Method and apparatus for transmitting white noise for echo cance

Details Method and apparatus for transmitting white noise for echo cance Method and apparatus for transmitting white noise for echo cance

1998-02-25

2000-06-27

Hudspeth, David R.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379406, 375242, 455413, 455570, H04M 119

Patent

active

060815930

ABSTRACT:
A method for transmitting white noise for echo cancellation in the voice mail system (VMS) for providing voice guidance message services to callers connected with switchboard is characterized in that specified ring-back tone signals are transmitted to the switchboard with the white noise being inserted between the ring-back tone signals.

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patent: 5519764 (1996-05-01), Pierce et al.
patent: 5553137 (1996-09-01), Nyhart et al.
patent: 5638436 (1997-06-01), Hamilton et al.
patent: 5859907 (1999-01-01), Kawahara et al.
patent: 5913189 (1999-06-01), Lee et al.

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