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S-SYN-PT (Speech Synthesis Port)
Issue 1 June 2005 1979
S-SYN-PT (Speech Synthesis Port)
S8700 | 8710 / S8500
The TN725B Speech Synthesis circuit pack provides four independent Speech Synthesis ports
which may be connected to any of the voice time slots on the Time Division Multiplex (TDM)
Bus. Each Speech Synthesis port consists of a speech synthesizer device (SSD) and is
managed by a custom-coded programmable speech synthesizer (PSS) controller. The PSS
controller is, in turn, controlled by the on-board microprocessor via a command interface
specifically designed for this application. The PSS controller’s main function is the orderly
transfer of encoded speech from the speech vocabulary read-only memory (ROM) to the SSDs.
The SSDs decode it and produce 64-kbps 5-255 PCM (Pulse Code Modulation) speech. The
encoded speech is stored in up to 512 Kbytes of on-board ROM. In addition, each Speech
Synthesis port has an associated dual-tone multifrequency receiver (DTMR) to receive
touch-tone digits from a station set connected to the port via a voice time slot. The station set
may be connected to the Speech Synthesis port through either a line or trunk circuit.
When there is an incoming call to a port, the “listen” network time slot is connected to the DTMF
receiver input and the “talk” network time slot is connected to the SSD output. This enables the
Speech Synthesis port to support speech synthesis features or touch-tone input with voice
response features. Some of the features that use the Speech Synthesis port’s capabilities
include Leave Word Calling, Automatic Circuit Assurance, Automatic Wakeup (hotel-motel), and
Do Not Disturb (hotel-motel).
The Speech Synthesis circuit pack supports different voice features than ones supported by the
Announcement circuit pack.
Error Log Entries and Test to Clear Values
MO name Alarm Level Initial SAT Command to Run Full Name of MO
S-SYN-PT MAJ test port location sh Speech Synthesis port
S-SYN-PT MIN test port location l Speech Synthesis port
S-SYN-PT WRN test port location sh Speech Synthesis port
Table 725: Speech Synthesis Port Error Log Entries
Error
Type
Aux
Data
Associated Test Alarm
Level
On/Off
Board
Test to Clear Value
0 (a
) 0 Any Any Any test port location sh r 1
1 (b
) 17672 None
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