Actionscript 3 :: Generate An X Second Silence Audio File With ByteArray And Adobe Air

I would like to generate a sound in Adobe Air using ByteArray. The sound should be a silence of x seconds. I found this code that I am using to generate the bytes:

private function encode(data : ByteArray) : ByteArray
{
var channels : uint = 2;
var bits : uint = 16;

[Code].....

But when I save the file using Filereference and import it into a flash file I get an error message saying that there were problem reading the file.