to the output ports! So the synthesiser tool sees that non of the calculations of internal signal is really necessary, so it deletes them. For preliminary simulations, just declare some temporary ports and assign internal signals to them...
  2. V

    A silly question about perl programming

    Hello, I need to undersrtand a piece of code written in perl language. But I am stucked in the first line: $| = 1; What does this mean? is $| a variable initialised to 1? If yes, then why do we use this weird symbol as its name?! thanks in advance
  3. V

    which encoder to be used

    But RLE seems to be useful when all your data contains repetitive patterns. Otherwise it could impose more data load... other than trains of zeros that I have, sometimes I have series like 4 0 -6 0 0 185 0 -28 0 0 277.... you see zeros are more but they are not necessarily together...
  4. V

    which encoder to be used

    Hello, Assuming that I have a very sparse data-stream (16 bit/sample) which contains 80% zeros. I know that in the worst case i'll need 2*20%=40% to transfer the non-zero data along with their indices. But this seems stupid, isn't it? do you know if there is any standard coding scheme for...
  5. V

    good trainig C source for very high speed data processings?

    Hi, I am somehow familiar with C and I need a good source which explains how to use C in an efficient way for processing of large amount of data. and also how to plot data and analyze data. you know, I want to use it instead of MATLAB. I'm full of "hello world" and basic stuff, and I need a...
  6. V

    a question about microphone spacing in BSS algorithms

    proper mic spacing During my review of BSS algorithm I've realized that there exist two completely different microphone spacing approachs. - in freq domain BSS algorithms, they often use microphone spacings in the order of few centimeters (4-5-10 cm). I think that's reasonable if we consider...
  7. V

    good materil for undrstnding PLP calculation and liftering

    Hi everybody I need to learn actual calculation procedure for speech features such as PLP, mfcc,... I've found the available m files on the net, but i dont understand their parameters completely (liftering exponent, n of bands,...etc). so i need get back to the basics...please, can you help me?
  8. V

    how to constraint only limitied areas of a clock signal(ucf)

    as i said, xst automatically removes equal signals of the different name. and for some reasond i need these two regions to have the same clock_edge...
  9. V

    how to constraint only limitied areas of a clock signal(ucf)

    hi everyone I need to know, how can i limit a clock constraint to just limited areas of vhdl codr. for example i have a clock50M signal for a CIC filter. i want to constraint nets of the regions before downsampling. after downsampling there is no longer need to achieve 50Mhz clock efficiency...
  10. V

    ac block for power supply(customized RFC)?

    hi all i need to use a surface mount LNA (GALI-74+) and it requires the use of a RFC (chocke) to feed DC bias without loss of RF signal. the problem is, in my application i should use the signal in freq range of 200khz to 100 MHz and all the RFCs in minicircuits are in freq range of more than...
  11. V

    any good site for buying BP filters

    Hi all, I'm trying to find a Bandpass filter centerd at 76.8 MHz and 30 MHz bandwidth and i couldnt find any good match in minicircuits and KRFILTERS .the other sites did not provied good lists with exact specs. they usually ask your requirements and they need registration and other...
  12. V

    what is IP3 amd power @ 1dB compressiom in LNAs?

    what is ip3 hi all, i'm trying to find a suitable LNA and I noticed these two paremeters are important factors in datasheets. please tell me what htey are or show me a reference. -IP3 (interception point) -Power @ 1dB compression
  13. V

    how Linear Prediction realates to noise reduction?

    I saw several papers in google with this subject which unfortunately i have no accesss to them. can you show me a good reference about how LP analysis applies for noise reduction. specially in sampled at symbol rate digital communiation. (suppose we have binary +1,-1 corrupted with high power...
  14. V

    How To Generate a Random Process ??

    there are lots of matlab functions, the most famous ones are rand (Uniformly distributed pseudorandom numbers) and randn (Normally distributed pseudorandom numbers). anyway, still you can learn matlab functions for any other distrbution under " distribution reference" topic of matlab help...
  15. V

    what is "one sided exponential" sequence?

    thanks a lot. yes thats exaxtly it! :oO but still, do we have any "zero mean" exponential sequence?!! maybe i should just subtract the mean from resulting exp seq?!
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