MATLAB: Small variation in amplitude

signal processing

Does anybody can tell me plz,how can I make change in the amplitude of speech signal ?I need to make small variation in the amplitude.I am working in synthesize speech ,I would like to change the amplitude of the speech signal signal.

Best Answer

You can amplitude modulate the different sections.

For example, I'll amplitude modulate from 1 to 3 seconds in the following signal

Fs = 1000;
t = 0:1/Fs:5-(1/Fs);
x = cos(2*pi*100*t);
x(1000:3000) = x(1000:3000).*(1+0.2*cos(2*pi*10*t(1:2001)));

Vary the modulation depth (I've used 0.2 here) and the modulation frequency (here 10 Hz) to get a realistic variation in amplitude.

The modulation depth should be between 0 and 1, I'm guessing you want a small value like 0.1, 0.2.

The modulation frequency should probably be a low frequency as well maybe 5 Hz or less.

Related Solutions

MATLAB: How to generate a song on Matlab

Here's an example to get you started. 5 seconds of middle C.

fs = 1e4; % sampling frequency
t = 1:1/fs:5; % time signal
freq = 261.6; % note frequency in Hz (middle C)
y = sin(2*pi*freq*t); % create sine wave
player = audioplayer(y, fs); % create audio player object
play(player); % play the sound

MATLAB: Getting Blank Graph as Output

fc=154000;
fm=fc/10;
fs=100^fc;
t=0:1/fs:4/fm;
xc=cos(2*pi*fc*t);
xm=cos(2*pi*fm*t);
figure(1)
subplot(2,1,1)
plot(t,xc);
xlabel('time(sec)');
ylabel('amplitude');
title('carrier signal of 154 khz')
grid on;
size(t)
ans = 1×2
     1     0
size(xc)
ans = 1×2
     1     0
fs
fs = Inf

If you are going to take 100^ something then you are going to overflow to infinity if the exponent is more than 154 (so 10^308 output)

Best Answer

Related Solutions

MATLAB: How to generate a song on Matlab

MATLAB: Getting Blank Graph as Output

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