background image

CROWN MICROPHONE APPLICATION GUIDE:

SECURITY AND SURVEILLANCE

© 2001 Crown Audio, Inc. All rights  reserved PZM® 
is a registered trademark of Crown International. 
Also exported as Amcron®

102100-2
11-01

Crown International
P.O. Box 1000,
Elkhart, Indiana 46515-1000
(574) 294-8200 Fax (574) 294-8329

Содержание PZM-10

Страница 1: ...TY AND SURVEILLANCE 2001 Crown Audio Inc All rights reserved PZM is a registered trademark of Crown International Also exported as Amcron 102100 2 11 01 Crown International P O Box 1000 Elkhart Indiana 46515 1000 574 294 8200 Fax 574 294 8329 ...

Страница 2: ... use a miniature mic capsule mounted very near a sound reflecting plate or boundary in the Pressure Zone In this zone direct sound from the sound source combines in phase at all frequencies with reflected sound off the boundary The benefits are many 6 dB more sensitivity 6 dB less noise a wide smooth frequency response free of phase interference excellent clarity and reach hemispherical half omni ...

Страница 3: ...tly to a wireless transmitter At the end of the mic cable you solder on a connector that mates with your transmitter APPLICATIONS Large rooms warehouses parking garages offices etc One way to cover a large room is with PZMs on the ceiling Fig 1 Figure 1 How far apart should the mics be to get uniform cov erage Use the 2 to 1 rule The spacing between mics should be two times the distance from mouth...

Страница 4: ...it pick up less reverb than the omnidirectional PZM If the MB 3 is overhead of the talkers it picks them up approximately 90 degrees off axis where its output is reduced by 9 dB So it picks up talkers rather weakly but picks up reverb strongly on axis The MB 3 works best when talkers are in front of the mic and within its 60 degree pickup angle For example when the mic is near a wall and the talke...

Страница 5: ...ple Entry Mount a PZM in an overhang or mount an MB 3 aiming down over the entry Fig 6 It is best not to expose the microphone to rainfall Figure 6 GLM 100 techniques The GLM 100 miniature mic is easy to install and is for temporary use Simply tape it to a wall ceiling or upper corner of a room If possible place the GLM so it has a line of sight to the person speaking A mic behind a barrier or fab...

Отзывы: