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IT- A4000
to the circuit.
When
the fixed record OGM
is not recorded, data RCM
IC823 for voice composition is converted into the analog
signal by IC (IC822)
for voice composition and playback. This signal amplified and input to the speech network
IC, MF
input, and transmitted
to the 'circuit.
2-7-3. Recording message (ICM)
Start to record the ICM
after transmitting
to circuit OGM. The speech network
output
signal is amplified by
IC401 (1/4), converted into the digital signal by CODEC
IC (IC804). Further signal processing is identical to OGM
recording.
2-7-4. ICM recording completion
The following
three procedures
complete
ICM
recording.
1. Call completion by the maximum recording time
Set the maximum
recording time, one or four minutes, by the switch. When the ICM recording time exceeds, DSP
IC releases
the relay and the circuits
using ASIC
IC.
2. Call completion by CPC detection
If CPC is detected when CPC detection switch is ON, the call will be completed.
CPC signal is sent from the switchboard side when the sending side cuts off the call, photocoupler PH302 detects
this signal. The signal from the photocoupler is informed to DSP via buffer IC, IC805, and ASI IC. DSP IC releases
relay RY301
and the circuits using ASIC IC after recognized by DSP.
3. Call completion by detection of silence in the call
The digital signal converted by CODEC
IC (IC804)
in the recording ICM procedure is recognized silent in the
call by DSP IC via ASIC IC (IC802).
DSP releases relay RY301
and the circuits using ASIC IC.
2-7-5. Remote control operation
When
the
answering
machine
is operating,
various
kind
of remote
control
operations
can
be conducted
by
recognizing
the tone signal from
the same
circuit.
(Completion
by detection
of silence in the call.)
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