Method and apparatus for inclusive echo canceller testing

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Of hybrid or echo suppressor or canceller

Reexamination Certificate

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Reexamination Certificate

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10981832

ABSTRACT:
A testing and performance analysis methodology applies a series of test vector pairs to the input ports of an echo canceller under test. The test vector signal pair may represent a particular speech activity state transition, e.g., a Brady Model transition. A scoring compression function such as a sigmoid squashing function is used to evaluate quantized performance parameters. The sub-scores may be weighted and averaged to provide an overall performance score.

REFERENCES:
patent: 5412754 (1995-05-01), Le Cun et al.
patent: 5602836 (1997-02-01), Papadopoulos et al.
“Digital Network Echo Cancellers,” ITU-T Recommendation G.168, (Apr. 2000).

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