Online Pitch source

[Kerry Cooper]

Robert,

I get less delay using the Skype then using the telephone. I can telephone
the USA with Skype and it is like they are in the next street, where as when
using the normal telephone, there is a delay.

After using the sound source from NTIS I check it with a known source . It
was spot on. I am using Cable broadband, does that make a difference?


Kerry Cooper
 
Kerry Cooper 
Australasian Registered Piano Technician (ARPT)
Brisbane Piano Centre
(07)3809-0652
0412-033-379
brispiano at optushome.com.au
-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Robert Scott
Sent: Monday, 15 May 2006 11:39 PM
To: pianotech at ptg.org
Subject: RE: Online Pitch source

Kerry Cooper suggested:

> Download Skype (VOIP) pay 10 euro's and dial +13034997111 and it will come
> through your speakers.

Unfortunately this is no better than playing a WAV file on your computer.
The VOIP method of accessing the telephone network introduces variable
network delays that make it necessary to reassemble the sound at the
receiving end according to the time-base in your computer.  The pitch of the
NIST tones will be distorted.  The VOIP protocol uses long-term rate
adjustment strategies to keep the data buffers from overrunning, but over
the short term, the playback rate is not guaranteed to be the same as the
recording rate.

Robert Scott
Ypsilanti, Michigan





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