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The sensitivity pattern of a bidirectional microphone (red dot) viewed from above. In a moving-coil microphone, the diaphragm is attached to a light movable coil that generates a voltage as it moves back and forth between the poles of a permanent magnet. In ribbon microphones, a very thin light metal ribbon (usually corrugated) is suspended ...
In 1923, the first practical moving coil microphone was built. The Marconi-Sykes magnetophone, developed by Captain H. J. Round, became the standard for BBC studios in London. [17] [18] This was improved in 1930 by Alan Blumlein and Herbert Holman who released the HB1A and was the best standard of the day. [14]
The voice coil in moving coil drivers is suspended in a magnetic field provided by the loudspeaker magnet structure. As electric current flows through the voice coil (from an electronic amplifier), the magnetic field created by the coil reacts against the magnet's fixed field and moves the voice coil (and so the cone). Alternating current will ...
Working from a laboratory in Napa, California, they filed the first patent for a moving coil loudspeaker in 1911. [9] Four years later, in 1915, they built a dynamic loudspeaker with a 1-inch (2.5 cm) voice coil , a 3-inch (7.6 cm) corrugated diaphragm and a horn measuring 34 inches (86 cm) with a 22-inch (56 cm) aperture.
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Situational circumstances: Sometimes a microphone should not be visible, or having a microphone nearby is not appropriate. In scenes for a movie the microphone may be held above, out of the picture frame. Processing: If the signal is destined to be heavily processed, or mixed down, a different type of input may be required.
Bell Labs invented [citation needed] the condenser microphone in 1917, and this type of microphone went through many stages of improvement. Due to the invention of valve amplifiers, the production of simple moving coil mics like the Western Electric-designed 630A "8 Ball" became possible. This dynamic microphone went on to become one of the ...
Thus a 100 mm diameter voice coil, with a 12 mm winding height has similar power handling to a 50 mm diameter voice coil with a 24 mm winding height. In 'underhung' voice coil designs (see below), the coil is shorter than the magnetic gap, a topology that provides consistent electromotive force over a limited range of motion, known as X max.