Technique for compensating for signal attenuation on a telephone

Details Technique for compensating for signal attenuation on a telephone Technique for compensating for signal attenuation on a telephone

1997-06-24

1999-03-30

Hunter, Daniel S.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379400, 379401, 379399, 379340, 381 77, 381 78, 381 82, H04M 100, H04B 300

Patent

active

058898549

ABSTRACT:
An apparatus compensates for an attenuation of a signal on a telephone line in a communication system connected to the telephone line via a transformer. A photo coupler detects a loop current at a primary winding of the transformer. A controller generates switching control signals corresponding to an output of the photo coupler based on a predetermined switching table, and controls an overall operation of the communication system by receiving coding data. A level amplifier having different gains amplifies a signal at a secondary winding of the transformer by the gain corresponding to the switching control signal. A coder codes an output from the level amplifier to generate the coding data.

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