High-frequency noise elimination for use in telephone systems

Details High-frequency noise elimination for use in telephone systems High-frequency noise elimination for use in telephone systems

1996-06-14

1999-03-02

Wolinsky, Scott

Telephonic communications

Substation or terminal circuitry

Sidetone control or hybrid circuit

379387, 379420, H04M 158

Patent

active

058781323

ABSTRACT:
A noise elimination scheme is disclosed which enables the prior established telephones or telephone exchange modules linked thereto to eliminate high-frequency noises as applied from outside portable radiotelephone transceiver units. A choke coil (15) is arranged on a circuit board (2) of a telephone main body (1) at a respective one of several nodes for connection with external communication lines (5). Another choke coil (15) is provided at each interconnection node between the circuit board (2) and signal transmission lines (6) of a telephone handset (10). Respective choke coils (15) have a specific stray capacitance of 0.3 pF or below to insure successful elimination of high frequency noises of at or above 800 MHz.

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H. Meinke and F.W. Gundlach, "Taschenbuch der Hoch-frequenztechnik," edition, Berlin, Gottingen, Heidelberg: Springer Verlag (publishing house), 1962, pp. 27 to 29.

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