Why am I getting "too many output arguments" when I am Quantizing an input speech?

clear

clc

%----------------- Quantization -------------------------------------------

%Number of level

level=32;

%TYPE OF QUANTIZATION

% Choose to graph:

% 1 = Univorm

% 2 = Mu-law

% 3 = A-Law

option_quantization=1;

%----------------- Modulation ---------------------------------------------

%TYPE OF MODULATION

% Choose to graph:

% 1 = BPSK

% 2 = QPSK

% 3 = BPSK and QPSK

option_modulation=3;

%Loading voice

[x,fm]=audioread('4.m4a');

%Fundamental frequency

N=floor(0.02*fm);

C=xcorr(x,N,'coeff');

N1=floor(0.002*fm);

[x0,vmax]=max(C(N+N1:2*N+1));

t0=(vmax+N1)/fm;

f0=1/t0;

fundamental_frequency=strcat(num2str(f0),' Hz');

%PLOT

%Plotting input signals (voices)

figure(1)

plot(x)

axis([ 0 4500 min(x) max(x) ])

title('Input signal 1');

% Playing voices

disp('Playing input signals');

soundsc(x,fm);

pause(3);

%Quantization

[y1, x2, errorquantization] = quantize(x,option_quantization, level);

%Quantization error

quantization_error = strcat(num2str(errorquantization),' %');

%Variables to plot

xg=x2; yq=y1;

xq=x; fmq=fm;

Error I am getting:

Answer 1

[Yongjian Feng]

It looks like quantize only returns one output, not 3

help quantize

[Zanobia Masih]

What would be the best way to implement quantization for the above problem?

[Adam Danz]

@Zanobia Masih I removed the flag because this answer perfectly addresses your question. It looks like you have a new, more complicated question. You may be looking for the function quantiz but it's unclear what your inputs represent. Where did you get this code?