dow convert a signal in matlab

main.m
% Sampling frequency and time interval 
fs = 1000; % 1000 Hz
Ts = 1/fs; % 0.001 seconds
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main.m
% Quantization parameters
nbits = 8; % 8-bit quantization
nlevels = 2^nbits; % number of levels
vmax = 5; % maximum voltage of the signal
vmin = -vmax; % minimum voltage of the signal
del = (vmax-vmin)/nlevels; % quantization step size
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main.m
% Generate continuous analog signal
t = 0:Ts:1-Ts; % time vector
f = 10; % frequency of the signal
x = sin(2*pi*f*t); % signal

% Sampling
xn = x(1:fs/f:end); % sampled signal

% Quantization
xq = round(xn/del)*del; % quantized signal

% Plot original, sampled and quantized signals
subplot(3,1,1); plot(t,x); title('Original signal');
subplot(3,1,2); plot(t,xn); title('Sampled signal');
subplot(3,1,3); plot(t,xq); title('Quantized signal');
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