Telephonic communications – Supervisory or control line signaling – Signal receiver
Reexamination Certificate
2006-04-25
2006-04-25
Kuntz, Curtis (Department: 2643)
Telephonic communications
Supervisory or control line signaling
Signal receiver
C379S283000, C379S284000, C379S286000
Reexamination Certificate
active
07035394
ABSTRACT:
A tone transmission part transmits a tone signal. A tone signal detection part detects data representing an echo signal of the tone signal transmitted by the tone transmission part, and detects data representing a predetermined tone signal targeted to be detected. The tone signal detection part also detects data representing tone signals of all of input signals. A tone judgment part excludes the data representing the echo signal from the data representing the tone signals of all of the input signals so as to judge a detection of the predetermined tone signal.
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Dickstein , Shapiro, Morin & Oshinsky, LLP
Kuntz Curtis
Pham Tuan
Ricoh & Company, Ltd.
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