Title:
CALLING GENERATOR CIRCUIT AND LINE CARD FOR APPLYING GENERATION OF CALLING AND METHOD THEREFOR
Document Type and Number:
Japanese Patent JP3892070
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a call generator circuit for simultaneously generating calling outputs for plural telephone sets.
SOLUTION: A calling generator circuit 20 includes a switch 32 for receiving an oscillation signal in response to the on state of an on/off signal. The on/off signal is related with whether or not an incoming telephone calling is directed to one of plural telephone sets. The calling generator circuit includes a DC offset circuit 40 for receiving a DC input potential, an amplifier stage 37 for applying a calling output, and a feedback circuit 39 connected between a calling output 38 of the amplifier stage 37 and an output 34 of the switch 32.
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Inventors:
Herbert MKay Chen
Application Number:
JP29528495A
Publication Date:
March 14, 2007
Filing Date:
November 14, 1995
Export Citation:
Assignee:
ADVANCED MICRO DEVICES INCORPORATED
International Classes:
H04M3/02; H03F3/347; H04M3/00; H04M19/02; (IPC1-7): H04M3/02; H04M3/00
Domestic Patent References:
| JP55161457A | ||||
| JP60148260A | ||||
| JP63110855A | ||||
| JP60165156A | ||||
| JP4218725A |
Attorney, Agent or Firm:
Kuro Fukami
Toshio Morita
Hidehiko Ito
Yutaka Horii
Toshio Morita
Hidehiko Ito
Yutaka Horii