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General Vintage Technology Discussions For general discussions about vintage radio and other vintage electronics etc. |
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12th Feb 2019, 9:07 pm | #1 |
Tetrode
Join Date: Aug 2018
Location: Glasgow, Scotland, UK.
Posts: 55
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Audio phase correction
I encountered in an old thread the term 'audio phase correction' in relation to AM radio. Could someone tell me (in not too technical terms) what this is about? Thanks
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12th Feb 2019, 9:24 pm | #2 |
Rest in Peace
Join Date: Jul 2011
Location: Bridgnorth, Shropshire, UK.
Posts: 787
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Re: Audio phase correction
Hi Scott,
Not sure if what I'm thinking is relevant but I've heard that, prior to transmission, the audio is often subjected to all pass (i.e. phase only) filtering. The aim is to smear the frequency components of transients so that they attain a lower peak while sounding the same. It's corruption really, but it enables a higher apparent modulation. |
13th Feb 2019, 9:30 am | #3 |
Tetrode
Join Date: Aug 2018
Location: Glasgow, Scotland, UK.
Posts: 55
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Re: Audio phase correction
Thanks, but what I was thinking of is where several transmitters share the same frequency, as a way of reducing problems in so-called mush areas.
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13th Feb 2019, 10:10 am | #4 |
Nonode
Join Date: Mar 2010
Location: Dukinfield, Cheshire, UK.
Posts: 2,033
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Re: Audio phase correction
There have been several threads concerning the effects of transmitters radiating the same content on the same frequency. Try a search for 'mush zone', synchronised transmitters etc. I'm sure something will pop up.
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Andy G1HBE. |
13th Feb 2019, 12:26 pm | #5 |
Nonode
Join Date: Mar 2010
Location: Dukinfield, Cheshire, UK.
Posts: 2,033
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Re: Audio phase correction
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Andy G1HBE. |