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Message Digest
Volume 29 : Issue 12 : "text" Format
Messages in this Issue:
Re: AT&T asking FCC for "end date" of switched network..
Re: AT&T asking FCC for "end date" of switched network..
Magneto Telephone
Re: MagicJack for Cellular phone
speech clippings, was: AT&T asking FCC ....
Re: MagicJack for Cellular phone
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Date: Mon, 11 Jan 2010 06:29:22 -0600
From: rpw3@rpw3.org (Rob Warnock)
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: AT&T asking FCC for "end date" of switched network..
Message-ID: <P9OdnZ1TPJg_hNbWnZ2dnUVZ_v2dnZ2d@speakeasy.net>
Eric Tappert <e.tappert.spamnot@worldnet.att.net> wrote:
+---------------
| BTW, voice detectors have an "attack time", so often the first part
| of a syllable is clipped, reducing the quality of the connection.
+---------------
Though note that digital voice detectors are capable of storing a
FIFO's worth of samples from before the "on" decision is made and
can include those in the outgoing stream ... at the cost of delaying
the entire "on" period by that much [that is, by the attack time of
the detector]. While increasing end-to-end delay is never desirable,
increasing it by just enough to restore the clipped portion is
probably worth it.
-Rob
Rob Warnock <rpw3@rpw3.org>
627 26th Avenue <http://rpw3.org/>
San Mateo, CA 94403 (650)572-2607
Date: 12 Jan 2010 01:16:33 -0000
From: John Levine <johnl@iecc.com>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: AT&T asking FCC for "end date" of switched network..
Message-ID: <20100112011633.69708.qmail@simone.iecc.com>
>| BTW, voice detectors have an "attack time", so often the first part
>| of a syllable is clipped, reducing the quality of the connection.
>
>Though note that digital voice detectors are capable of storing a
>FIFO's worth of samples from before the "on" decision is made and
>can include those in the outgoing stream ... at the cost of delaying
>the entire "on" period by that much [that is, by the attack time of
>the detector].
Why not just speed up the first second or two of the "on" period until
it gets back to real time? That should be well within the capability
of modern DSPs. Don't raise the pitch, just throw away every Nth
sample, analogous to the way they used to use rotating tape heads.
R's,
John
Date: Mon, 11 Jan 2010 00:56:01 +0530
From: Prabhudev Prakash <telereach2006@gmail.com>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Magneto Telephone
Message-ID: <3d9a09fe1001101126k16cea6exf2cf613116a759ee@mail.gmail.com>
Dear Sir,
I came across an entry dated 10-09-2008 wherein you were discussing the
availability of newly made magneto telephones.
I appreciate your broad area of interest in the telecom field, covering even
magneto telephones.
My company has made and supplied over 50,000 magneto telephones to various
critical areas, especially railway locations.
For many years we have been envisaging that the production rate, though
moderate, may soon have to be tapered off. But the requirement is still
quite steady.
Our present production model is the M-12. A pdf of the same is attached for
your information.
With best regards,
Prabhudev Prakash
***** Moderator's Note *****
Prabhudev Prakash's email is such a refreshing change from the usual
glut of "stealth" ads that I'm going to break a rule and put it
out. Of course, there are special circumstances:
1. The market for magneto telephones is obviously small.
2. There is ample competition in the market, especially from surplus
military "field" telephones.
I've moved the sales leaflet to -
http://telecom-digest.org/M-12%20Magneto%20Leaflet%206-7-08.pdf .
Bill Horne
Moderator
P.S. I'm not involved, I get no money from this, etc. Caveat emptor
and all that.
Date: Mon, 11 Jan 2010 11:02:48 -0800
From: AES <siegman@stanford.edu>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: MagicJack for Cellular phone
Message-ID: <siegman-6B9F83.11021811012010@news.stanford.edu>
In article <d8P1n.1299$Mv3.1031@newsfe05.iad>,
Sam Spade <sam@coldmail.com> wrote:
> This will really benefit me. I live at the very south end of the
> greater Los Angeles wireless area, whatever those are officially
> called. I am in a concrete building that faces south two miles from
> the San Diego county line. The towers in the LA service area are a
> couple miles north, thus blocked completely by our building. The
> first tower in the San Diego area is about 10 miles away, so it
> doesn't work even though our big windows face it.
>
Depending on what cellular service and Internet service you have, and
whether you're willing to invest approx $200, a femtocell could possibly
be a good solution for you.
[From a recent convert, in a similar situation.]
Date: Mon, 11 Jan 2010 19:19:07 +0000 (UTC)
From: danny burstein <dannyb@panix.com>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: speech clippings, was: AT&T asking FCC ....
Message-ID: <hiftja$pmo$2@reader1.panix.com>
In <P9OdnZ1TPJg_hNbWnZ2dnUVZ_v2dnZ2d@speakeasy.net> rpw3@rpw3.org (Rob Warnock) writes:
>Eric Tappert <e.tappert.spamnot@worldnet.att.net> wrote:
>+---------------
>| BTW, voice detectors have an "attack time", so often the first part
>| of a syllable is clipped, reducing the quality of the connection.
>+---------------
>Though note that digital voice detectors are capable of storing a
>FIFO's worth of samples from before the "on" decision is made and
>can include those in the outgoing stream ... at the cost of delaying
>the entire "on" period by that much [that is, by the attack time of
>the detector]. While increasing end-to-end delay is never desirable,
>increasing it by just enough to restore the clipped portion is
>probably worth it.
And a really, really, "smart" system of this sort would buffer that
first 1/4 or so second, feed it out (as you described) as part of the
delayed stream, and then...
... and then, "speed up" the next few seconds of output until it
catches up with the speaker's "real time". [a]
[a] There are numerous ways of taking a voice stream and reducing the
time length. This is done by, for example, radio stations to cut a
25 minute (say...) interview or talk fest down to 20 minutes, thus
letting them pump in more commercials.
For better or worse, Rush Limbaugh was the most vocal, so to
speak, opponent of this and he got the stations to stop playing
with his broadcasts.
--
_____________________________________________________
Knowledge may be power, but communications is the key
dannyb@panix.com
[to foil spammers, my address has been double rot-13 encoded]
Date: Mon, 11 Jan 2010 11:09:46 -0800
From: AES <siegman@stanford.edu>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: MagicJack for Cellular phone
Message-ID: <siegman-54C6AB.11091611012010@news.stanford.edu>
In article <4b488e90$0$65838$892e0abb@auth.newsreader.octanews.com>,
"GlowingBlueMist" <GlowingBlueMist@truely.invalid> wrote:
>
> Sounds much like a clone of the Verizon femtocell unit (officially known as
> a "Verizon Wireless Network Extender") that people have been talking about
> elsewhere in the newsgroup.
>
> If Verizon can do it "legally" there is no reason someone else can not do
> the same thing provided they don't step on someone else's patents, but then
> again phone companies seem to hate competition from startup companies.
> Especially if the competitors product actually works.
>
> ***** Moderator's Note *****
>
> The problem is that it's NOT the same thing as a Verizon femtocell:
> it is, as another reader pointed out, only a way to turn a cell phone
> into a cordless phone. The Verizon offering gives customers access to
> their regular cellphone features, such as voicemail, but the proposed
> MagicJack product does not.
As best I understand the situation (not an expert), I agree it's NOT
the same. To have a Verizon femtocell, you have to have a full-bore
Verizon cellphone account, and a Verizon cellphone that talks to that
account through a regular tower when it's near one, and through your
little femtocell tower when it's the closest/strongest "tower".
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End of The Telecom digest (6 messages)
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