Question Regarding Digital Signal Processing - Voice Recording

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% Piece of code to Play Audio file
recobj=audiorecorder(8000,8,1,-1);%audiorecorder object with 
                                 samplerate,nbits,Number of channels & Device ID 
disp('start speaking.')         %waiting time to start speaking
recordblocking(recobj,5);       %Recording voice for 5 seconds
disp('End of recording.');      % To stop end of recording
play(recobj);                   %command to play recorder object
y=getaudiodata(recobj);         % store data in double-precision array
%plot(y)                        % Play back the record 

% y1= y + rand(size(y));        %adding noise to Original Speech Signal
f=0.8;
n=6;
X1=fir1(n,f,'high');       %Fir High Pass Filter
X2=fir1(n,f,'low');        %Fir Low Pass Filter
X3=filter(X1,1,y);         %Passing audio to designed High Pass Filter
X4=filter(X2,1,X3);
fvtool(X4,1);           % Use to display designed Fir filter and it's Magnitude 
                          Response
subplot(2,1,1)
plot(y)               % Plotting Original Speech Signal
title('Original Speech Signal')
xlabel('Time')
ylabel('Amplitude')
subplot(2,1,2);
plot(X4)                      %Plotting Filtered speech signal
title('Filtered Speech Signal')
xlabel('Time')
ylabel('Amplitude')

I have this Piece of code working on voice Speech. I want to Quantize my original voice signal using Quantiz from syntax [index,quantized] = quantiz(samp,partition,codebook). when i try to ploty=getaudiodata(recobj);% store data in double-precision array vs quantized using stairs command to get quantized signal, i am getting error. How to do this?..

[Image Analyst]

http://www.mathworks.com/matlabcentral/answers/13205#answer_18099

[Walter Roberson]

What error are you getting?

[karthikeyan Reddy Thoomu]

Dimensions did not match