Detlef Amberg has a Ph.D. in EE. He is living in Berlin and working on the design of telecommunications equipment. His professional interests include math, signal processing, embedded systems, digital/analog electronics and software defined radio.
$$ x_{(k)} = A \cdot e^{\alpha \cdot k} \cdot cos(\omega \cdot k + p)\tag{1}$$
with frequency $\omega$ , phase p , initial amplitude A and damping constant $\alpha$ . The $x_{(k)}$ are the samples of the function at equally spaced points in time.
With $x_{(k)}$ given, one often has to find the unknown parameters of the function. This can be achieved for instance with nonlinear approximation or with DFT – methods.
Hi,the coefficients will work for 192kHz samplerate, 12khz cutoff, I guarantee. For 192kHz samplerate you may not have any frequency above 96kHz, not 192khz. Check...
Hi Robmar,a biquad has 3 forward coffs and 2 feedback coffs, so your 20 coffs are 4 biquad filters. I analyzed them with Matlab and they really constitute a nice...
THX, yes, the whole plan, ( narrow bandpass, than PLL) is a misconcept. The noise mitigation has to be a part of the PLL. And yes, I want to multiply (mix) incoming...
Hi, I want to PLL on the line voltage, here in Europe 50Hz. I have a noisy signal and i use a prefilter with a complex pole pair at 0.999*exp(+/- j*2*pi*50/10000)....
Very interesting question. You sample a bandwidth limited signal with
respect to Nyquist and you have two samples, x(k) and x(k+1). What is a
lower boundary for...
Hi,your 'for' loop gets much shorter with these two linesff1 = (exp(j*2*pi*[frb -frb]/Fs));fff = poly(ff1);But that does not bring you out of the numeric troubles...
Hi,IFFT of a spectrum with the 'upper' half of the frequencies zeroed out results in a complex time signal, called 'analytic' signal with 90° phase offset between...
Hi,the standard approach to FSK demodulation: square the samples, so you get a carrier at the symbol frequency. You track this carrier with a PLL and downmix the...
In a DSL szenario with many carriers and high PAPR you just let the amplifier clip, which results in error bursts. These errors are spread over time with the descrambler...
As said, OFDM and other modulation schemes show an inherently high PAR, ie. you have that naughty peak at times. This will be clipped by your cheap power amplifier,...
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