MSM66P54 datasheet(39/46 Pages) OKI

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¡ Semiconductor

MSM6679AL-110 Voice Recognition Processor

Request (Continued)

Opcode

Action

Return Value

F505h

Initialization is complete.

F501h

Initialize in Background. Background noise

initialization is performed for 500 ms.

The MSM6679AL-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.

F506h

Four digit ASCII number.

XXXX

Retrieve Vocabulary and Trigger Table Revision

Number.

F507h

Save is complete.

F501h

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).

F508h

No return value

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).

F509h

—

Select Default SI Vocabulary. (First FLASH)

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