American Audio VELOCITY - REV 4-05 Instructions d'exploitation télécharger pdf (Page 113)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-108 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

Equipment shall be provided to allow recording and storing of new

announcements on local message repeater devices.

C. Provision shall be made for ROC Initiation and Selection of prerecorded

voice announcements from the ROC console.

D. The station EMP shall be able to broadcast an emergency evacuation

message from the local digital message repeater announcement device.

9.8.1.4 PA Zones

A. Separate zones with separate amplifying systems and speaker systems shall be

accessible individually or in combination. Passenger stations typically have one

to three zones covering; platform, mezzanine and ancillary areas. Shops and

yard areas have typically nine zones and ROC has typically four zones.

B. Zones for the ROC PA subsystem shall be uniform and provide an SPL of 70

dBA measured on axis of speakers at a point 4-feet above the floor and not less

than 60 dBA plus or minus 60 degrees off axis.

9.8.1.5 Standby Amplifiers

Hot-standby power amplifiers shall be provided on a one-for-two basis for each

power amplifier used in the PA subsystem installation. The hot-standby amplifiers

shall be switched to active use by the PA supervisory function.

9.8.1.6 Speaker By Local Microphones

Provision shall be made to reduce output level of speakers in close proximity of local

microphones to prevent acoustic feedback.

9.8.1.7 Noise-Operated Level Adjustments for Power Amplifiers

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American Audio VELOCITY - REV 4-05 Instructions d'exploitation Page 113