msm6679a-110 Oki Semiconductor, msm6679a-110 Datasheet - Page 43

• Manufacturer Part Number: msm6679a-110
• Description: Si/sd Voice Recognizer, Recorder/player, And Speech Synthesizer
• Manufacturer: Oki Semiconductor

¡ Semiconductor
Request (Continued)
Opcode
F505h
F506h
F507h
F508h
F509h
Initialize in Background. Background noise
initialization is performed for 500 ms.
The MSM6679A-110 requires this command
prior to recognition for noise vector subtraction
during the utterance sampling period. Use the
background initialization command whenever
there is a change in the background noise level.
For example, sample the noise signature in a
vehicle at rest and moving at 35 MPH with its
windows rolled down. The quality of a phone
line connection can also vary from call to call.
The host MCU must implement a strategy as to
when to issue a background initialization
command. In a vehicle, the host MCU could
monitor the vehicle speed, fan speed, radio
volume, etc. Alternatively, the host MCU could
issue this command each time a new
recognition session starts or a new line
connection is established.
However, the 0.5-sec sample period could
degrade system responsiveness if used too
frequently. A zero in this bit location during the
F2XXh command will not cause an initialization.
The F2xxh command can also be used to
perform background noise initialization.
Retrieve Vocabulary and Trigger Table Revision
Number.
Save SDR templates in last FLASH. Save the
download RAM bank SD template area.
Saves 2684 bytes from the address set by the
F103 command to the address range F300-
FD7F in the last FLASH. The default is 4A00-
547B F300-FD7F).
Get SDR templates from last FLASH. Get the
download RAM bank SD template area.
Saves 2684 bytes to the address set by the
F103 command from the address range F300-
FD7B in the last FLASH. The default is (F300-
FD7B 4A00-547B).
Select Default SI Vocabulary. (First FLASH)
Action
MSM6679A-110 Voice Recognition Processor
F501h
XXXX
F501h
No return value
—
Initialization is complete.
Four digit ASCII number.
Save is complete.
—
Return Value
41