matlab使用getaudiodata出错

Question

function Wireless
COUNTER=2;
while COUNTER>0
Fs=8800;
flag=0;
Time_element=fix(100/9)/1000;
disp( 'waiting......' );
NN=4;
delay=Time_element*44*NN;
%%%%%%%%%%%%delayvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
pause(delay);
disp( 'now listen!' );
while (flag==0)
voice=audiorecorder(Fs,8,1);
recordblocking(voice,5);
voice = getaudiodata(voice);
plot(voice);
%voice=abs(voice);
if max(voice)*20>1 %%%%%%%%%%%%%%%%%%%%%
 flag=1;
end
end

上边是源代码，在做matlab通信原理的大作业，接收到声音后就会报错，错误如下，请问是什么原因啊，新手小白有很多地方不会，请见谅

Answer 1

a=audiorecorder(8000,16,1);
record(a);
b=getaudiodata(a);

你先找到错误函数。这行是输出错误。