ISD-T360 ETC [List of Unclassifed Manufacturers], ISD-T360 Datasheet - Page 44

• Manufacturer Part Number: ISD-T360
• Description: VoiceDSP Digital Speech Processor with Master/Slave, Full-Duplex Speakerphone, Multiple Flash and ARAM/DRAM Support
• Manufacturer: ETC [List of Unclassifed Manufacturers]

2.1.5
The VoiceDSP processor generates DTMF tones
and single-frequency tones from 300Hz to 3000Hz
in increments of 100Hz. The ISD-T360SB tone gen-
eration conforms to the EIA-470-RS standard.
Note, however, that value of some tunable pa-
rameters may need adjusting to meet the stan-
dard specifications since the energy level of
generated tones depends on the analog circuits
used.
Refer to table 2-5, VC command and GT com-
mand of the Command Description section for
furhter details of the relevant tunable parame-
ters and commands.
NOTE
2-4
1.
2.
3.
Tune the DTMF_GEN_TWIST_LEVEL param-
eter to control the twist level of the gener-
ated DTMF tones.
Use the VC (Volume Control) command,
and tune the TONE_GEN_LEVEL parame-
ter, to control the energy level at which
these tones are generated.
Use the GT (Generate Tone) command to
specify the DTMF tones, and the frequen-
cy at which single tones are generated.
The
degraded during tone generation, espe-
cially if the frequency of the generated
tone is close to the frequency of one of the
DTMF tones.
TONE GENERATION
DTMF
detector
performance
is
2.1.6
Use the following procedures to initialize the
VoiceDSP processor:
NORMAL INITIALIZATION
Reset the VoiceDSP processor by activating the
RESET signal. (See “RESETTING” on page 1-3.)
TUNABLE PARAMETERS
The VoiceDSP processor can be adjusted to the
specific system’s requirements using a set of tun-
able parameters. These parameters are set to
their default values after reset and can be later
modified with the TUNE command. By tuning
these parameters, you can control various as-
pects of the VoiceDSP processor’s operation,
such as silence compression, tone detection,
and no-energy detection.
Tables 2-4 to 2-11 of the Command Description
section describe all the tunable parameters in
detail.
1.
2.
3.
Issue a CFG (Configure VoiceDSP proces-
sor) command to change the configura-
tion according to your environment.
Issue an INIT (Initialize System) command
to initialize the VoiceDSP firmware.
Issue a series of TUNE commands to adjust
the VoiceDSP processor to the require-
ments of your system.
INITIALIZATION AND CONFIGURATION
Voice Solutions in Silicon
2—SOFTWARE
™