isd-t360sb ETC-unknow, isd-t360sb Datasheet - Page 95

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

2—SOFTWARE
ISD
31
32
34
35
Index
Acoustic Echo Canceler
(AEC):
SP_AEC_PRIORITY_BIAS
Acoustic Echo Canceler
(AEC):
SP_AEC_COUPLING_
LOSS_THRESHOLD
Acoustic Echo Canceler
(AEC):
SP_AEC_LR_LEVEL
Electric Echo Canceler
(EEC):
SP_EEC_LR_LEVEL
Parameter Name
Table 2-9: TUNABLE PARAMETERS: Speakerphone
Controls the bias in priority between the Send and Receive paths.
If send priority-bias is preferred, the value should be greater than
zero.
For no priority bias, the value should be zero.
For priority bias for the Receive path, the value should be negative.
Steps are 3 dB each (e.g., +3 is 9 dB bias for the Send path, –2 is 6
dB bias for the Receive path).
Legal values: –4 to 4.
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.
This parameter limits the acoustic return loss. Its value
(SP_AEC_COUPLING_LOSS_THRESHOLD / 32767) is compared with
the RMS value of S
single-talk event. The loop gain is decreased, if necessary, to
control the TCL level.
For SP_AEC_COUPLING_LOSS_THRESHOLD = 32767 this loop is
disabled.
Legal values: 0 to 32767.
Controls the speakerphone gain from the microphone to the line-
out. The total attenuation, or gain, depends on both the analog
gain and this value. The gain is:
where:
Legal values: 0 to 16000.
Controls the speakerphone gain from the line-in to the speaker. The
total attenuation, or gain, depends on both the analog gains and
this value. The gain is:
where:
(vol_level is controlled by the VC command)
Legal values: 0 to 400.
K * signal
K = SP_AEC_LR_LEVEL/4096.
K * signal
K = (SP_EEC_LR_LEVEL/4096) * (2
out
divided by the RMS value of R
Description
(6 + vol_level)/2
)
in
, during a
ISD-T360SB
0
2047
14000
281
Default
2-59