Moulton Laboratories
the art and science of sound


UK     Jan 03, 2013 05:51 AM
Wireless World did a lot of reporting in the early 50,s on hearing ability. Some reports showed that the human ears can detect a difference in arrival time of as little as 1micro second, which is how people can locate a sound source accurately. You might be interested in locating some of these articles and incorporating the findings into your excellent notes. Telephone companies used to test telephone microphones and earpieces in minute detail, using groups of listeners for intelligibility. This was done for at least 20 years to my knowledge. The results should be published in one of the telecommunications journals.

I would like to see an analysis of TV/DVD sound audio bandwidths(not sampling rates), as I am convinced by my ears that the received bandwidth can be extremely narrow and the sound highly distorted.


Geoff Duddridge
Geoff Duddridge 
france     Jul 13, 2013 06:01 AM
I don't speak very well english, hope you will not judge it.
I think a important point to note is both in analog and digital worlds, problemes occurs often in the highest limit of bandwith. It's true for distortion in an amp circuit or a loudspeaker. And It's true for a plug-in dealing with dynamics or wathever, feed it with a 44.1 signal flow and it will be less accurate in the 15-20kHz band. Perhaps the only interest in increasing the bitrate is pushing the distortion and algorithms inaccuraties out of the earing range ? The differences I ear betwen 44.1 and 88.2 or 96 signals is for me just because most problemes have moved to an inaudible spectrum range.
Best regards, you learn me a lot and you are always a reference when I search a way to do it better.
Dave Moulton
April 2000