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8.6. ANALOG CIRCUIT
This circuit performs the setting of the call path/vol. adjustment in each call mode by a built-in DSP of VoIP (IC1).The audio gain
of each call is determined by download data from PBX or by internal data from flash memory (IC3).
See 17.3. ANALOG/KEY/LED block
1.
Handset Call
Transmitting signal is inputted from handset microphone, and amplified by IC14 and IC18
→
inputted to IC1-pin112
→
A/D
conversion and Gain adjustment by a built-in DSP of IC1
→
then sent to PBX.
Transmitting signal inputted from handset microphone is controlled by transmission switching SW IC16 as follows;
IC16-pin5 L: Handset Call
(IC16-pin5 H: Headset Call)
Transmitting signal inputted from handset microphone is controlled by transmission switching SW IC16 as follows;
Receiving signal inputted from PBX
→
Gain adjustment by a built-in DSP of IC1
→
D/A conversion and outputted from IC1-
pin115.
→
Amplified by IC17 and IC19, and outputted to handset.
2.
Headset Call
Transmitting signal is inputted from headset microphone, and amplified by IC14 and IC18
→
inputted to IC1-pin112
→
A/D
conversion and Gain adjustment by a built-in DSP of IC1
→
then sent to PBX.
Transmitting signal inputted from headset microphone is controlled by transmission switching SW IC16 as follows;
IC16-pin5 H: Headset Call
(IC16-pin5 L: Handset Call)
Receiving signal inputted from PBX
→
Gain adjustment by a built-in DSP of IC1
→
D/A conversion and outputted from IC1-
pin115.
→
Amplified by IC17 and IC19, and outputted to headset.
3.
Speakerphone Call
Speakerphone call realizes all double-call by a built-in DSP (echo canceller) of IC1. For a call in the most appropriate condition,
DSP checks voice level of the calling party, acoustics in a room, voice level of the other party and state of the line of contact,
and cancels echo in transmitting and receiving at the start of calling. It operates in a half double-call state in a few seconds for
the check.
Transmitting signal is inputted from microphone and amplified by IC15
→
A/D conversion and Gain adjustment by a built-in DSP
of IC1, then sent to PBX through echo canceller.
Receiving signal inputted from PBX
→
Gain adjustment by DSP through a built-in echo canceller of IC1
→
D/A conversion and
outputted from IC1-pin116
→
Amplified by IC14 and outputted from IC11 (Amp) to speaker.
Power Amp IC11 is controlled as follows;
IC11-pin1 L
→
ON
IC11-pin1 H
→
OFF
15
KX-NT265X / KX-NT265X-B
Summary of Contents for KX-NT265X
Page 14: ...KX NT265X KX NT265X B 14 ...
Page 17: ...17 KX NT265X KX NT265X B ...
Page 18: ...9 TROUBLESHOOTING GUIDE 9 1 NO OPERATION 18 KX NT265X KX NT265X B ...
Page 19: ... Note Refer to waveform 1 3 and 6 in 17 4 WAVEFORM P 48 19 KX NT265X KX NT265X B ...
Page 20: ...20 KX NT265X KX NT265X B ...
Page 22: ...9 3 HANDSET DOES NOT WORK Receive Send 22 KX NT265X KX NT265X B ...
Page 23: ...9 4 HEADSET DOES NOT WORK Receive Send 23 KX NT265X KX NT265X B ...
Page 24: ...9 5 SPEAKER PHONE DOES NOT WORK Receive Send 24 KX NT265X KX NT265X B ...
Page 35: ...11 TERMINAL GUIDE OF ICs TRANSISTORS AND DIODES 35 KX NT265X KX NT265X B ...
Page 37: ...13 CABINET AND ELECTRICAL PARTS LOCATION 37 KX NT265X KX NT265X B ...
Page 38: ...14 ACCESSORIES AND PACKING MATERIALS 38 KX NT265X KX NT265X B ...
Page 50: ...IC13 pin2 DATA IC13 pin3 CLK IC13 pin4 LCK 13 LED CIRCUIT 50 KX NT265X KX NT265X B ...