DSP

A suggestion for DSP consultants
Hi Guys, here's a thought for those of you who are consultants, or work for small companies doing consulting work. The next time your potential customer comments in a negative way about your consulting fee, consider saying the following to your customer: "Yes, professionals are expensive. Howeve... 21 May 2010 07:17

Does Anyone read Mr.Harris's book "Multirate signal processingfor communication systems"
On 5/18/2010 4:26 AM, Zhi.Shen wrote: Hi, Friends! Does anyone read Mr. Fredric Harris's book "Multirate signal processing for communication systems" ? I think it's a good book for engineering, but some descriptions make me confused. On page 53, Chapter 3 "For a specific example, the f... 18 May 2010 12:33

Does Anyone read Mr.Harris's book "Multirate signal processing for communication systems"
Hi, Friends! Does anyone read Mr. Fredric Harris's book "Multirate signal processing for communication systems" ? I think it's a good book for engineering, but some descriptions make me confused. On page 53, Chapter 3 "For a specific example, the filter presented in Figure 3.20 designed for 60dB side-lo... 21 May 2010 11:40

Changing interpolated delay line size
Hi there, I'm using an interpolated delay line size for audio effects such as flanger or vibrato. The trouble comes, when I want to change the delay line size. So far it seems the only way is to "stretch" the entire delay line to avoid abrupt edges that would be caused by jumping allover the line. But this works with c... 18 May 2010 04:53

Hard Limiters
Used in FM before demodulation. Do they actually do any filtering though apart from removing amplitude variations? What I have seen is that for low SNRs (carrier to noise ratios) you are better off without it! Many people have told me that too. For high SNRs they are fine ie if you are connected to the ariel. ... 19 May 2010 17:07

digital FM phenomena/question ????
In MATLAB I am simulating an digital FM receiver. FM signal: Carrier at 3MHz (last IF in real system) Sampled at 24MHz FM deviation = 30kHz Single tone = 7.5kHz FM signal is then digitally quadrature mixed down to baseband, I,Q. I and Q are decimated by 96 in 3 stages, to create 250kHz IQ data. IQ data ... 18 May 2010 20:20

Any suggestions for a LTE baseband signal generator?
Hi, I am looking for a PHY-layer LTE baseband signal generator (I and Q samples). My preference is for a software solution, if only because the cost should be lower, but I would also consider a hardware solution if the price is competitive. It is important that the signal generator be “vetted”: I am planning to... 17 May 2010 23:28

nonstationary autocorrelation but stationary PSD
Hello Forum the nonstationary autocorrelation function R(t1, t2) depends on two variables t1,t2. If t2-t1=tau, then R(t1, t1+tau) It turns out that the power spectral density S(w), for a nonstationary autocorrelation function is equal to: S(w)= FT {<R(t,t+tau)>}, the Fourier transform of the "long-time average... 17 May 2010 23:28

Circular convolution optimization
Hi there. I'm going to implement circular convolution with zero latency, however here I'll simplify it to say 1024 points latency, because I need to understand where is the problem. So let's say we have an extremely long kernel, like 1000 * 1024 points. Now this is the input: i1 i2 i3 .. i1000 (each 1024 points lon... 17 May 2010 12:24

correlation of two identical sinuosiduals
Hi, I am considering Corr(sig, sig) where sig = cos(omega*t). I use the first principle to calculate the correlation, r = sum(sig(1:n).*sig(1:n))/((n-1)*std(sig)*std(sig)), in Matlab syntax. I expect to see a correlation factor of exactly equal to 1. I am seeing the second harmonic cos(2*omega*t) shows up on the pl... 17 May 2010 14:37