|
Hello, Please can someone help me with this question? I generate a 6kz sin wave and design an ideal filter using remezord and remez with cutoff frequency of 6.5k and 8khz. The filtered output in time domain matched the original signal. So is the fft output. My question is how do I calculate the SNR between these two signals? Do I do it in time domain or frequency domain? I know the formula for calculating the SNR = 20log10(sum(x)2 sum(x - x')2) where x is the original signal and x' is the filtered signal. In frequency domain since the original signal is range from -300db to 36db, and the filtered signal range from -10db to 60db. How do I calculate the SNR? Thank you in advance. Guat-Eng Gan |
|
|
SNR
Started by ●March 18, 2003
Reply by ●March 19, 20032003-03-19
|
Hi Guat-Eng! SNR is the quality measure for a single but composite waveform. One part of such a waveform is declared as signal and the rest is noise. Then, it is possible to calculate the SNR as the ratio of "signal" power and "noise" power (or their difference i dBs). Two signals, input and output, can be compared in their amplitude (gain or attenuation) or in their quality (SNRs). That means, calculate SNRi for input signal [dB], SNRo for output signal [dB], and make a difference SNRi - SNRo. That's analogous to noise factor (noise number). Predrag Valozic ----- Original Message ----- From: egan_nc <> To: <> Sent: 2003. ozujak 18 22:40 Subject: [matlab] SNR > Hello, > Please can someone help me with this question? > I generate a 6kz sin wave and design an ideal filter using remezord > and remez with cutoff frequency of 6.5k and 8khz. The filtered > output in time domain matched the original signal. So is the fft > output. My question is how do I calculate the SNR between these two > signals? Do I do it in time domain or frequency domain? I know the > formula for calculating the SNR = 20log10(sum(x)2 sum(x - x')2) > where x is the original signal and x' is the filtered signal. > In frequency domain since the original signal is range from -300db > to 36db, and the filtered signal range from -10db to 60db. How do I > calculate the SNR? > Thank you in advance. > Guat-Eng Gan > _____________________________________ > Note: If you do a simple "reply" with your email client, only the author of this message will receive your answer. You need to do a "reply all" if you want your answer to be distributed to the entire group. > > _____________________________________ > About this discussion group: > > To Join: > > To Post: > > To Leave: > > Archives: http://www.yahoogroups.com/group/matlab > > More DSP-Related Groups: http://www.dsprelated.com/groups.php3 > > ">http://docs.yahoo.com/info/terms/ > |
