converting matrix with signal data to a .wav file

x=0.9.*[zeros(1,4600) ones(1,200) zeros(1,300) ones(1,200) zeros(1,4700)];
wavwrite(x,10000,8,filename)

trying to create a matrix of signal data (1's and 0's to create an amplitude modulated signal) which can be converted to a .wav file. when I generate the .wav file and use read .wav file function to see the plot, the signal is not distorted. However, when I play the wav file from my computer (which is rigged to an oscilloscope) it is so distorted that its unrecognizable

[Walter Roberson]

Star Strider did caution you about that.... http://www.mathworks.co.uk/matlabcentral/answers/44226#answer_54258