ISD-T360 ETC [List of Unclassifed Manufacturers], ISD-T360 Datasheet - Page 100
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ISD-T360
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]
Datasheet
1.ISD-T360.pdf
(109 pages)
- Current page: 100 of 109
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Index
Electric Echo Canceler
(EEC):
SP_EEC_CLIP_POS
Electric Echo Canceler
(EEC):
SP_EEC_CLIP_NEG
Electric Echo Canceler
(EEC):
SP_EEC_ENABLE
Electric Echo Canceler
(EEC):
SP_EEC_VOX_HYST
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
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. 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.
Enables/disables the electrical echo controller.
Legal values: 0 (disable), 1 (enable).
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.
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
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.
SP_BLOCK_LEVEL/2
SP_TONE_GEN_LEVEL
28
Description
10.
Voice Solutions in Silicon™
16000
–16000
1
10
82
10922
6
Default
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