Crown GLM-100 Benutzerhandbuch

CROWN MICROPHONE APPLICATION GUIDE:

SECURITY AND SURVEILLANCE

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

CROWN MICROPHONE

APPLICATION GUIDE

SECURITY AND SURVEILLANCE

This guide offers tips on using Crown microphones

to safeguard areas such as warehouses, offices, park-

ing garages, and building entries. Using these micro-

phones, a security officer can detect break-ins or

other undesirable activities. We’ll also describe how

to pick up police interviews and psychiatric sessions.

First let’s look at Crown’s line of mics for security

applications. All the mics are very small, and are

designed NOT to look like microphones, so they are

nearly invisible. They provide clear pickup of

speech.

In all these microphones, the low frequencies below

the voice range are filtered out to reduce rumble from

trucks, machinery and air conditioning. At high fre-

quencies, the response is boosted to help articulation.

Because of their tailored response, the Crown secu-

rity mics pick up conversations or other desired

sounds with extra clarity.

Some of the models are Pressure Zone Microphones

(PZMs). They 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) pickup pattern

• consistent pickup anywhere around the micro-

phone.

Other models are Mini Boundary (MB) mics. They

use a miniature, unidirectional mic capsule mounted

very near a boundary. Because they are directional,

MB mics can pick up less room reverb than PZMs

do. The result is an even clearer sound.

Below are notes on each Crown microphone model:

PZM-10

This is a miniature PZM that looks like a light

switch. The mic has built-in electronics, which are in

an attachedtube. The tube mounts in a ceiling, panel,

wall or table. It comes with an XLR-type connector

and requires 12-48V phantom power.

PZM-11

Like the PZM-10, the PZM-11 resembles a light

switch. It mounts in a standard electrical outlet box.

The mic comes with a screw-terminal connector and

requires 12-48V phantom power.

The

PZM-11LL

is the same as the PZM-11, but has a

line-level output. This lets you record directly into a

VCR without a mic preamp. The PZM-11LL can be

powered in two ways: 24V AC or 12-24V DC. In

video security systems, 24V AC is usually available,

and this can be used to power the mic. The output

connector is screw terminals.

The

PZM-11LLWR

is the same as the PZM-11LL,

but is weather resistant.

MB-3

This is a miniature supercardioid mic with attached

electronics that mounts in a ceiling panel, wall or

table. The mic comes with an XLR-type connector

and requires 12-48V phantom power.

GLM-100

This mini omnidirectional mic is easy to install tem-

porarily. Just tape it to any convenient surface. The

mic has an XLR-type output and runs off phantom

power.

The

GLM-100/E

is the same, but can be connected

directly 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 to

ceiling. For example, if the ceiling is 5 feet above the

talkers’ mouths, the mics should be 10 feet apart.

Then the mics will pick up everyone about equally.

In general, use as few mics as possible that will do

the job.

If several mics are on at the same time, the recorded

sound might be reverberant or muddy. It helps to run

all the mics into a gated mixer (automatic mixer),

which turns on only one mic at a time – the one near-

est the person speaking. This keeps the sound clear.

If the ceiling is very high, mount the PZM-11 or

PZM-11LL on support posts and/or walls, about 10

feet off the floor (out of reach).

Medium size room (small office,

group therapy room, home, etc.)

Here you have a choice of PZM mics or the MB-3

mic. The PZMs are omnidirectional; the MB-3 is

unidirectional.

If the mic must be mounted in the ceiling near a wall,

and most talkers are in the middle of the room, the

MB-3 is a better choice (Fig. 2). It will pick up less

room reverberation than the PZM would in the same

location.

Figure 2

If the mic can be mounted in the ceiling near the mid-

dle of the room, and most talkers are in the middle of

the room, the PZM is the better choice (Fig. 3). It

will pick up less roomreverb than the MB-3would in

the same location.

Figure 3

Since the MB-3 is unidirectional, why doesn’t 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 talkers

are in the middle of the room (Fig. 2).

Police interview room or psychia-

trist office

Mount a PZM-10, PZM-11, or PZM-11LL in the

ceiling directly over the interview table (Fig. 4).

Another placement is in a wall close to the table at

mouth height. Since the mic resembles a light

switch, it does not intimidate the interviewee.

Figure 4

If possible, deaden the room acoustics by adding cur-

tains, carpet, or acoustic-tile ceiling. This reduces

room reverb and provides a clearer sound.

Subway station

Mount PZMs of your choice in posts, in the ceiling,

or in walls.

Mount the mics 10 feet above the floor, out of reach

(Fig. 5).

Figure 5

If the mics will be 10 feet from people on the aver-

age, mount the mics 20 feet apart to pick up everyone

about equally. That is, the mics should be no more

than twice as far apart as they are from the people.

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 fabric

tends to sound muffled.

By following the suggestions in this guide, you

should be able to discreetly pick up speech and other

sounds with clarity.

Andere Handbücher für GLM-100

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