NSAM265SFA datasheet(29/58 Pages) NSC

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30 Command Set (Continued)

Set Vocabulary Type

type id

NSAM265SR

NSAM265SF

This command selects the vocabulary table to be used for

voice synthesis The vocabulary type is set according to the

1-byte

type parameter

0 Internal vocabulary (default)

1 External vocabulary in ROM

2 External vocabulary in AFLASH (NSAM265SF only)

all others Reserved

type is 0 id is ignored

Each external vocabulary table has a unique id which is part

of the vocabulary internal header (See the IVS User’s Manu-

al for more details) If

type is 1 or 2 the CompactSPEECH

searches for the one byte

id parameter in each vocabulary

table header until a match is found

If the

id parameter does not point to a valid IVS vocabulary

ERR

PARAM is set in the error word

Say Words

n word1

wordn

NSAM265SR

NSAM265SF

This command accepts the number of words to synthesize

(

n 1 byte) followed by the indexes of the words (1 byte

each) in the current vocabulary

n can be 1 to 8 It plays the

words On completion the EV

NORMAL

END bit in the

status word is set and the MWRQST signal goes low

If one of the words is not defined in the current vocabulary

or if it is an IVS control or option code ERR

PARAM is set

in the error word

TUNE

Tune

index parameter

value

NSAM265SR

NSAM265SF

Sets the value of the tunable parameter identified by

index

(one byte) to the 2-byte value

parameter

value This com-

mand may be used to tune the DSP algorithms to a specific

Data Access Arrangement (DAA) interface or to change

other parameters If you do not use TUNE the Compact-

SPEECH uses default values

index does not point to a valid tunable parameter ERR

PARAM is set in the error word

Note

The tunable parameters are assigned with their default values on

application of power The INIT command does not affect these pa-

rameters

Table 3-1 describes the tunable parameters their index

numbers and their default values

TABLE 3-1 Tunable Parameters

Index

Parameter Name

Description

Default

0 – 3

Reserved

SIL

THRESHOLD

Prevents speech from being interpreted as silence The silence detection

11264

algorithm has an adaptive threshold which is changed according to the noise

level This parameter is therefore only the initial threshold level

Legal values 9216 to 13824 in 512 (6 dB) steps

SIL

THRESHOLD

STEP

Defines the adaptive threshold changes step If this threshold is too low the

threshold converges too slowly If this threshold is too high silence detection is

too sensitive to any noise

Legal values 3 to 48

SIL

BURST

THRESHOLD

The minimum time period for speech detection during silence As this threshold

increases the time period interpreted as silence increases If this threshold is

too low speech is detected if there is a burst of noise If it is too high words may

be partially cut off

Legal values 1 to 3

SIL

HANG

THRESHOLD

The minimum time period for silence detection during speech As this threshold

increases the time period interpreted as silence decreases If this threshold is

too low words may be partially cut off If it is too high silence is detected

Legal values 8 to 31

SIL

ENABLE

Silence compression control

0 turns silence compression off

ENERGY

FACTOR

Determines the energy level used to synthesize silence The default value

8192

means that the energy level of the synthesized silence will be the same as the

energy level of the recorded silence

If you divide (multiply) the default value by two the synthesized silence will be 6

dB less (more) than the level of the recorded silence

Legal values 1024 to 16384

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