robert.w.adams's articles:

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Strange Discrete Fourier Transform question 18 19 (7/30/2006 11:47:35 AM) comp.dsp Suppose that I have a finite-length discrete-time signal that is not necessarily sampled on a uniform time grid. I will characterize this signal as a series of time-amplitude pairs with time = t_sub_k and ampli... robert

Digital equivelant of passive LC filters 1 22 (5/24/2006 9:31:32 AM) comp.dsp If you have an analog network consisting entirely of inductors and capacitors, with NO resistive elements, then the impulse response will ring forever (since there are no "dissapative" elements that can get h... robert

windowing question #2 23 21 (4/25/2006 3:47:07 PM) comp.dsp Suppose that I have a continous-time signal that consists of a finite number of Dirac impulses at integer time points. For example, lets say the signal starts at t=0 and lasts for 100 seconds, with 100 dirac im... robert

time-varying dynamic system 11 32 (12/21/2005 9:35:52 AM) comp.dsp I have a time-varying continuous dynamic system described by the following; Two couped "integrators", where an integrator is a device that at time "t" outputs the integral from time 0 to t of its input; The o... robert

Fourier Transform challenge 16 29 (12/1/2005 10:00:24 AM) comp.dsp I am trying to take the Fourier transform of the following time function; f(t) = exp(-t)/(exp(exp(-t)), from t = -inf to t= +inf This function approaches 0 at both time extremes, and seems well-behaved; num... robert

Fourier Transform Question #2 5 25 (8/2/2004 7:39:41 PM) comp.dsp Suppose I have a signal x(t) with Fourier Transform X(jw). It is known that if one scales the time axis by a factor K, then the frequency axis is scaled by 1/K. I am curious about non-linear scalings of the tim... robert

Help proving theorom 2 38 (7/25/2004 2:53:14 PM) comp.dsp I have a theorom I am trying to prove, that is part of a proof for a more important theorom. I hope that someone whose math skills exceed mine can help! Start with: 1) Given an infinite-energy signal v(t) (... robert

robert.w.adams's replies:

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how to limit the non-zero bits in CSD representation? 5 18 (12/25/2008 9:31:10 AM) comp.dsp Hi, all.I'm totally confused...I don't think we can limit the nonzero bits in CSD representaion... In my undersatding, CSD is transformed from the 2's complement representation. So, once the 2's complement rep... lxx.helen (8)

high pass filter at very low frequency 6 42 (12/23/2008 11:44:43 PM) comp.dsp Assume the sampling rate is at 100kHz and we want to create a high pass filter with cut-off frequency at 1Hz, so the ratio between fc and fs is 0.00 001. Is there a solution for this type of problem? James www... digitalsignal999 (148)

Strange Discrete Fourier Transform question 18 19 (7/30/2006 11:47:35 AM) comp.dsp Suppose that I have a finite-length discrete-time signal that is not necessarily sampled on a uniform time grid. I will characterize this signal as a series of time-amplitude pairs with time = t_sub_k and ampli... robert.w.adams (26)

Adapting a lattice filter 6 25 (5/23/2006 12:33:39 PM) comp.dsp Hi, I am planning to use a lattice adaptive filter for system identification I am unable to find method to update the km�s in the lattice. What have missed? We can convert any FIR to a lattice and can adapt... lalin01 (6)

windowing question #2 23 21 (4/25/2006 3:47:07 PM) comp.dsp Suppose that I have a continous-time signal that consists of a finite number of Dirac impulses at integer time points. For example, lets say the signal starts at t=0 and lasts for 100 seconds, with 100 dirac im... robert.w.adams (26)

time-varying dynamic system 11 32 (12/21/2005 9:35:52 AM) comp.dsp I have a time-varying continuous dynamic system described by the following; Two couped "integrators", where an integrator is a device that at time "t" outputs the integral from time 0 to t of its input; The o... robert.w.adams (26)

Audio Compressor/AGC in C or C++ 34 27 (12/9/2005 1:46:14 PM) comp.dsp I'd like to find source for audio compression classes or functions in C or C++. It would be nice if it had lookahead (slight delay is OK). ... __GG (3)

Fourier Transform challenge 16 29 (12/1/2005 10:00:24 AM) comp.dsp I am trying to take the Fourier transform of the following time function; f(t) = exp(-t)/(exp(exp(-t)), from t = -inf to t= +inf This function approaches 0 at both time extremes, and seems well-behaved; num... robert.w.adams (26)

question about non-uniform sampling? 112 51 (11/12/2005 8:13:55 AM) comp.dsp Hi all, Can non-uniform sampled signal be used to perfectly reconstruct the original continuous time signal? What is the Nyquist sampling rate in the non-uniform case? Thanks a lot! -L ... losemind (313)

Designing IIR hilbert transform pair 6 29 (11/18/2004 9:15:51 PM) comp.dsp I'm looking at designing a pair of all-pass filters whose outputs are 90 degrees phase shifted from each other. The purpose is to create an analytic signal but avoid the processing required for the true FIR-ba... goldentully (492)