isd-t360sb ETC-unknow, isd-t360sb Datasheet - Page 37

• Manufacturer Part Number: isd-t360sb
• Manufacturer: ETC-unknow

2—SOFTWARE
Chapter 2—SOFTWARE
The VoiceDSP software resides in the on-chip
ROM. It includes DSP-based algorithms, system
support functions and a software interface to
hardware peripherals.
2.1
This section provides details of the system support
functions and their principle operation. It is divided
into the following subjects:
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2.1.1
The ISD-T360SB operates in two modes, normal
mode (DTAD) and speakerphone mode. To
change the mode use the Set Speakerphone
Mode (SSM) command. The VoiceDSP processor
functions as a state machine under each mode.
It changes state either in response to a command
sent by the microcontroller, after execution of the
command is completed, or as a result of an inter-
nal event (e.g. memory full or power failure). For
more information see “VoiceDSP PROCESSOR
COMMANDS—QUICK REFERENCE TABLE” on page
2-22. The VoiceDSP states in DTAD mode are de-
scribed below.
RESET
The VoiceDSP processor is initialized to the RESET
state after a full hardware reset by the RESET signal
(See “RESETTING” on page 1-3). In this state the
processor detectors (VOX, constant energy, call
progress tones and DTMF) are not active. In all oth-
ISD
The State Machine
Command Execution
Event Handling
Message Handling
Tone Generation
Initialization and Configuration
Power Down Mode (PDM)
SYSTEM OPERATION
THE STATE MACHINE
er states, these detectors are active. (See the SDET
and RDET commands for further details).
IDLE
This is the state from which most commands are
executed. As soon as a command and all its pa-
rameters are received, the processor starts exe-
cuting the command.
RECORD
In this state a message is compressed (unless
stored in PCM format) and recorded into the mes-
sage memory.
PLAY
In this state a message is decompressed (unless
stored in PCM format), and played back.
SYNTHESIS
An individual word or a sentence is synthesized
from an external vocabulary in this state.
TONE_GENERATE
In the TONE_GENERATE state, the VoiceDSP pro-
cessor generates single or DTMF tones.
MSG_OPEN
The VoiceDSP processor either reads or writes 32
bytes to the message memory, or sets the mes-
sage read/write pointer on a 32 byte boundary.
POWER DOWN MODE
In this state, the power consumption is reduced for
the VoiceDSP processor. For more information, re-
fer to the Power Down Mode section on page 2-5.
ISD-T360SB
2-1