DSP

FFT not showing high frequency oscillation
Hi all, I am new to DSP and FFT, but have managed to implement Smith's FFT algorithm. I use it to analyze audio amplifier signals. I have this one particular signal, a 1kHz sine with approx an 80kHz parasitic oscillation injected only on part of the wave (approx lasting a 1/4 phase). It is sampled at 5MSa/s. ... 16 Nov 2006 05:57

Tools for Realtime DSP
Hello there! I want to perform *realtime* audio signal processing. Could someone suggest what tool to use? I tryed to write program in JAVA but there is no chance to process sound in realtime. I have found out that it is because of internal buffering in JAVA. Now I'm thinking about C/C++. What tools do ... 15 Nov 2006 06:02

TI BIOS/CSL for 64xx/64x+ devices
Greetings, I am seeking general ideas/opinions/guidance on software development for TI DSP devices, in particular, the newer fixed point devices such as 6455. I do both algorithm development and implementation work. Most of my implementation work has been on simpler devices such as 5600, 96002, Sharc and 5510... 16 Nov 2006 23:59

LAP TIMER for RC/CAR with FFT and dsPic
Hi, I'm an italian boy, so sorry for my bad english! I've an idea, but I don't know if it's sound a good idea. I'd like to realize a lap timer for rc control car using a transponder on car and a loop antenna on/under start line, connected to a circuit to detect what car has crossed start line. An important aspect is t... 9 Nov 2006 04:39

FIR filter symmetric coefficients
Hello, What does it mean for a FIR filter to have "symmetric coefficients"? Why must the order of the filter be even for a symmetric filter? Andrew ... 9 Nov 2006 09:00

Sine from Cosines was Re: How to do square pulse wave?
For fun show how to make a sine using just cosines. Fourier did! Here's how: Since we need to represent a normally odd function by a sum of even functions, we need to make our original function even. So as Ron had suggested, perform an even extension of sin(x), so now we are working with |sin(... 8 Nov 2006 09:51

How can i get more resolution in phase?
Hello!!!!!! I would like to know how can i get more resolution in phase without increase the samples or the number of points in FFT, I've work with fft matlab function and it is very well without so many points but in my fft program i cant get better resolution. Thanks!!!!!!! ... 7 Nov 2006 20:39

AM demodulation
Hi there! I'm finding hard to get information about "switched gain AM demodulation" and how to implement it. Apparently this demodulation techique involves synchronization with the signal carrier.. Can anybody provide some hints? Regards, Luke ... 9 Nov 2006 10:34

question about design fir filter with matlab
hi all, i need to design fir filter to eliminate frequency component; my signal banwith B=10kHZ, samples Fs=20kHz signal is corrupted by four sinusoids with frequncies: F1=10kHz F2=8889Hz F3=7778Hz F4=6667Hz i found H(z)( H(z)=(z-0.5)*(z-0.3889)*(z-0.4445)*(z-0.3334)) but i dont know how can i show in the... 3 Nov 2006 11:05

OFDM receiver on my laptop -- and questions
I am working on a ISDB-T receiver implemented in software on my laptop. I am only interested in a 1-seg receiver at this point (1-seg is the single OFDM segment 422-carrier reduced BW part of the Japanese ISDB-T spec). I have an ADC connected to a Xilinx Spartan 3 FPGA and Cypress USB chip. The ADC samples the low-... 24 Nov 2006 06:24