Acoustic telegraphy
Acoustic telegraphy (also known as harmonic telegraphy) was a name for various methods of multiplexing (transmitting more than one) telegraph messages simultaneously over a single telegraph wire by using different audio frequencies or channels for each message. A telegrapher used a conventional Morse key to tap out the message in Morse code. The key pulses were transmitted as pulses of a specific audio frequency. At the receiving end a device tuned to the same frequency resonated to the pulses but not to others on the same wire.
Acoustic TelegraphAcoustic telegraphAlexander_Graham_BellAnalogue filterBritish and Irish Magnetic Telegraph CompanyElisha GrayElisha Gray and Alexander Bell telephone controversyEqualization (audio)Etheric forceFrequency-division multiplexingGardiner Greene HubbardGeorge May PhelpsHarmonic telegraphHarmonic telegraphyHermann von HelmholtzHistory of telecommunicationHistory of the telephoneMechanical filterMultiplexingTelegraphyTimeline of the telephone
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Acoustic telegraphy
Acoustic telegraphy (also known as harmonic telegraphy) was a name for various methods of multiplexing (transmitting more than one) telegraph messages simultaneously over a single telegraph wire by using different audio frequencies or channels for each message. A telegrapher used a conventional Morse key to tap out the message in Morse code. The key pulses were transmitted as pulses of a specific audio frequency. At the receiving end a device tuned to the same frequency resonated to the pulses but not to others on the same wire.
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Acoustic telegraphy (also know ...... ctrically over long distances.
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Als akustische Telegrafie (auc ...... egrafenleitung zu übermitteln.
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La telegrafia harmònica (també ...... duir a l'invenció del telèfon.
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Se denomina telegrafía armónic ...... telegráfico, condujeron al .
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Acoustic telegraphy (also know ...... ot to others on the same wire.
@en
Als akustische Telegrafie (auc ...... egrafenleitung zu übermitteln.
@de
La telegrafia harmònica (també ...... st procediment de transmissió.
@ca
Se denomina telegrafía armónic ...... procedimiento de transmisión.
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Acoustic telegraphy
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Akustische Telegrafie
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Telegrafia harmònica
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Telegrafía armónica
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