Page 69 - 14th @ Irving Basis of Design (internal)

• The system shall support minimum of 3 types of messages. Each message shall have an audio and visual element to
provide visual paging that duplicates the audio in the designated zones. The audio and visual elements shall start
together and maintain continuous synchronization through the duration of the message.
• Some messaging may require the use of a dedicated or virtual system database server. Contractor shall confirm the
necessary hardware required for each type of message to be utilized.

o Standard Messages: These are standard single file (take) messages of following categories. Standard messages
may be assigned to any zone or zone group and may be initiated by any assigned communications station or
scheduled for play by the system clock.
o Emergency announcements and instructions.
o Public service announcements (no parking, no smoking, etc.)
o Regulatory (do not leave bags unattended, etc.)

o Other institutional messages.
• Text-to-Speech Messages – Text-to-Speech Messages shall use a high quality text to speech engine to create audio
messages from text. Text-to-Speech messages shall be used only for courtesy announcements where announcements
require dynamic messages and real voice takes cannot be anticipated or recorded.

10.1.13 AMBIENT NOISE ANALYSIS AND CONTROL
The system shall include the capability to automatically adjust the volume levels in each zone based on changes in the ambient
noise levels in those zones.
• Each zone that includes a sensor within its boundaries shall have automatic control. Typical coverage of 1 to 2
sensors in a zone and space them 8 feet above the finished floor and 1/3 of the way into a zone for a concourse and
near the center of a gate zone. Preference vertical surfaces as opposed to ceiling. Average the two sensors or take
one sensor and assign it to more than one amplifier channel as long as it’s in the same amp frame.

• The system shall automatically null announcement or program material for that zone to prevent “runaway” or
inaccurate volume tracking, and shall provide smooth unobtrusive control.

10.1.14 SYSTEM EQUALIZATION

The system shall provide for frequency response equalization for each speaker zone output.
• Filter types shall allow notch, high pass, or low pass.
• Filters shall have a Q range of 0.055 to 33.

• Provide 9 filters for each zone output.

10.1.15 AUTOMATIC BACKUP AMPLIFIER SWITCHING

The system shall include backup amplifier switching in the event of the failure of a power amplifier.

• The system shall automatically detect failure or abnormal operation of a power amplifier, and replace it with a spare
amplifier without operator initiation.
• One spare power amplifier shall be installed for each 8 installed amplifiers.
• The spare amplifiers shall be only be powered up when they are transferred into service. The system shall detect a
failure, power up the spare amplifier, and complete the transfer for restored operation within 2 seconds of an
amplifier failure.

14th @ IRVING WSP
Project No. B1809809.000
RAL COMPANIES & AFFILIATES Page 69