I want to add noise (10dB,20dB) to my speech samples. I have used this code to add noise but i do not know how much dB of noise is been added because this is random noise

   [s, fs] = audioread(file); 

      rng default
  noise = 0.01 * rand(size(s));
  noisySig = s + noise;
  SNR4545= snr(s,noise);
  % calc SNR using equation
  sigPow_check = 10 * log10(mean(s.^2)); % signal power
  noisePow_check = 10 * log10(mean(noise.^2));% noise power
  SNR_check = sigPow_check - noisePow_check;
  fprintf('\n calculation with equation: \n');
  fprintf('SNR: %.2f dB \n', SNR_check) ;
  fprintf('noise power: %.2f dB \n', noisePow_check) ;
  fprintf('signal power: %.2f dB \n', sigPow_check) ;

Results: calculation with equation: SNR: 8.91 dB noise power: -44.78 dB signal power: -35.87 dB

[Souarv De]

SNR = 20;

Noise = randn(1,length(s)); % Generate initial noise;

Signal_Power = sum(abs(s).*abs(s))/length(s); % Signal Power

Noise_Power = sum(abs(Noise).*abs(Noise))/length(s); % Noise Power

K = (Signal_Power/Noise_Power)*10^(-SNR/10); % Scale factor xdB SNR

New_Noise = sqrt(K)*Noise; % Change Noise vector

x = S + New_Noise;

[studentmatlaber]

Here you have fixed it as SNR = 20. But shouldn't you write as SNR = Signal_Power/Noise_Power?