Re: walkie-talkie use within city limits

On 12/5/06 5:05 AM, in article C8edh.296$Gr2.42@xxxxxxxxxxxxxxxxxxxxxxxxxx,
"joseph2k" <quiettechblue@xxxxxxxxx> wrote:

Don Bowey wrote:

On 12/1/06 2:20 AM, in article 4tadvoF139672U2@xxxxxxxxxxxxxxxxxx, "Dirk
Bruere at NeoPax" <dirk.bruere@xxxxxxxxx> wrote:

Joel Kolstad wrote:
"Dirk Bruere at NeoPax" <dirk.bruere@xxxxxxxxx> wrote in message
news:4t99n1F12d7f0U1@xxxxxxxxxxxxxxxxxxxxx
So when are we going to get WiFi enabled mobile phones that can use
Skype when they latch onto an open network?

You can already do that with Windows Mobile phones and, I would guess,
Palm OS-powered phones.

That being said, Skype is a great example of where a drop in quality is
acceptable when the price is right (free).


Drop in quality?!
Surely you are joking?
Listen to this test recording I made.
http://www.neopax.com/test/skypetest.mp3

That recording is of a one-ended (broadcast?) conversation, not of a
conversation of two people, each on one end of a circuit. As such, what
is missing is the time delay between the time a sound is uttered and the
time it would be coded, sent, and then received at the other end of the
circuit.

Your recording does not contain the echo that exists on low bit-rate
encoded

Telecommunications Echo is a hardline physical manifestation due to
impedance irregularities. See Time Domain Reflectometry (TDR). Once the
signal is digitized the concept of echo mutates wildly. Actually, the
concept of irregular delay is more appropriate.

Your post is an amateurish explanation for echo.

Most increased, telco long haul, echo is caused by their having changed over
to fiber transmission, which has greater delay than microwave and wire-line
transmission. In private networks, and most non-telco voip, the low
bit-rate coding processes introduce noticeable delay all by itself.

Don



systems. If you have ever experienced a Network echo-canceller failure on
a cellphone call you will know how badly the call is degraded.

The free part of Skype is good; the quality is fair, but not as good as
the Public network 56/64 kbit/s coded calls.

Don

.

Relevant Pages

  • Re: walkie-talkie use within city limits
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