Telephonic communications – Supervisory or control line signaling – Signal receiver
Reexamination Certificate
2007-02-27
2007-02-27
Harold, Jefferey F. (Department: 2614)
Telephonic communications
Supervisory or control line signaling
Signal receiver
C379S372000
Reexamination Certificate
active
10359628
ABSTRACT:
The present invention relates to the field of tone detection and, more particularly, to the detection of dual tone multi-frequency (DTMF) tones in software based telecommunications systems. As modem telecommunications systems are becoming increasingly software based and typically require only a minimum of physical hardware, much of the necessary telecommunication functionality is now provided by software functions running on powerful computer servers. A common function which is required to be performed by telecommunications systems is that of dual tone multi-frequency (DTMF) detection. Accordingly, the present invention aims to provide an efficient software-based DTMF detection system that satisfies the ever increasing need for efficient software functions.
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Morlat Simon
Sauvage Pierre
Harold Jefferey F.
Hewlett-Packard Development L.P.
Ladas & Parry LLP
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