second repetition of the programmed pulse train. >> what do you mean by the shape of the pulses? >> well, the -- the pulse may be constant throughout its cycle. or it may vary. it may increase. it may decrease. and all of this would be identifiable and, again, something that you could compare. >> what are we looking at there? is that the shape of the pulse signals? >> okay. that's an example that i put together. it's not a real pinger. but it's to show you that we have one second intervals and for each second, i have .2 second pulse within the one second. i don't know whether they have the audio wave sound that i produced. >> we'll have it for you a little bit later on this hour. yeah. >> okay. finally, the amplitude that is the strength. >> amplitude of received pulses. >> right. the strength of the received