Attenuation and termination circuit using impedance synthesis

Details Attenuation and termination circuit using impedance synthesis Attenuation and termination circuit using impedance synthesis

2000-04-28

2010-02-09

Tieu, Binh K (Department: 2614)

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

C379S002000, C379S024000, C379S029040, C379S030000

Reexamination Certificate

active

07660408

ABSTRACT:
The present invention discloses circuits for isolating and attenuating signals generated by a telephone network. In disclosed embodiments, a metering pulse signal is isolated from the terminals of the connecting device, and then attenuated with an impedance that is synthesized with a programmable digital signal processor. Embodiments also utilize the digital signal processor to synthesize a termination impedance for the connecting device. The termination impedance matches closely the characteristic impedance of the network, so as to minimize wave reflections and the like.

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