isd-t360sb ETC-unknow, isd-t360sb Datasheet - Page 51

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

2—SOFTWARE
EEC
Electric Echo Controller. The part in the speaker-
phone algorithm that controls the echo in the re-
ceive path.
SPEAKERPHONE MODES OF OPERATION
Full-Duplex (ON)
The speakerphone works in full-duplex mode,
meaning both parties can speak and hear each
other simultaneously. In this mode both the
acoustic and electric echo controllers are active.
The VoiceDSP processor tone detectors are not
active in this mode.
Mute
In this mode of operation, the speakerphone gen-
erates silence to the line. The near-end listener
can hear the far-end speaker but not vice versa.
Tone detectors are not active.
Hold
During Hold mode silence is generated to the line
and the speaker, and neither side can hear the
other.
Restart
In Restart mode the speakerphone re-initializes it-
self to the last speakerphone mode (full-duplex,
transparent or mute). This mode should be used to
resume the speakerphone operation when there
is a significant change in the environmental con-
ditions (e.g., parallel pickup) that may affect the
speakerphone quality.
Transparent
While in Transparent mode, the speakerphone
works in full-duplex mode but without echo can-
cellation.
Samples from the microphone are transferred to
the line, and samples from the line are transferred
ISD
to the speaker, with no processing. This mode
should be used only for tuning and testing the sys-
tem.
Silence
In silence mode, only the electric echo cancellor
is active.
Listen
In Listen mode the line is audible on the speaker,
and the processor tone detectors are active.
During Listen mode, dialing with the GT command
and call progress detection are possible, since
the busy and dial tone detectors are active.
The following pseudo-code demonstrates how to
make a call from speakerphone mode:
ISD-T360SB
2-15