Matlab：实现混合信噪比(附完整源码)

function [noisySignal,requestedNoise] = mixSNR(signal, noise, ratio, varargin)
numSamples = size(signal,1);
% Convert noise to mono
noise = mean(noise,2);

% Trim or expand noise to match signal size
if size(noise,1)>=numSamples
    % Choose a random starting index such that you still have numSamples
    % after indexing the noise.
    start = randi(size(noise,1) - numSamples + 1);
    noise = noise(start:start+numSamples-1);
else
    numReps = ceil(numSamples/size(noise,1));
    temp = repmat(noise,numReps,1);
    start = randi(size(temp,1) - numSamples - 1);
    noise = temp(start:start+numSamples-1);
end

if nargin == 3
    signalNorm = norm(signal);
else
    signalNorm = norm(signal(varargin{1}));
end

noiseNorm = norm(noise);

goalNoiseNorm = signalNorm/(10^(ratio/20));
factor = goalNoiseNorm/noiseNorm;

requestedNoise = noise.*factor;
noisySignal = signal + requestedNoise;

end

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