It's peculiar and rather different from others used before
I can't say wether it is realistic or not, but it does sound a bit "short" to me?
The main problem I see, is that the fact that an escort is pinging around doesn't mean the beam is trained at you and giving him a return
And your sound is just the one from the return, not from the emission. The PING heard in movies is more or less representative of what you hear if a ship is pinging near you. But if that ping hits you, then you would also "hear-feel" the actual sound wave impact, and that is what your own PINg reflects.
I wonder if the best idea would be to swap the soundman voice for "The enemy has us in his beam" (Or whatever is said when voices are in english, I just play with german ones) for your ping return, and leave the original ASDIC emission as it is. That way, you would clearly hear when the enemy is hitting you, not just when he is emitting.