I read in the books that a periodic signal can have power but a random signal has energy. I am a bit confused by this as a white noise signal...

I read in the books that a periodic signal can have power but a random signal has energy. I am a bit confused by this as a white noise signal is random yet its variance is also the average power. Can a random signal have power or am I confused...By power here I mean instantaneous power V.I and not its integral which defines average power. thanks Tom

Hello, To what accuracy can i estimate the power of a signal.what are the different techniques to increase the accuracy of estimating the...

Hello, To what accuracy can i estimate the power of a signal.what are the different techniques to increase the accuracy of estimating the power of the signal.I am required to estimate the power of the signal to the accuracy of 10^-7 (i.e. the difference between estimated and actual power). I am giving the matlab code for estimating the power of the signal. In my stimation the accuracy i am...

Hi all, I am working on some EEG data and I would like to compute the power vs time. I know that i can perform an FFT to obtain the power,...

Hi all, I am working on some EEG data and I would like to compute the power vs time. I know that i can perform an FFT to obtain the power, however, this would be for specific frequencies. I read that the power = magnitude square of the voltage. Is it valid then to compute the power at each time point by squaring the voltage magnitude and then plotting these against time to obtain the EEG power ...

Ok I am hunting for a low-power AND low-cost DSP. I have searched all major manufacturers (Zilog, Intel, TI, AD, and Mot) and have not yet found...

Ok I am hunting for a low-power AND low-cost DSP. I have searched all major manufacturers (Zilog, Intel, TI, AD, and Mot) and have not yet found a suitable DSP to meet a stringent cost and power spec imposed on me. I've checked the TI 320 C6000, 5000, and 2000 series but they are just too expensive and consume too much power. The AD (blackfin, SHARC) chips appear to be no better on power ...

Hello DSP gurus! For a 16bit algorithm, requiring 16 MIPS (with hardware multiplier), we want the LEAST power consuming DSP/MCU! Does...

Hello DSP gurus! For a 16bit algorithm, requiring 16 MIPS (with hardware multiplier), we want the LEAST power consuming DSP/MCU! Does anything beat 2 MSP430 controllers in parallel (= 16 mW power consumption)? For instance, if you duty cycle a 300 MHz Blackfin DSP at 5.3% (=16MIPS) , do you achieve a lower power consumption? I`m worried about the large baseline power consumption and ...

I know it's associated with digital overload power, but I'm looking for a more precise definition; something like: 0 dBOV = 10*log P1/Pref,...

I know it's associated with digital overload power, but I'm looking for a more precise definition; something like: 0 dBOV = 10*log P1/Pref, where Pref is the maximum RMS SINEWAVE power possible. The basic question is this: is it RMS power or peak power, and if it is RMS power, for what type of waveform? -- Randy Yates Sony Ericsson Mobile Communications Research Triangle Park, NC, ...

Hello! A friend of mine asked me this question and before answering her, I would like your opinion as well. She asked me: I have always...

Hello! A friend of mine asked me this question and before answering her, I would like your opinion as well. She asked me: I have always calculated power spectra by multiplying the FFT signal by the complex conjugate of the FFT signal (equivalent to real^2 + imag^2) and dividing by the number of points. What is the difference between a power spectrum and a power density spectrum? A met...

Hi, I understand the problem of high Peak to Average Power Ratio in OFDM. However, I am not sure how the average power of an OFDM signal...

Hi, I understand the problem of high Peak to Average Power Ratio in OFDM. However, I am not sure how the average power of an OFDM signal is calculated. Suppose you have an N-carrier transmitter where the average power per carrier is p, what would the average power of the OFDM signal be? Thanks.

Where does the energy (or Power) get dissipated in a digital filter? For example, consider a simple analogue R-C low-pass filter driven...

Where does the energy (or Power) get dissipated in a digital filter? For example, consider a simple analogue R-C low-pass filter driven by band-limited white noise. The output power spectrum is given by Pout = |W(jw)|^2 * input noise power. Power is dissipated in the resistor. So for the digital equivalent wheree does the power go? Naebad

I have two questions: 1) Is there a difference b/w the terms 'power spectrum' and 'power spectral density'? They both seem to indicate power...

