isd-t360sb ETC-unknow, isd-t360sb Datasheet - Page 40

• Manufacturer Part Number: isd-t360sb
• Manufacturer: ETC-unknow

ISD-T360SB
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
further details of the relevant tunable parameters
and commands.
NOTE
2-4
1. Tune the DTMF_GEN_TWIST_LEVEL parame-
2. Use the VC (Volume Control) command,
3. Use the GT (Generate Tone) command to
ter to control the twist level of the generat-
ed DTMF tones.
and tune the TONE_GEN_LEVEL parameter,
to control the energy level at which these
tones are generated.
specify the DTMF tones, and the frequency
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.)
NOTE
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.
Table 2-4 to Table 2-12 of the Command Descrip-
tion section describes all the tunable parameters
in detail.
1. Issue a CFG (Configure VoiceDSP proces-
2. Issue an INIT (Initialize System) command to
3. Issue a series of TUNE commands to adjust
sor) command to change the configura-
tion according to your environment.
initialize the VoiceDSP firmware.
the VoiceDSP processor to the require-
ments of your system.
The
(tunable parameter number 62) should be
done before the CFG command. This tune
operation should be executed when using
flash memory other than 4Mb. The tuning
of
parameter number 63) should be done
before the INIT command.
INITIALIZATION AND CONFIGURATION
tuning
NUM_OF_BLOCKS_FOR_TEST
of
NUM_OF_BLOCKS_IN_MEM
Voice Solutions in Silicon
2—SOFTWARE
(tunable
™