1993-11-01 - Secure Phone Progress (fwd)

Header Data

From: “Alan (Gesture Man) Wexelblat” <wex@media.mit.edu>
To: mg5n+@andrew.cmu.edu
Message Hash: 71db0f017784fceeffc4b6537b8d2ce0e85ce4222a7b706f59d7f2bab0b3bda1
Message ID: <9311011654.AA23855@media.mit.edu>
Reply To: <0gp7NE600awUQ5lkYP@andrew.cmu.edu>
UTC Datetime: 1993-11-01 19:43:49 UTC
Raw Date: Mon, 1 Nov 93 11:43:49 PST

Raw message

From: "Alan (Gesture Man) Wexelblat" <wex@media.mit.edu>
Date: Mon, 1 Nov 93 11:43:49 PST
To: mg5n+@andrew.cmu.edu
Subject: Secure Phone Progress (fwd)
In-Reply-To: <0gp7NE600awUQ5lkYP@andrew.cmu.edu>
Message-ID: <9311011654.AA23855@media.mit.edu>
MIME-Version: 1.0
Content-Type: text/plain

Well, keep in mind that the phone doesn't transmit nearly all of the
spectrum of hearing.  In fact it doesn't transmit anything above about
3.5KHz, so you don't have to have enough bandwidth for the human 20Khz
hearing range if all you're doing is emulating today's voice phone

This, btw, is why it's hard to identify speakers over the phone even in a
noise-free transmission -- the acoustical signal is just plain impoverished.

--Alan Wexelblat, Reality Hacker, Author, and Cyberspace Bard
Media Lab - Advanced Human Interface Group	wex@media.mit.edu
Voice: 617-258-9168, Pager: 617-945-1842	PUBLIC KEY available by request
Try not to have a good time ... This is supposed to be educational.