E&OEIssue_1.0
The paging microphone shall be capable of paging up to 8 zones either
individually, in user-denable groups, or all zones simultaneously. The
microphone shall be available in versions with 4 or 8 zone paging
buttons. It shall also be possible to interconnect up to 32 paging
microphones with full operational transparency, via standard CAT-5
cabling.
The microphone shall become active when a non-latching
‘TALK/SEND’ button is pressed. Zone selection shall be by
electronically latching buttons, with selection conrmed by an LED.
A non-latching ‘CALL ALL’ button shall also be provided, selecting
paging to all supported zones. A ‘CLEAR’ button will be provided
to cancel incorrect zone selections. There shall be four ‘GROUP’
buttons allowing selection of multiple zones, and it shall be possible
to program each with any combination of zones. There shall be four
zone groups on the 4-zone version and eight on the 8-zone version,
the second set of four being selected by a double-press. Each button
shall have an adjacent legend area for user’s zone identication.
It shall be possible to adjust the paging audio level by an internal
adjustment.
The microphone shall have an internal message facility able to replay
up to eight digital audio les from a removable memory device.
Compatibility with WMA and MP3 format les at a range of sampling
rates from 8 kHz to 48 kHz shall be provided as a minimum. There
shall be a dedicated set of buttons, with LED indication, to select
each sound le from the front panel. The selected message will be
routed to the same audio output as the paging microphone when
the ‘TALK/SEND’ button is pressed. It shall be possible to adjust the
message audio level by an internal adjustment.
It shall be possible to include a message as part of a zone group
denition. A set of external trigger inputs shall be provided, which
when active, cause the programmed message to be routed to the
zones comprising the group it has been programmed to. It shall be
possible to congure the trigger inputs as either normally-open
(NO) or normally-closed (NC).
It shall be possible to congure the microphone to output a pre-
announcement chime when the ‘TALK/SEND’ button is pressed.
The chime shall be derived from a separate set of audio les on
the memory device. It shall be possible to precede pre-recorded
messages with either the same chime or an alternative chime. The
memory card shall be able to store up to eight chime les, and it shall
be possible to assign any one to each zone group, whether or not
a message is assigned to it as well. It shall be possible to adjust the
chime level by an internal adjustment.
The microphone itself shall be mounted on a gooseneck and be non-
removable.
The paging microphone will interface directly to compatible mixers
via a digital interface carrying audio, zone selection and power on a
single CAT-5 cable. It will also be equipped with an analogue interface
consisting of an audio output and a separate short-to-ground control
port, permitting its use with any other mixers equipped with this
type of access. The analogue zone selection interface shall be able to
sense when any paralleled system is active.
The microphone will be capable of being powered via either type of
interface, or from a local external PSU. The unit will operate from
both DC (12-24 V) and AC (9-17 V) supplies.
It shall be possible to set various conguration options which will
not be resettable by the user and which will be reinstated after a
power interruption: i) setting zone selection to either remain in place
post-announcement, or to self-cancel; ii) offsetting zone numbering,
allowing a microphone to address a different (but consecutively-
numbered) set of zones; iii) locking group denitions so they cannot
be altered by the operator; iv) assigning two levels of priority,
whereby ‘high’ priority will take precedence when messages conict
when multiple microphones are in use; v) disabling one or more
zone select buttons so that the user does not have paging access to
certain zones.
The paging microphone shall be built in a compact steel housing with
a non-slip base for desktop use. It shall also be possible to mount
the microphone on a wall, and an alternative, shorter gooseneck
microphone shall be available as an option to facilitate this.
The paging microphone shall be the Cloud PM-SA Series; Model
PM4-SA (4 zones, 4 messages, 4 chimes) or the PM8-SA (8 zones, 8
messages, 8 chimes).
Architect’s and Engineer’s Specication
