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Stereophonic sound:


Well-Known Member
I thought this was kinda interesting, but long. http://en.wikipedia.org/wiki/Stereophonic_sound

The below paragraphs describe what must be the original audio streaming, pretty cool that they had that technology that long ago kind of like SteamPunk/Pandora.

Diagram of Clément Ader's théatrophone prototype at the Opera during the World Exhibition in Paris (1881).

Clément Ader demonstrated the first two-channel audio system in Paris in 1881, with a series of telephone transmitters connected from the stage of the Paris Opera to a suite of rooms at the Paris Electrical Exhibition, where listeners could hear a live transmission of performances through receivers for each ear. Scientific American reported,

"Every one who has been fortunate enough to hear the telephones at the Palais de l'Industrie has remarked that, in listening with both ears at the two telephones, the sound takes a special character of relief and localization which a single receiver cannot produce… This phenomenon is very curious, it approximates to the theory of binauricular audition, and has never been applied, we believe, before to produce this remarkable illusion to which may almost be given the name of auditive perspective."[3]

This two-channel telephonic process was commercialized in France from 1890 to 1932 as the Théâtrophone, and in England from 1895 to 1925 as the Electrophone. Both were services available by coin-operated receivers at hotels and cafés, or by subscription to private homes.[4]


Well-Known Member
Kind of gives perspective to read about the old stuff. I like to study the history of audio, and have found that there are really very few "new" things in audio which weren't known about long, long ago. In the 1930s, AM radio was tested which had bandwidth to 15kHz. WW II really put the lid on a lot of development in consumer audio (and television for that matter), and after the war things like Hi-Fi really took off again.


Well-Known Member
Early 3 channel dolby uses a similiar design as the MS recording. The third channel is placed using the Side recording. I have been using this with some of my recordings with some success.

Fun to have the side microphone in the rear of the room getting ambience and crowd noise for a live recording.