BSO on the radio - not for me anymore

Thu Oct 14 15:31:55 EDT 2010

All of your bit rates are expressed in kB/s (the B is capitalized).
The capitalized B means the abbreviation stands for bytes/sec, not
bits/sec--a difference of approximately a decimal order of magniture.
(When you include the overhead, 1 kB/s is very close to 10 kb/s.)
However, I believe that you mean bits/sec. If so, the b should be
lower case. Better yet, spell out bits and bytes in all referencees to
data rates; the extra work is minimal and you eliminate the confusion.

Dan Strassberg (
eFax 1-707-215-6367

----- Original Message ----- 
From: "Bob DeMattia" <>
To: "boston Radio Interest" <>;
"George Allen" <>
Sent: Thursday, October 14, 2010 12:54 PM
Subject: Re: BSO on the radio - not for me anymore

> *is HD2 the same or lower quality [bitrate] than HD1?  Or will that
> vary
> depending on the station [WGBH in this case]?*
> It depends on how the station wants to divide up the available
> bandwidth.
> Hybrid HD offers
> 100 - 150 kB/s which must be divided amongst the subchannels.
> WGBH has three subchannels.  The HD3 rebroadcast of WCAI is
> news/talk, so
> they are probably using a small
> bit rate there (this is also why you see AM simulcasts like WBZ on
> 98.5 and
> WEEI on 93.7 on the third subchannel).
> Assuming they use an AM-quality bit rate (12 kB) for this one, that
> leaves
> them with
> 80 - 138 kB to split amongst the two remaining channels.  Ibiquity
> considers
> 100kB to be CD quality and 50kB
> to be FM quality.  So you could have two better-than-FM subchannels,
> or one
> CD-quality subchannel and one
> sub-par subchannel.
> Maybe you can call the station and ask.  I imagine some better
> quality HD
> receivers may also indicate the
> bit rate of the received channel (I don't have one of these).
> -Bob

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