Now we see the result when a hydrophone signal is constructed with the same rate of bubble generation (50 per second), but the computer adds random noise similar to that which would be encountered in nature.  The result sounds a little more like rain or a babbling book (click on the loudspeaker). To listen to the 2-second recording, click here. You should be able to clearly here at the high amplitude, low-frequency signal from a large bubble near the beginning of the recording (labelled A).