Anyone can please help me with my matlab program to quatize x(t)

quatize x(t) using 4 bits to obtain and plot the quantized signal xq, assuming the signal range is between -5 and 5 volts

the error: 'biquant' undefined near line 11 column 20, but i don't know how to solve it

clear all; close all
disp("Generate 0.02-second sine wave of 100 Hz and Vp=5");
fs = 8000; % Sampling rate
T = 1/fs; % Sampling interval
t = 0:T:0.02; % Duration of 0.02 second
sig = 4.5*sin(2*pi*100*t); % Generate sinusoids
bits = input("input number of bits =>");
lg = length(sig); % Length of signal vector sig
for x = 1:lg
  [Index(x), pq] = biquant(bits, -5,5, sig(x)); % Output quantized index
end
% transmitted
% received
for x=1:lg
qsig(x) = biqtdec(bits, -5,5, Index(x)); % Recover the quantized value
end
  qerr = qsig-sig; % Calculate quantized error
stairs(t,qsig); hold % Plot signal in staircase style
plot(t,sig); grid; % Plot signal
xlabel("Time (sec.)"); ylabel("Quantized x(n)")
disp("Signal to noise ratio due to quantization noise")
snr(sig,qsig);

Answer 1

[Ameer Hamza]

biquant and biqtdec are not built-in MATLAB functions. You need to download them from here:

http://read.pudn.com/downloads200/sourcecode/comm/940951/MATLABch2/biquant.m__.htm

and

http://read.pudn.com/downloads200/sourcecode/comm/940951/MATLABch2/biqtdec.m__.htm

and place it in the current folder and try to run the code again.

[Alvin Zulham]

Thanks Ameer Hamza, thank you so much for helping me. And what about the SNR, i can't use that. do you know the problem?

[Ameer Hamza]

Glad to be of help.

[Ameer Hamza]

@Alvin, snr function is provided by MATLAB with Signal Processing toolbox, You can check if you have it by typing this in command window

ver signal

[Ameer Hamza]

In case, you don't have the toolbox, you can find its definition here: https://github.com/gpeyre/matlab-toolboxes/blob/master/toolbox_signal/snr.m

[Alvin Zulham]

Thanks a lot Ameer

[ANUPRIYA LENEKAR]

when we run the program the command place enter the n bits when we enter bits then error occur biquant bits plzz suggest

Answer 2

[Aissa blk]

le lien que vouz avez donner ne fonctionne pas (pour telecharger fonction bitquant)

Answer 3

[ibrahim]

clear all; close all
disp('Generate 0.02-second sine wave of 100 Hz and Vp=5');

Generate 0.02-second sine wave of 100 Hz and Vp=5

fs=8000; % Sampling rate
T=1/fs; % Sampling interval
t=0:T:0.02; % Duration of 0.02 second
sig = 4.5*sin(2*pi*100*t); % Generate sinusoids
bits = input('input number of bits =>');

Unable to run the 'fevalJSON' function because it calls the 'input' function, which is not supported for this product offering.

lg = length(sig); % Length of signal vector sig
for x=1:lg
[sig(x) pq] = biquant(bits, -5.5, sig(x)); % Output quantized index
end
% transmitted
% received
for x=1:lg
qsig(x) = biqtdec(bits, -5,5, Index(x)); % Recover the quantized value
end
qerr = qsig-sig; % Calculate quantized error
stairs(t,qsig); hold % Plot signal in staircase style
plot(t,sig); grid; % Plot signal
xlabel('Time (sec.)'); ylabel('Quantized x(n)')
disp('Signal to noise ratio due to quantization noise')
snr(sig,qsig);