A microphone in which the sound waves fall on a plate of Rochelle salt or similar material with piezoelectric properties, the variation in pressure being converted into a varying electric field by the piezoelectric effect.
A type of microphone containing a piezoelectric crystal in the form of two plates separated by an air gap (see diagram). Sound pressure variations cause displacements of the crystals and corresponding e.m.f.s are produced across them. Greater sensitivity is obtained using a separate diaphragm that is mechanically coupled to the centre of the crystal but this latter construction is more directive and has a poorer frequency response than the former.
Crystal microphone
- picosatellite
- Picosatellite for Remote-sensing and Innovative Space Missions
- pico-(symbol: p)
- Pico Veleta
- picrate
- picric acid
- picrite
- PICT
- Pict
- Pictet, Raoul Pierre
- pictogram
- Pictor
- picture
- picture carrier
- picture element
- picture processing
- picture theory of meaning
- P&ID
- PID
- PID control
- PID controller
- Pidgeon process
- pi diagram
- piecewise continuous
- piece-wise linear function