24 Facts About Dynamic microphone

Several types of Dynamic microphone are used today, which employ different methods to convert the air pressure variations of a sound wave to an electrical signal.

The Berliner Dynamic microphone found commercial success through the use by Alexander Graham Bell for his telephone and Berliner became employed by Bell.

Also in 1923, the ribbon microphone was introduced, another electromagnetic type, believed to have been developed by Harry F Olson, who essentially reverse-engineered a ribbon speaker.

In most cases, the electronics in the Dynamic microphone itself contribute no voltage gain as the voltage differential is quite significant, up to several volts for high sound levels.

An electret Dynamic microphone is a type of condenser Dynamic microphone invented by Gerhard Sessler and Jim West at Bell laboratories in 1962.

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The externally applied charge used for a conventional condenser Dynamic microphone is replaced by a permanent charge in an electret material.

Valve Dynamic microphone is a condenser Dynamic microphone that uses a vacuum tube amplifier.

The classic RCA Type 77-DX Dynamic microphone has several externally adjustable positions of the internal baffle, allowing the selection of several response patterns ranging from "figure-eight" to "unidirectional".

Some new modern ribbon microphone designs incorporate a preamplifier and, therefore, do require phantom power, and circuits of modern passive ribbon microphones, i e, those without the aforementioned preamplifier, are specifically designed to resist damage to the ribbon and transformer by phantom power.

The high impedance of the crystal Dynamic microphone made it very susceptible to handling noise, both from the Dynamic microphone itself and from the connecting cable.

New type of laser Dynamic microphone is a device that uses a laser beam and smoke or vapor to detect sound vibrations in free air.

Reciprocity applies, so the resulting Dynamic microphone has the same impairments as a single-driver loudspeaker: limited low- and high-end frequency response, poorly-controlled directivity, and low sensitivity.

Inner elements of a Dynamic microphone are the primary source of differences in directivity.

How the physical body of the Dynamic microphone is oriented relative to the diagrams depends on the Dynamic microphone design.

Some Dynamic microphone designs combine several principles in creating the desired polar pattern.

An omnidirectional Dynamic microphone's response is generally considered to be a perfect sphere in three dimensions.

The body of the Dynamic microphone is not infinitely small and, as a consequence, it tends to get in its own way with respect to sounds arriving from the rear, causing a slight flattening of the polar response.

Therefore, the smallest diameter Dynamic microphone gives the best omnidirectional characteristics at high frequencies.

Unidirectional Dynamic microphone is primarily sensitive to sounds from only one direction.

Typical uses of this Dynamic microphone, which has unusually focused front sensitivity and can pick up sounds from many meters away, include nature recording, outdoor sporting events, eavesdropping, law enforcement, and even espionage.

Noise-canceling Dynamic microphone is a highly directional design intended for noisy environments.

Maximum SPL the Dynamic microphone can accept is measured for particular values of total harmonic distortion, typically 0.

Dynamic range of a microphone is the difference in SPL between the noise floor and the maximum SPL.

All Dynamic microphone calibration is ultimately traceable to primary standards at a national measurement institute such as NPL in the UK, PTB in Germany and NIST in the United States, which most commonly calibrate using the reciprocity primary standard.