DE6107
1
SP-3
Speech Processor Module
Installation Instructions
1. INTRODUCTION
The SP-3 speech processor is an advanced electronic
record/playback module for short voice messages, up to 20
seconds long. Designed for manual recording and electronically
triggered playback, the SP-3 provides 1 Watt of audio output.
The primary application of the SP-3 is an inexpensive, easy-to-
install automatic announcer, triggered by motion detectors or any
type of momentary switch. The module is suitable for automatic
transmission of verbal warnings, announcements, guidance and
advertisements in elevators, stairwells, corridors, exhibitions, etc.
A miniature microphone and an easily accessible RECORD
pushbutton are included in the module. Loudspeaker output
terminals are provided for direct connection to an external
loudspeaker. An audio input header permits the installer to choose
(by the corresponding jumper, as shown in Figure 1) between
recording a message with the internal microphone (
INT
) and
recording a message from an external audio source (
EXT
).
When triggered by a short pulse, the speech processor plays the
recorded message once and then stops. With continuous
triggering, the message is repeated over and over again, until the
trigger voltage is removed.
The module is suitable for mounting within a host system cabinet or
inside the loudspeaker housing. The SP-3 may be supplied
mounted in a small plastic cabinet with a built-in 63 mm / 1 W (2-
1/2" / 1W) loudspeaker.
Operating power is drawn from the host system or from an
external 12 VDC supply.
ST
SIG
12V
ST+ ST–
+
–
1W / 8
Ω
SPEAKER
SPEAKER
VOLUME
CONTROL
NEGATIVE
TRIGGER
INPUT
RECORD
BUTTON
MICRO-
PHONE
START
JUMPER
POSITIVE
TRIGGER
INPUT
FROM
12 VDC (+)
SUPPLY
GROUND
(NEGATIVE)
SUPPLY LEAD
MOUNTING
HOLE (1 OF 3)
VOL.
SPK
SPEAKER
CONN.
(OPTION)
INT EXT
+ –
AUDIO INPUT
HEADER
Figure 1.
SP-3 Layout and Connections
2. SPECIFICATIONS
Maximum Recording Duration:
20 seconds.
Memory Type:
EEPROM (no need for battery backup).
Triggering Methods:
Positive voltage applied to the
ST+
terminal.
Negative (ground) potential applied to the
ST–
terminal.
A short circuit imposed across the
ST
pins on the PCB.
External Audio Input Level:
100 mV p-p maximum.
External Audio Input Impedance:
12 k
Ω
Supply Voltage:
12 VDC ±15%
Operating Temperatures:
0°C to 50°C (32°F to 122°F)
Loudspeaker
Output:
1W across 8
Ω
Current
Consumption
(approx.):
6 mA (standby);
30 mA (record);
300 mA peak (playback)
Dimensions
(H x W x D):
62 x 37 x 16 mm
(2-7/16 x 1-7/16 x 5/8 in)
Weight:
20 g (0.75 oz)
3. INSTALLATION
Use the 3 mounting holes of the SP-3 (Figure 1). Remember to
leave adequate clearance between the bottom of the PCB and
any metal surface.
3.1 Triggering with a Motion Detector's
Normally Closed Switch
To operate the speech processor as an automatic announcer
triggered with a motion detector’s N.C. terminals or with any
momentary N.C. switch, proceed as follows:
A.
Connect an 8-ohm / 1 Watt loudspeaker across the SIG and
12V (–)
terminals.
B.
Connect the motion detector's N.C. terminals or the
momentary N.C. switch between the voice processor's
ST+
and
12V (–)
terminals.
C.
Use the jumper provided with the unit to short the two
ST
pins
permanently together (these pins are clearly identified in
Figure 1).
D.
Connect the 12 VDC supply to the
12V (+)
and
(–)
terminals,
taking care not to reverse the positive and negative leads.
E.
Record a message as explained in Section 4.
3.2 Triggering with a Normally Open
Switch
To operate the speech processor as an automatic announcer
triggered with any momentary N.O. switch, proceed as follows:
A.
Connect an 8
Ω
/ 1W loudspeaker across the
SIG
and
12V (–)
terminals.
B.
Connect the momentary N.O. switch between the speech
processor
ST+
and
12V (+)
terminals. A second method is to
connect the N.O. switch between the
ST–
and
12V (–)
terminals. A third method is to connect the N.O. switch across
the two pins of the ST header on the printed circuit board.
C.
Connect the 12 VDC supply to the
12V (+)
and
(–)
terminals,
taking care not to reverse the positive and negative leads.
D.
Make sure that the jumper is removed from the two
ST
pins. A
good practice is to mount the jumper on a single pin, to
prevent it from getting lost.
E.
Record a message as explained in Section 4.
