HIGH IMPEDANCE ABSOLUTE TELEPHONE LINE VOLTAGE MEASUREMENT CIRCUIT

HIGH IMPEDANCE ABSOLUTE TELEPHONE LINE VOLTAGE MEASUREMENT CIRCUIT

A TELEPHONE LINE MEASUREMENT CIRCUIT (40) IS DISCLOSED FOR DETECTING A VARIATION OF A CHARACTERISTIC BETWEEN A FIRST AND A SECOND LEADS OF A TELEPHONE LINE. THE CIRCUIT COMPRISES A FIRST CIRCUIT (41) HAVING A FIRST AND A SECOND INPUTS AND AN OUTPUT (63). THE CIRCUIT ALSO HAS A SECOND CIRCUIT HAVING...

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Bibliographische Detailangaben
1. Verfasser: LINMEI SHU
Format: Patent
Sprache:eng
Schlagworte:
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
TELEPHONIC COMMUNICATION
TESTING
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Zusammenfassung:A TELEPHONE LINE MEASUREMENT CIRCUIT (40) IS DISCLOSED FOR DETECTING A VARIATION OF A CHARACTERISTIC BETWEEN A FIRST AND A SECOND LEADS OF A TELEPHONE LINE. THE CIRCUIT COMPRISES A FIRST CIRCUIT (41) HAVING A FIRST AND A SECOND INPUTS AND AN OUTPUT (63). THE CIRCUIT ALSO HAS A SECOND CIRCUIT HAVING (42) A FIRST AND A SECOND INPUTS AND AN OUPUT. THE FIRRST INPUT OF THE FIRST CIRCUIT AND THE SECOND INPUT OF THE SECOND CIRCUIT ARE COUPLED TO THE FIRST LEAD OF THE TELEPHONE LINE AND THE SECOND INPUT OF THE FIRST CIRCUIT AND THE FIRST INPUT OF THE SECOND CIRCUIT ARE AOUPLED TO THE SECOND LEAD THE TELEPHONE LINE. THE OUTPUTS OF THE FIRST AND THE SECOND CIRCUITS ARE THEN COUPLED TOGETHER TO PROVIDE AN OUTPUT (63) FOR THE MEASUREMENT CIRCUIT (40).(FIGURE 4)