Electrical Communication - Active or Modifier-Type Telephone Transmitters

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Home Electroacoustic Devices Active or Modifier-Type Telephone Transmitters
See also: Passive or Generator-Type Telephone Transmitters

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Active or Modifier-Type Telephone Transmitters In active telephone transmitters the sound waves control an external source of power. For example, in the telephone set, the transmitter modifies the current flowing from a battery. Such transmitters are also amplifiers. The common telephone transmitter may deliver an electric power output 1000 times the magnitude of the acoustic power from the voice of the speaker.⁴ The power output of most modifier transmitters is accordingly many times greater than that of the generator type. Many types of modifier transmitters have been developed,⁵ including liquid transmitters,⁵ flame transmitters,⁵ glow transmitters,⁶ the ther-mophone,⁵ carbon-granule transmitters, and condenser transmitters. The last two are of much practical interest and will be discussed in detail.
Home Electroacoustic Devices Active or Modifier-Type Telephone Transmitters

Last Update: 2011-05-18