isd-t360sb ETC-unknow, isd-t360sb Datasheet - Page 96
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isd-t360sb
Manufacturer Part Number
isd-t360sb
Description
Manufacturer
ETC-unknow
Datasheet
1.ISD-T360SB.pdf
(112 pages)
- Current page: 96 of 112
- Download datasheet (2Mb)
ISD-T360SB
2-60
36
37
38
39
43
Index
Acoustic Echo Canceler
(AEC):
SP_AEC_CLIP_POS
Acoustic Echo Canceler
(AEC):
SP_AEC_CLIP_NEG
Electric Echo Canceler
(EEC):
SP_EEC_CLIP_POS
Electric Echo Canceler
(EEC):
SP_EEC_CLIP_NEG
Acoustic Echo Canceler
(AEC):
SP_AEC_VOX_HYST
Parameter Name
Table 2-9: TUNABLE PARAMETERS: Speakerphone
Specifies the positive peak-value at which the analog circuit of the
speaker saturates. Codec analog full scale corresponds to µLAW
full scale values after expansion. Assume that positive saturation
occurs at amplitudes higher than those of a sine wave at X [dBm0].
The SP_AEC_CLIP_POS value is set as:
SP_AEC_CLIP_POS = 32636 * 10
Note: a sine wave with amplitude 4 * 8159 = 32636
corresponds to 3.17 dBm0.
Example:
For X = –6.2761 dBm0, the value is:
SP_AEC_CLIP_POS = 32636 * 10
=11000;
Legal values: 0 to 32767.
Specifies the negative peak value at which the analog circuit of
the speaker saturates. Codec analog full scale corresponds to
µLAW full scale values after expansion.The value of
SP_AEC_CLIP_NEG is set as shown for SP_AEC_CLIP_POS, above.
Legal values: –32768 to 0.
Specifies the positive peak value at which the analog circuit of the
line-out saturates. Codec analog full scale corresponds to µLAW full
scale values after expansion. The value of SP_EEC_CLIP_POS is set
as shown for SP_AEC_CLIP_POS, above.
Legal values: 0 to 32767.
Specifies the negative peak value at which the analog circuit of
the line-out saturates. Codec analog full scale corresponds to
µLAW full scale values after expansion. The value of
SP_EEC_CLIP_NEG is set as shown for SP_AEC_CLIP_POS, above.
Legal values: –32768 to 0.
Controls the hysteresis in near-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.
Description
((–6.2761– 3.17)/20)
((X – 3.17)/20)
= 0.3371 * 32636
Voice Solutions in Silicon™
2—SOFTWARE
16000
–16000
16000
–16000
10
Default
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