I have two questions: 1) Is there a difference b/w the terms 'power spectrum' and 'power spectral density'? They both seem to indicate power vs. frequency. 2) Suppose you are given a random sampled data sequence x[n], and you have to find its power spectrum. - Can we find the spectrum by taking the FFT of x[n] and squaring its magnitude? - Can we find the spectrum by taking the FFT of...

Hello All, I am trying to find out how much power does each individual circuit element consume in a low power radio. I know generally that...

Hello All, I am trying to find out how much power does each individual circuit element consume in a low power radio. I know generally that power amplifier and frequency synthesizer consume most of power. However I want some concrete numbers. I tried looking at data sheets of some radios like CC2420 but they dont specify the numbers. If anyone can point out some link/paper/tutorial etc, i...

Hi, I am a novice at DSP techniques. I did not find an answer regarding my question in this board or DG. I want to compare the difference in...

Hi, I am a novice at DSP techniques. I did not find an answer regarding my question in this board or DG. I want to compare the difference in total power of two signal source. I know that area under the power spectral density represents total power. I also know that PSD is symmetric about the 0.5sampling frequency (Fs). So, if I show PSD from 0-0.5Fs, its area only contains half the total powe...

Hello. I am sampling the current and voltage simultaniously. Right now I am calculating reactive power in two ways: 1). delay the...

Hello. I am sampling the current and voltage simultaniously. Right now I am calculating reactive power in two ways: 1). delay the current samples by a quarter of a period and then multiplying: Q=i(n+pi/2)*u(n) 2). or using the following procedure: P=1/(num. samples)*sum( i(n)*u(n) ) -> active power S=Irms*Urms -> apparent power Q=sqrt(P^2 - Q^2) -> reactive power U

Question regarding Power Series method of finding IZT ------------------------------------------------------- Hello. I want to clear a doubt...

Question regarding Power Series method of finding IZT ------------------------------------------------------- Hello. I want to clear a doubt regarding Power Series method for Inverse Z-transform If I have X(z) and I'm given a RoC that says that X(z) is a two-sided sequence and I'm supposed to find the IZT by Power Series method. My view is that I would not be able to find it using the said me...

Hi All, I have been recently placed on a new project related to Power Systems.I am new in this field and not getting a proper place to start...

Hi All, I have been recently placed on a new project related to Power Systems.I am new in this field and not getting a proper place to start with.So please give me your advise. The project is an Active Shunt Type Power Filter used to take out harmonics from the power line. We have an existing product selling in the market,but with an old controller design, TI DSP(TMS320C40) Dual Ram

Hi everybody! As DSP is not really my field I have a question that bothers me and I think someone here has enough experience to at least...

Hi everybody! As DSP is not really my field I have a question that bothers me and I think someone here has enough experience to at least nudge me in the right direction. In my field I frequently use power analyzer to measure RMS (square root of sum of squares) values of voltage and current. Basically I measure power of a signal. From power analyzer specs I know it has sampling frequen...

Hello Forum, near any radiating source like an antenna there is a region called the reactive field: the E and H field are 90 degrees out of...

Hello Forum, near any radiating source like an antenna there is a region called the reactive field: the E and H field are 90 degrees out of phase. The reactive field is region where there is no radiated power...... It acts as a storage power. During one cycle power is given and taken back... I am having a hard time understanding what that means. What does it means that energy is given and...

how to calculate signal and noise power hello, i have a signal current I(t)=Acos(wt+theta) How can i calculate the signal power and noise power...

how to calculate signal and noise power hello, i have a signal current I(t)=Acos(wt+theta) How can i calculate the signal power and noise power individually? thanks Reza

Everyone else has their opinion on this, so I'll give you mine... The data you get from an FFT is equivalent to a voltage, but complex. To get...

Everyone else has their opinion on this, so I'll give you mine... The data you get from an FFT is equivalent to a voltage, but complex. To get the power you need to, for each sample, sum the squares of the real and imaginary parts. This gives you the square of the magnitude which is equivalent to power. Energy is not just the sum of the power, it is the integral of power over tim

I have been given a OFDM signal of crest factor of 12dB. The crest factor is the ratio of peak power to the average power of the signal. Does...

I have been given a OFDM signal of crest factor of 12dB. The crest factor is the ratio of peak power to the average power of the signal. Does anyone have any idea how crest factor of 12dB is derived for an OFDM signal?(assumptions on peak power,average or RMS power etc). I would highly appreciate any input on this. --------------------------------------- Posted through http://www.DSPRelated.co...