Method and apparatus for inband testing of an echo canceller

Details Method and apparatus for inband testing of an echo canceller Method and apparatus for inband testing of an echo canceller

2005-08-16

2005-08-16

Tran, Sinh (Department: 2644)

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of hybrid or echo suppressor or canceller

C379S406020, C379S406040, C370S286000

Reexamination Certificate

active

06931101

ABSTRACT:
Provided is a method and apparatus for inband testing of an echo canceller. The apparatus includes a signal generator for generating an excitation signal including a preamble portion and a test portion. The echo canceller receives the excitation signal at a decoder. The decoder differentiates the preamble from the test portion and obtains control information by decoding the preamble portion. A controller configures the echo canceller during testing according to the control information obtained from the preamble portion. A strength of the present invention is that the preamble portion allows precise control of the echo canceller during testing by synchronizing the test control to the location of the preamble. This allows exacting control of the echo canceller during testing to within a single sample time of the excitation signal, e.g., 125 microseconds. The control information includes any of the following: instructions related to the management of the H-register, instructions related to the management of the non-linear processor, instructions related to an adaptation function in the echo canceller, and timing information related to any of the aforementioned instructions. The preamble further identifies the test to be performed on the echo canceller and the type of test portion.

REFERENCES:
patent: 4918685 (1990-04-01), Tol et al.
patent: 5274705 (1993-12-01), Younce et al.
patent: 5533121 (1996-07-01), Suzuki et al.
patent: 5745564 (1998-04-01), Meek
patent: 6011783 (2000-01-01), Interrante et al.
patent: 6400802 (2002-06-01), Legare
patent: 6487200 (2002-11-01), Fraser
patent: 6751761 (2004-06-01), Tendo
Telecommunication Standardization Sector of International Telecommunication Union, Recommendation G.165, Rev. Mar. 1993.
Telecommunication Standardization Sector of International Telecommunication Union, Recommendation P.501, Rev. Aug. 1996.
Telecommunication Standardization Sector of International Telecommunication Union, Recommendation G.168, Rev. Apr. 1997.

Affiliated with

Also associated with

Rating

Method and apparatus for inband testing of an echo canceller does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for inband testing of an echo canceller, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for inband testing of an echo canceller will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3461662