Sound event processing with echo analysis

Details Sound event processing with echo analysis Sound event processing with echo analysis

2005-03-30

2010-10-26

Matar, Ahmad F (Department: 2614)

Telephonic communications

Echo cancellation or suppression

C379S406030, C379S406060

Reexamination Certificate

active

07822192

ABSTRACT:
Apparatus, methods, and machine-readable articles of manufacture enable a telephone system to distinguish between actual events and echoes. Events may include conferees' voice and DTMF commands. In selected embodiments, the system categorizes an event received on one channel as a real event if the energy of the event's waveform is greater than concurrent energy of every other channel of the same conference. Otherwise, the event is stored. When the system receives a new event of the same type on a channel of the same conference during a predetermined period, it compares the energies of the new and stored events. If the energy of the new event exceeds that of the stored event, the new event becomes the stored event, and the old stored event is ignored. At the end of the period, the stored event is categorized as a real event and forwarded to appropriate application code.

REFERENCES:
patent: 5675644 (1997-10-01), Sih
patent: 6810116 (2004-10-01), Sorensen et al.
patent: 7136471 (2006-11-01), Johnson
patent: 2002/0172342 (2002-11-01), O'Malley et al.
patent: 2003/0223573 (2003-12-01), Tahernezhaadi
patent: 2005/0262249 (2005-11-01), Koskelainen

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