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Old 28th Mar 2012, 8:59 am   #11
crackle
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Join Date: Mar 2011
Location: Basildon, Essex, UK.
Posts: 4,100
Default Re: Radio 5 Live Echo (Empty Hall) Effect ?

Hi Dave
The tests I did were strictly speaking not an echo, it was a non repeating click of the same volume as the original click and this noticeably changed the sound of the click with more of what I would describe in audio terms as reverberation. I am only describing what I witnessed.
But it does prove that the ear can easily distinguish 2 sounds repeated in less than 5ms. It would have to in order to be able to hear up to 15kHz or more.
In real life a natural echo would be significantly quieter than the original sound and this may account for a major factor in being able to distinguish the echo with an extremely short delay of only a few 10’s of ms...
In the example the original poster gave, the 2 radio stations could have been received at approximately the same strength.
But I think this is academic as I think the answer is how you define an echo and as you have said the difference in the synchronisation of the transmitters.
Thanks
Mike
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