non electric signal is converted into electrical signal by transduction.
non electric signal is converted into electrical signal by?
transduction
during his summer vacation at the homestead in 1874, alexander graham continued to contemplate electrical sound reproduction while viewing the undulating surface of the grand river from his "dreaming place". he postulated that "it would be possible to transmit sounds of any sort" by the continuous variation of the intensity of the electric current. this method of sound energy to electrical signal transduction was fundamentally different from the on-or-off transmission methods used by other telephone experimenters. alexander graham held lengthy discussions with his father explaining what he thought he could achieve with a sound-driven transmitter producing an electrical signal which would instantaneously travel an electrical circuit to a receiver at another location where it would be converted back to sound. his record of a discussion with his father in their home's living room, wrote "if i could vary the intensity of the electric current in exact proportion to the variation of the air density in the production of words, i would be able to transmit speech by telegraph" (using the telephone's technical analog, the "telegraph", as the former name had not yet been adapted). on 26 july 1874 in their living room the younger bell realized the technical principles of telephony, inventing the telecommunications device he is now closely identified with. returning again to the homestead the next summer in 1875 bell wrote his first draft specifications of the telephone patent—commonly considered to be the most valuable patent in history—that september. he later built his first fully functional unit at boston on march 10, 1876. later that year, in august, bell made the first successful voice transmission of any notable distance, between brantford and paris ontario.
bell homestead national historic site
bullet::::- potentiometers (when used for measuring position)





























bullet::::- pressure sensors





























bullet::::- string potentiometers





























bullet::::- tactile sensors





























bullet::::- vibration powered generators





























bullet::::- vibrating structure gyroscopes





























bullet::::- electroacoustic:





























bullet::::- loudspeakers, earphones – converts electrical signals into sound (amplified signal → magnetic field → motion → air pressure)





























bullet::::- microphones – converts sound into an electrical signal (air pressure → motion of conductor/coil → magnetic field → electrical signal)





























bullet::::- pickup (music technology) – converts motion of metal strings into an electrical signal (magnetism → electrical signal)





























bullet::::- tactile transducers – converts electrical signal into vibration ( electrical signal → vibration)
transducer