polar (or polar) of a microphone is a graphical representation on a plane of the sensitivity of a microphone according to the direction of origin of a signal that strikes it. Need to figure out how to involve a microphone in a given environment and on the other side to decide how to position themselves in relation to the sound source.
The most common figures are:
omnidirectional - the answer is almost uniform for any angle of incidence (circular diagram).
way - the answer is maximum if the sound source is placed in front of the microphone and gradually decreases when the source rotates around the microphone (perpendicular its axis), this type of response is obtained by combining a capsule with an omni-directional and bi-directional, depending on the prevalence of the contribution dell'omnidirezionale, pole figures are obtained more or less directional, cardioid
- presents an attenuation of about 6 dB at an incidence angle of 90 °, to reject completely the sounds coming from behind (the point of no recovery at 180 ° to the axis), the name comes from the shape of its polar pattern, which vaguely describes a stylized heart.
supercardioid - the answer is similar to that of the cardioid, but is even more directional. Presents an attenuation of about 8.7 dB at an angle of incidence of ± 90 ° and a posterior lobe of recovery (from reduced sensitivity and frequency response), the viewpoint is nothing to ± 125 ° axis.
Hypercardioid - directivity is even greater than the supercardioid with the effect of increasing the sensitivity back. Presents an attenuation of 12 dB at an angle of incidence of 90 ° and a larger posterior lobe and the point of no return is ± 110 ° from the axis.
bidirectional or "figure eight" - the answer is up to the sounds coming from the front or back of the microphone (incidence angles of 0 and 180 °), while it is nothing to the sounds coming from the sides (angles of incidence 90 ° and 270 °). (Reworking wikipedia)
0 comments:
Post a Comment