Telephone battery feed circuit including noise reduction...

Details Telephone battery feed circuit including noise reduction... Telephone battery feed circuit including noise reduction...

H - Electricity

04

M

H04M 19/06 (2006.01) H04M 19/00 (2006.01)

Patent

CA 2155999

Undesired noise signals associated with the battery utilized in a telephone battery feed circuit are minimized. In one embodiment, the noise voltage is amplified and inverted in phase and added back to a location on the ring line in order to provide substantial cancellation of the original noise voltage which would have appeared at the same location. In another embodiment, the noise voltage coupled to the ring line is reproduced as a replica signal. The replica signal is added in series with the tip line so as to provide equal phase and magnitude relationships relative to earth ground, thereby effectively canceling the noise current which would have flowed from the original noise source.

Réduction au minimum des signaux de bruit non désirés associés à la batterie utilisée dans un circuit d'alimentation de téléphone. Dans une des réalisations, la tension de bruit est amplifiée, et sa phase, inversée, puis la tension est réinjectée dans la ligne de nuque afin d'assurer une réduction considérable de la tension de bruit d'origine qui se serait produite au même emplacement. Dans une autre réalisation, la tension de bruit couplée à la ligne de nuque est reproduite comme signal de réplique. Ce signal est mis en série avec la ligne de tête de façon à produire des relations de même phase et de même valeur par rapport à la terre, ce qui élimine efficacement le courant de bruit qui aurait circulé à partir de la source de bruit d'origine.

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