Acoustic Telegraph

Acoustic Telegraph

The Acoustic Telegraph was a method for multiplexing (transmitting more than one) signal on a single telegraph wire. It used signals at different acoustic frequencies. A telegrapher used a conventional Morse key to tap out the message, the key pulses being sent as pulses of a specific frequency. At the receiving end a device tuned to one frequency resonated to the pulses but not to others on the same wire.

Inventors who worked on the acoustic telegraph included Thomas Edison, Elisha Gray and Alexander Graham Bell.


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  • Acoustic telegraph — Telegraph Tel e*graph, n. [Gr. ? far, far off (cf. Lith. toli) + graph: cf. F. t[ e]l[ e]graphe. See {Graphic}.] An apparatus, or a process, for communicating intelligence rapidly between distant points, especially by means of preconcerted… …   The Collaborative International Dictionary of English

  • Acoustic telegraph — Acoustic A*cous tic (#; 277), a. [F. acoustique, Gr. ? relating to hearing, fr. ? to hear.] Pertaining to the sense of hearing, the organs of hearing, or the science of sounds; auditory. [1913 Webster] {Acoustic duct}, the auditory duct, or… …   The Collaborative International Dictionary of English

  • Acoustic telegraphy — was also known as harmonic telegraphy. During the 1800s inventors tried to find ways of sending multiple telegraph messages simultaneously over a single telegraph wire by using different audio frequencies for each message. These inventors… …   Wikipedia

  • Telegraph — Tel e*graph, n. [Gr. ? far, far off (cf. Lith. toli) + graph: cf. F. t[ e]l[ e]graphe. See {Graphic}.] An apparatus, or a process, for communicating intelligence rapidly between distant points, especially by means of preconcerted visible or… …   The Collaborative International Dictionary of English

  • Telegraph cable — Telegraph Tel e*graph, n. [Gr. ? far, far off (cf. Lith. toli) + graph: cf. F. t[ e]l[ e]graphe. See {Graphic}.] An apparatus, or a process, for communicating intelligence rapidly between distant points, especially by means of preconcerted… …   The Collaborative International Dictionary of English

  • Acoustic — A*cous tic (#; 277), a. [F. acoustique, Gr. ? relating to hearing, fr. ? to hear.] Pertaining to the sense of hearing, the organs of hearing, or the science of sounds; auditory. [1913 Webster] {Acoustic duct}, the auditory duct, or external… …   The Collaborative International Dictionary of English

  • Acoustic duct — Acoustic A*cous tic (#; 277), a. [F. acoustique, Gr. ? relating to hearing, fr. ? to hear.] Pertaining to the sense of hearing, the organs of hearing, or the science of sounds; auditory. [1913 Webster] {Acoustic duct}, the auditory duct, or… …   The Collaborative International Dictionary of English

  • Acoustic vessels — Acoustic A*cous tic (#; 277), a. [F. acoustique, Gr. ? relating to hearing, fr. ? to hear.] Pertaining to the sense of hearing, the organs of hearing, or the science of sounds; auditory. [1913 Webster] {Acoustic duct}, the auditory duct, or… …   The Collaborative International Dictionary of English

  • Acoustic enhancement — is a subtle type of sound reinforcement system used to augment direct, reflected, or reverberant sound. While sound reinforcement systems are usually used to increase the sound level of the sound source (like a person speaking into a microphone,… …   Wikipedia

  • Acoustic Kitty — was a CIA project launched by the Directorate of Science Technology in the 1960s attempting to use cats in spy missions, intended to spy on the Kremlin, and Soviet embassies. A battery and a microphone were implanted into a cat and an antenna… …   Wikipedia

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