NSAM266SAASLASHV datasheet(45/52 Pages) NSC

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20 Software (Continued)

TABLE 2-2 Tunable Parameters

(Continued)

Index

Parameter Name

Description

Default

DTMF

TWIST

LEVEL

A one-byte value that controls the twist level of a DTMF tone generated by the GT

command by controlling the energy level of each of the two tones (low frequency and

high frequency) composing the DTMF tone The Least Significant Nibble (LSN)

controls the low tone and the Most Significant Nibble (MSN) controls the high tone

The energy level of each tone as measured at the output of a TP3054 codec (before

the DAA) connected to the CompactSPEECH is summarized in the following table

Nibble Value

Tone energy (dB-Volts)

178

143

129

124

120

119

1185

8–15

1185

The volume of the generated DTMF tone during meaurements was 6

(TONE

GENERATION

LEVELaVOL

LEVEL e 6)

For the default level the high tone is b143 dBV and the low tone is b124 dBV

which gives a DTMF twist level of 19 dB

The energy level of a single generated tone is the level of the low tone

Reserved

Example

TUNE 23 700

Byte sequence

Microcontroller

15 17 02 BC

CompactSPEECH 15 17 02 BC

Description

Set the minimum period for busy

detection to seven seconds

Volume Control

vol

level

Controls the energy level of all the output generators (play-

back tone generation and voice synthesis) with one com-

mand The resolution is g3 dB

The actual output level is composed of the tunable level

variable plus the

vol

level The valid range for the actual

output level of each output generator is defined in Table 2-2

For example if the tunable variable VCD

LEVEL is 6 and

vol

level is b2 then the output level equals VCD

LEVEL

vol

level e 4

Example

VC 04

Byte sequence

Microcontroller

28 04

CompactSPEECH 28 04

Description

Set the volume level to VCD

LEVEL a

WRAM

Write Memory

tag data

This command creates a new message with a message tag

tag The following 32 bytes of data data are stored as the

new message data in the message memory

The WRAM command switches the CompactSPEECH to

the MEMORY

WRITE

state As long as it remains in this

state each subsequent WMEM command appends new

message data to the end of the previous data

The

CompactSPEECH remains in the MEMORY

WRITE

state

until an S command is issued Note that while the Compact-

SPEECH is in the MEMORY

WRITE

state

tag is ignored

the

memory

becomes

full

recording

stops

and

MEMFULL is set in the status word

Example

WMEM 1

32 bytes

Byte sequence

Microcontroller

17 01

32 bytes of

data to write

CompactSPEECH 17 01

echo 32 bytes

of data

Description

Create a message with tag e 01 and

write 32 bytes in the message memory

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