www.gusucode.com > signal 案例源码程序 matlab代码 > signal/SNROfSinusoidUsingPSDExample.m
%% SNR of Sinusoid Using PSD % Obtain the periodogram power spectral density (PSD) estimate of a 2.5 kHz % sinusoid sampled at 48 kHz. Add white noise with standard deviation % 0.00001. Use this value as input to determine the SNR. Set the random % number generator to the default settings for reproducible results. % Copyright 2015 The MathWorks, Inc. %% rng default Fi = 2500; Fs = 48e3; N = 1024; x = sin(2*pi*Fi/Fs*(1:N)) + 0.00001*randn(1,N); w = kaiser(numel(x),38); [Pxx, F] = periodogram(x,w,numel(x),Fs); SNR = snr(Pxx,F,'psd')