| Author |
Message |
KellyClarksonTV
Guest
|
 Posted:
Mon Nov 15, 2004 6:42 am Post subject:
Stereo Telephone Idea |
|
|
Couldn't the L-R channel be modulated on a higher frequency?
|
|
| Back to top |
|
 |
Karl Uppiano
Guest
|
| Posted:
Mon Nov 15, 2004 10:39 am Post subject:
Re: Stereo Telephone Idea |
|
|
"KellyClarksonTV" <kellyclarksontv@cs.com> wrote in message
news:20041114194200.06587.00000322@mb-m24.news.cs.com...
| Quote: | Couldn't the L-R channel be modulated on a higher frequency?
|
Yes, but it wouldn't save any bandwidth, so it would still be at least twice
as expensive as regular telephony, with no discernable advantage to the vast
majority of paying customers. There are plenty of services set aside for
transmitting stereo audio from place to place, but telephony ain't one of
them. |
|
| Back to top |
|
|
Aplin17
Guest
|
| Posted:
Thu Nov 18, 2004 9:05 am Post subject:
Re: Stereo Telephone Idea |
|
|
by the way is there any way to get back stereo information from mono audios?
|
|
| Back to top |
|
|
Karl Uppiano
Guest
|
| Posted:
Thu Nov 18, 2004 9:32 am Post subject:
Re: Stereo Telephone Idea |
|
|
"Aplin17" <aplin17@cs.com> wrote in message
news:20041117220532.06541.00000554@mb-m24.news.cs.com...
| Quote: | by the way is there any way to get back stereo information from mono
audios?
|
Not using standard multiplexing/demultiplexing technology. I suppose if you
had enough specific information about the original audio environment, and
enough computing power, you could theoretically use holographic-like
techniques to partially reconstruct a 3D sound image from a mono recording.
But if you're talking about recreating two discrete, statistically unrelated
channels that had been previously summed into one, the answer is not by any
means I'm aware of.
Of course, I read recently that Stephen Hawking is now postulating that
information may be read using quantum mechanical techniques, from matter
that has fallen into black holes, so perhaps I'm just not trying hard
enough. :-) |
|
| Back to top |
|
|
Aplin17
Guest
|
| Posted:
Thu Nov 18, 2004 8:00 pm Post subject:
Re: Stereo Telephone Idea |
|
|
that sucks ... a lot of historical recordings were done in mono and there's no
way to get stereo versions. |
|
| Back to top |
|
|
Aplin17
Guest
|
| Posted:
Thu Nov 18, 2004 8:02 pm Post subject:
Re: Stereo Telephone Idea |
|
|
But I heard it was possible to generate a Dolby 5.1 recording from a stereo
recording, what about that? |
|
| Back to top |
|
|
Karl Uppiano
Guest
|
| Posted:
Fri Nov 19, 2004 1:35 am Post subject:
Re: Stereo Telephone Idea |
|
|
"Aplin17" <aplin17@cs.com> wrote in message
news:20041118090226.06368.00000734@mb-m18.news.cs.com...
| Quote: | But I heard it was possible to generate a Dolby 5.1 recording from a
stereo
recording, what about that?
|
You can sometimes synthesize a sort of "surround sound illusion" using phase
information between the two stereo channels, but that's quite different from
restoring actual surround channel information. If you need true surround
sound, you need to record, store and reproduce the actual channels.
Information theory is quite specific on the bandwidth required for each
channel. There's no such thing as a free lunch.
It's true that properly recorded stereo sound contains spatial information.
But in that case, the two stereo speakers or stereo headphones are quite
sufficient to "decode" a 3D image. You don't need a 5.1 decoder. In fact,
binaural sound can be quite stunning. Binaural doesn't sound good over
speakers, though. See http://www.binaural.com/ or
http://www.noogenesis.com/binaural/binaural.html or just Google "binaural". |
|
| Back to top |
|
|
|
|
|
|
FAQ
Memberlist
Register
Profile
Log in to check your private messages
Log in