发明名称 |
Attenuation and termination circuit using impedance synthesis |
摘要 |
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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申请公布号 |
US8472614(B2) |
申请公布日期 |
2013.06.25 |
申请号 |
US20090644201 |
申请日期 |
2009.12.22 |
申请人 |
POULIS SPIRO;EVANS JOHN;MESSERLY SHAYNE;HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. |
发明人 |
POULIS SPIRO;EVANS JOHN;MESSERLY SHAYNE |
分类号 |
H04M1/00;H04M9/00 |
主分类号 |
H04M1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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