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參數資料
| 型號： | ISD-T360SB |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | VoiceDSP Digital Speech Processor with Master/Slave, Full-Duplex Speakerphone, Multiple Flash and ARAM/DRAM Support |
| 中文描述： | VoiceDSP數字語音處理器與主/從，全雙工揚聲器，多重閃光和雅藍/內存支持 |
| 文件頁數： | 41/109頁 |
| 文件大?。?/td> | 1567K |
| 代理商： | ISD-T360SB |
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2—SOFTWARE
ISD-T360SB
2-1
ISD
Chapter 2SOFTWARE
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
SYSTEM OPERATION
This section provides details of the system sup-
port functions and their principle operation. It is
divided into the following subjects:
The State Machine
Command Execution
Event Handling
Message Handling
Tone Generation
Initialization and Configuration
Power Down Mode (PDM)
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 com-
mand sent by the microcontroller, after execu-
tion of the command is completed, or as a result
of an internal event (e.g. memory full or power
failure). For more information see “VoiceDSP
PROCESSOR COMMANDS—QUICK REFERENCE
TABLE” on page 2-21. The VoiceDSP states are
desctibed below:
THE STATE MACHINE
RESET
The VoiceDSP processor is initialized to the RESET
state after a full hardware reset by the RESET sig-
nal (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 other states, these detectors are active. (See
the SDET and RDET commands for further de-
tails).
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.
PLAY
In this state a message is decompressed (unless
stored in PCM format), and played back.
RECORD
In this state a message is compressed (unless
stored in PCM format) and recorded into the
message memory.
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.
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