isd-t360sb ETC-unknow, isd-t360sb Datasheet - Page 97

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

2—SOFTWARE
NOTE:
ISD
44
45
46
33
42
Index
Refer to the Software Automatic Gain Control tunable parameters, listed in Table 2-4, for more details on
speakerphone-related tunable parameters.
Electric Echo Canceler
(EEC):
SP_EEC_VOX_HYST
Acoustic Echo Canceler
(AEC):
SP_AEC_DTD_TH
Electric Echo Canceler
(EEC):
SP_EEC_DTD_TH
Attenuation:
SP_BLOCK_LEVEL
Tone Generation:
SP_TONE_GEN_
LEVEL
Parameter Name
Table 2-9: TUNABLE PARAMETERS: Speakerphone
Controls the hysteresis in far-talker detection. (The speakerphone
state machine has a built-in hysteresis mechanism to prevent
fluctuations in the talker identification process i.e., identifying the
active side.) The value of this parameter is a dimensionless
number, which should be evaluated during the tuning process for
specific hardware.
Larger values for the parameter correspond to a wider hysteresis
loop. Negative values increase the probability that the state
machine remains in the last state.
Legal values: –127 to 127.
Note: this parameter is represented as a signed byte in the system.
When reading its value with the GTUNE command, ignore the
upper byte of the returned value.
Controls the sensitivity of the system. Low values correspond to high
sensitivity, with a greater false alarm probability (i.e., an echo is
considered a real talker).
High values correspond to low sensitivity, with slower switching. This
parameter is affected by the loop gain and the specific hardware
characteristics.
Legal values: 0 to 127.
Controls the sensitivity of the system. Low values correspond to high
sensitivity, with a greater false alarm probability (i.e., an echo is
considered a real talker).
High values correspond to low sensitivity, with slower switching. This
parameter is affected by the loop gain and the specific hardware
characteristics.
Legal values: 0 to 127.
Controls the maximum attenuation level of the speakerphone
suppressors. It affects the speakerphone stability and its subjective
quality. The maximum attenuation is calculated according to:
Legal values: 550 to 32000.
Controls the energy level at which DTMF, and other tones, are
generated to the line (codec 0) while the speakerphone is active.
Each unit represents 3 dB.
Legal values: 0 to 10.
Note: the energy level at which the tones are generated to
the speaker (codec 1) while the speakerphone is active, is
controlled by the TONE_GEN_LEVEL tunable parameter and
the vol_level.
Note: vol_level is controlled by the VC command.
SP_BLOCK_LEVEL/2
28
Description
ISD-T360SB
10
73
82
10922
6
Default
2-61