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12
KX-NCP1170XJ
• 2W-4W converting circuit
This circuit converts between the 2-line audio signal of APT or SLT and the 4-line audio signal on CODEC.
The audio signal from SLT is input to the differential amplifying circuit of IC302 (1, 2, and 3 pin) by way of C55 and C56, and its
output is input to CODEC.
CODEC output is issued to SLT in the form of the synthesis of the signal that is output through by way of R63 and the one that is
reversely output by IC302 (5, 6, and 7 pin). Programmable frequency characteristic adjusting filter, sidetone removing filter, and
return loss compensating filter are included in CODEC.
The audio signal from SLT is input to the differential amplifying circuit of IC302 (1, 2, and 3 pin) by way of C55 and C56, and its
output is input to CODEC.
CODEC output is issued to SLT in the form of the synthesis of the signal that is output through by way of R63 and the one that is
reversely output by IC302 (5, 6, and 7 pin). Programmable frequency characteristic adjusting filter, sidetone removing filter, and
return loss compensating filter are included in CODEC.
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