Lesson 1 (Introduction) Paging Systems

Question 1

Systems such as ___ and ___ will not typically be classified as distributed sound systems, but share some of the same characteristics and some use same equipment as distributed sound systems.

Answer 1

public address

sound masking

Question 2

___ are used in commercial application to distribute sound.

Answer 2

Paging systems

Question 3

When distributing sound, you must consider to create a ____ field. Paging and music overhead must be ___ and loud enough to hear.

Answer 3

uniform sound

intelligible

Question 4

Locations to find these systems:

Answer 4

• Offices, factories, warehouses
• Financial Institutions
• Retail stores and locations
• Transportation
• Hospitality
• Arts and Entertainment

Question 5

Office, Factory, Warehouse Applications

Answer 5

• General announcements to locate personnel, announce visitors and incoming calls.
• Tones: Responses of situations, various security, confidentiality needs, shift changes or breaks, and have the ability to prioritize music and/or paging
• Make single announcements to multiple locations/building simultaneously.
• Monitor noise
• Send pages or activate messages from a facility phone
• Sound masking

Question 6

Transportation Applications

Answer 6

Schedule information, announce arrival or departure times, emergency information, communicate with employees discreetly using tones.

Question 7

Methods used to distribute sound (constant/self amplified)

Answer 7

• Constant voltage system (25V or 70V)

- Self amplified (24V)

Question 8

Constant Voltage Systems (25V or 70V)

Answer 8

Uses centralamplifier - more speakers over a long distance

• 25V - Educational or institutional facilities where safety is a concern
• 70V - Most commonly used in USA.

Question 9

Self Amplified System (24V)

Answer 9

• Uses a line level signal and power supply
• Each speaker is its own amplifier
• Uses 4 wire configuration two 24V power, two audio
• Small institutions / six or fewer speakers.

Question 10

System Components

Answer 10

• Source components, mixers, amplifiers, mixer/amps, power supply, volume control, transformer, speakers, wire
• Microphones, tuners, CD players, etc (source components). Consider these devices to be input devices, enhance the system, and expands the capabilities of the system in the form of background music.

Question 11

Mixers

Answer 11

Combine signal/input selection
Allows signal control
Considered pre-amp
Does not provide amplification

Question 12

Amplifiers

Answer 12

Amplifies the signal provided by the mixer
Sends amplified signal to the speakers
Rated by power capabilities

Question 13

Mixer/Amplifier

Answer 13

Combination amp and mixer
Supplies power to amplified speakers
Size of power supply is important - must have enough current to power the system.

Question 14

Power Supply

Answer 14

Used in self-amplified system.

Must have enough current to power the system.

Question 15

Volume Controls

Answer 15

Used in constant voltage or self-amplified systems.

Used where controlling the volume is necessary.

Question 16

Transformers

Answer 16

25V and 70V systems
Have multiple taps
Multi-line transformers available to convert a conventional speaker to a speaker compatible to a constant system.

Question 17

Speakers and Horns

Answer 17

Essential piece of the pie
Have a number of variety depending on type
Horns - louder sounds, less quality
Speakers - High quality

Question 18

Accessories and Interface Devices

Answer 18

Voice activated relay
Tone generator
Matching transformer
Ambient noise sensor
Night ranger
digital feedback terminator