Reverse sound at speeds past the sound barrier?

Question

If someone or something was sitting in front of (not below, behind or beside) an object approaching them at speeds higher than the speed of sound, would the sound they hear be reversed and slowed down? Would the sound they hear begin when the object passes them and continue in slowed-reverse until it fades out?

Answer 1

From directly in front, they would not hear anything until the sound reaches them (as the object reaches them).

But yes, if the object had been increasing in pitch, the person would hear a sound that went down in pitch.

The actual pitch involved would still be modified by the doppler effect, of course.

Answer 2

You don't hear a thing, until the object passes. Then you hear a boom (sonic boom). After that you hear the roar of an engine fading in the distance (because anything pushing past the sound barrier is going to be making a lot of engine noise). Nothing would cause reversed sound, unless something was going so fast it messed with time.

Answer 3

sadly, no - the sonic growth is led to via the displacement of air via the plane. So interior the plane you're basically shifting relative to the air interior with you, quite than the air exterior.