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KX-TDA6178
5.2.4.
2W-4W Conversion
It converts 4W-VOX signal used in the PBX to 2W-VOX signal used in SLT, and vice versa. It consists of an operational amplifier in
the SLIC and a balanced network (B/N) in the CODEC. It can control the return loss of the audio data and frequency characteristics.
By modifying the CODEC program, it can match the corresponding impedance.
5.2.5.
DTMF Signal Detection
Each port has its own DTMF receiver in the codec.
Detection of DTMF signal by Codec transmits this data to the MPR via the FPGA.
Via the FPGA, MPR reads the DTMF signal which is received in the Codec.
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