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Stereo Telephone Idea

Discussion in 'General Electronics' started by KellyClarksonTV, Nov 15, 2004.

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  1. Couldn't the L-R channel be modulated on a higher frequency?
     
  2. Karl Uppiano

    Karl Uppiano Guest

    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.
     
  3. Aplin17

    Aplin17 Guest

    by the way is there any way to get back stereo information from mono audios?
     
  4. Karl Uppiano

    Karl Uppiano Guest

    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. :)
     
  5. Aplin17

    Aplin17 Guest

    that sucks ... a lot of historical recordings were done in mono and there's no
    way to get stereo versions.
     
  6. Aplin17

    Aplin17 Guest

    But I heard it was possible to generate a Dolby 5.1 recording from a stereo
    recording, what about that?
     
  7. Karl Uppiano

    Karl Uppiano Guest

    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".
     
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