U.S. Television Polarization

Started by Randy Yates in comp.dsp16 hours ago 8 replies

Hey Folks, I did some googling on this and couldn't get a satisfying answer. 1. What polarization is used to transmit? 2. What...

Hey Folks, I did some googling on this and couldn't get a satisfying answer. 1. What polarization is used to transmit? 2. What polarization is used to receive? The answer to question 2 would seem to be horizontal since that is the orientation of the antennas I've seen. But most broadcast TV antennas are (I believe) vertical. If I've got it right, then why do the tx/rx polarizati...


non-recursive fft

Started by MatthewA in comp.dsp3 days ago 13 replies

Is there any info on how to implement fft and ifft algorithms that aren't recursive? I'd like to possibly calculate a really long on inside a...

Is there any info on how to implement fft and ifft algorithms that aren't recursive? I'd like to possibly calculate a really long on inside a signal chain so attempting to compute a 2 second fft in one function call would probably be disastrous. -Matt


Watermark/fingerprint image for detecing transforms

Started by Gert in comp.dsp1 week ago 1 reply

Hi DSP people, I have a black-box system that ingests digital images, can perform a number of transformations on it, and later spits some of...

Hi DSP people, I have a black-box system that ingests digital images, can perform a number of transformations on it, and later spits some of them out in random order. My goal is to create an algorithm to generate digital images I sent into the system so that I can identify them when/if they come out, and tell which kind of transformations they have undergone. The images I put in have a n...


Impulse invariance method

Started by Anonymous in comp.dsp2 weeks ago 1 reply

I have a laplace transfer-function G(s)=k(1+sT)/s*2 which I need the discrete-time version G(z) using impulse invariance method. Using...

I have a laplace transfer-function G(s)=k(1+sT)/s*2 which I need the discrete-time version G(z) using impulse invariance method. Using partial fractions I get G(s) = c1/s + c2/s^2 c1=kT and c2=k However when I use Matlab c2d and select "impulse" it gives me a different version though the first term c1 is right. Matlabs second term c2 is negative. I assume for multiple pole...


compress the orchestra

Started by RichD in comp.dsp2 weeks ago 21 replies

Occasionally I attend recitals, where the student performs a concerto. It's a bit of a financial stretch for the music department to hire an...

Occasionally I attend recitals, where the student performs a concerto. It's a bit of a financial stretch for the music department to hire an orchestra, so a second pianist accompanies, acting as the orchestra. Thus someone has to condense the entire orchestral section down to a single instrument! A mighty job of compression indeed. How do they do that? The conductor isn't a mat...


Flash website- end of an era

Started by Anonymous in comp.dsp2 months ago 4 replies

Over 10 years ago I started a website ( www.fourier-series.com)in which I b= uilt interactive flash programs to teach various engineering...

Over 10 years ago I started a website ( www.fourier-series.com)in which I b= uilt interactive flash programs to teach various engineering concepts. I In= itially designed these programs to personally understand DSP and then to pa= ss along what I learned to others****. These topics were fourier series, di= screte fourier series, fourier transforms filtering I/Q modulation and also= some RF s...


Doppler effect detection

Started by Piergiorgio Sartor in comp.dsp2 months ago 16 replies

Hi all, is it possible to know, without any prior, if an incoming signal has a Doppler effect? That's it, to know if the source is...

Hi all, is it possible to know, without any prior, if an incoming signal has a Doppler effect? That's it, to know if the source is moving to (or away from) the detector without any knowledge of the frequency. I can imagine that if the source is not moving directly towards (or away) the detector, but with an angle, the Doppler effect changes hence it is detectable. How about a dir...


LOW SNR FFT

Started by Richard in comp.dsp2 months ago 6 replies

Hello, I am processing an audio signal with CS4244 codec at 24 bits and 48kHz. Every 2048 samples the FFT is calculated and its...

Hello, I am processing an audio signal with CS4244 codec at 24 bits and 48kHz. Every 2048 samples the FFT is calculated and its amplitude. Without input signal I get FFT values ​​close to 30dB. With maximum input values ​​(overflow) I get values ​​of 90dB, with a scale of 0 to 120dB. Why not get a dynamic range of 100-110dB as is logical


Naive question(s) about DTV

Started by Richard Owlett in comp.dsp3 months ago 15 replies

In the 60's I spent time as a BSEE student. Took a course using _Signals, Systems and Communication_ , Lathi , 1965 A generation later I found...

In the 60's I spent time as a BSEE student. Took a course using _Signals, Systems and Communication_ , Lathi , 1965 A generation later I found comp.dsp and obtained a copy of _Understanding Digital Signal Processing_ , Lyons, 2004 May I answers suitable for a bright high school student who reads eclectically {will account for what I've forgotten &/or never knew ;}. I've a germ of an ide...


FFT zero analyzing pink noise

Started by Richard in comp.dsp4 months ago 2 replies

Im doing the pink noise FFT. I calculate the frequency of 1kHz by adding the contribution of the corresponding bins. Is it possible that sometimes...

Im doing the pink noise FFT. I calculate the frequency of 1kHz by adding the contribution of the corresponding bins. Is it possible that sometimes the result is zero? Thanks.


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