A displacement receiver is a device that responds to or is sensitive to directed distance (displacement).
Examples of displacement receivers include
carbon microphone
The carbon microphone, also known as carbon button microphone, button microphone, or carbon transmitter, is a type of microphone, a transducer that converts sound to an electrical audio signal. It consists of two metal plates separated by gra ...
s,
strain gauge
A strain gauge (also spelled strain gage) is a device used to measure strain on an object. Invented by Edward E. Simmons and Arthur C. Ruge in 1938, the most common type of strain gauge consists of an insulating flexible backing which supports ...
s, and
pressure sensors or force sensors, which, to within an appropriate scale factor, respond to distance.
In music, certain music keyboards can be considered displacement receivers in the sense that they respond to displacement, rather than velocity (as is more commonly the case).
Examples of displacement-responding sensors include the mechanical action of
tracker organs, as well as the force-sensing resistors found in
music keyboards that had
polyphonic aftertouch capability. Polyphonic aftertouch is no longer a feature of presently manufactured keyboards, but certain older models such as the
Roland
Roland (; frk, *Hrōþiland; lat-med, Hruodlandus or ''Rotholandus''; it, Orlando or ''Rolando''; died 15 August 778) was a Frankish military leader under Charlemagne who became one of the principal figures in the literary cycle known as the ...
A50 featured a pressure sensing resistor, similar in principle-of-operation to a carbon microphone, in each key.
Transducers
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