Re: [IRCA] Another Boston Acoustics Receptor HD Radio Review

["CHARLES HUTTON" <charlesh3@xxxxxxx>]

There's a decent chance the codec does indeed try to plug the hole with the 
last good sample or an extrapolation.

Lots of common audio codecs now do this, including the venerable G.711 of 
telephone networks, G.729 of VoIP fame, G.728, etc. The usual trigger for 
this is when the error correction sees a frame that is so bad it can't 
correct it andthrows up its hands. It's then a simple matter to copy the 
last good frame and apply any tailoring you wish.

I don't have direct knowledge of whether iBiquity is using this so-called 
"error concealment".

End of engineering gobbledygook.


Chuck

>From: "Bob Foxworth" <rfoxwor1@xxxxxxxxxxxxxxx>
>Reply-To: Mailing list for the International Radio Club of 
>America<irca@xxxxxxxxxxxxxxxx>
>To: <ABDX@xxxxxxxxxxxxxxx>,        "Mailing list for the International 
>Radio Club of America"<irca@xxxxxxxxxxxxxxxx>
>Subject: Re: [IRCA] Another Boston Acoustics Receptor HD Radio Review
>Date: Tue, 28 Feb 2006 17:50:46 -0500
>I have to go out on a limb and guess that one of the
>issues with static being a problem on AM is the
>possibility that long duration impulse noise, which
>is wide with respect to the digital bit stream, is
>punching holes in the digital data stream, and causing
>momentary dropouts. I have no idea how the receiver
>would behaves in this circumstance. I would guess
>that the impulse noise is somewhat stronger than the
>desired bit stream. I am pretty sure that the receiver
>is not sophisticated enough to replace the missing bit
>stream with an analogue of the recovered data that
>came just before it, and that which was cleanly decoded.
>
>
>- Bob
>


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