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Thursday, April 25, 03:44:58pm [ Login ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1, 2, 3, 4, 5, [6] ]

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Date Posted: Friday, December 16, 05:43:31pm
Author: Gus Katsoris
Subject: Re: HD Radio Future Comes to New York City
In reply to: Steve Green 's message, "Re: HD Radio Future Comes to New York City" on Thursday, December 15, 07:19:08pm

I know I that this explanation my be a bit oversimplified, but here it goes:
The HD signal is not a subcarrier but an 'overlay'. It exists in the guard bands on either side of the main signal (the signal being the carrier, modulation sidebands and all subcarriers and pilot signals). The plan os to occupy the space which is unused up to the limit of the FCC authorized channel bandwidth. A technique called OFDM is used in a clever way to stay within the channel "mask".

There is an excellent article about HD FM (also called IBOC-FM) at this website:

www.findarticles.com/p/articles/mi_m0OUK/is_2_10/ai_113061832

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