AVIXA CTS-D: Microphones Questions With Answers Graded A+ Assured Success

Electret Microphone - A type of condenser microphone. It has prepolarized material which is applied to the microphone's diaphragm or backplate. This provides a permanent, fixed charge for one side of the capacitor configuration. This permanent charge eliminates the need for the higher voltage required for powering the typical condenser microphone, so it can be powered using small batteries and normal phantom power. Lavalier Microphone (lav /lapel) - It is a small microphone designed to be worn either around the neck or clipped to apparel. Can be attached directly to clothing, such as a necktie or lapel. Typically an electret type mic. Types of Microphones - 1. Handheld 2. Instrument 3. Lavalier 4. Head 5. Gooseneck 6. Boundary 7. PZM Microphone 8. Shotgun 9. Handheld Microphones - Used mainly for speech or singing. Since it is constantly moved about it includes internal shock mounting to reduce handling noise. Can be held in the hand or mounted on a lectern or stand for hands-free operation. Head Microphone (Headmic) - Is a microphone that is attached to a small, thin boom and fitted around the ear Typically an electret type micGooseneck Microphone - Microphones that are used most often on lecterns and conference tables. The microphone is attached to a flexible or bendable stem, which comes in varying lengths. Shock mounts are available to isolate the microphone from table or lectern vibrations Boundary Microphone - Microphone that relies on reflected sound from a surrounding surface. A boundary microphone sits directly on a table or surface. They are also called "surface mount microphones." they may be subject to papers accidentally being placed over them, laptops fans blowing on them, PZM Microphone - Instrument Mic - Shotgun Microphones - a long, cylindrical, highly sensitive, unidirectional microphone used to pick up sound from a great distance. Microphone Polar Response Types - Only Cool Sam has Bacon 1. Omnidirectional 2. Cardioid 3. Super-Cardioid 4. Hyper-Cardioid 5. Bi-Directional Omnidirectional Mic - Sound pickup is uniform in all directions., 360 degree coverage angle, no null angleCardioid Microphone (unidirectional) - Pickup is from the front of the microphone only (one direction) in a specific pattern. It rejects sounds coming from the side but the most rejection is at the rear of the microphone. Has a heart shaped polar plot. 131 Degree coverage angle 180 Degree null angle Supercardiod Microphone pickup - Provides better directionality than the hypercardioid. It has less rear pickup than the hypercardioid. 105 degree coverage angle 110 degree null angle Bi-Directional Microphone - Pickup is equal in opposite directions with little or no pickup from the sides. This is sometimes also referred to as a "figure-eight" pattern, referring to the shape of its polar plot. 90 degree coverage angle 90 degree null angle Polar Plot - is a graphical representation of the relationship between a device's directionality and its output. Frequency Response - is a shortened way of expressing a device's amplitude response versus frequency characteristic. Typically presented as a graph or plot of a device's output on the vertical axis versus the frequency on the horizontal axis