Patent ID: 7636436
Filing Date: 2009-12-22
Classification: H04B,H04M

Abstract:
1. Test equipment for testing an echo canceller, the test equipment comprising a signal generator to generate a white noise test signal associated with an overall frequency band, the white noise test signal including a plurality of high-level white noise time segments each of which is separated by a low-level white noise time gap, the high-level white noise time segments including at least: a pair of first segments associated with a first frequency band of the overall frequency band; a pair of second segments following the first segments and associated with a second frequency band of the overall frequency band, the second frequency band being higher than the first frequency band; a pair of third segments following the second segments and associated with a third frequency band of the overall frequency band, the third frequency band being higher than the second frequency band; and a pair of fourth segments following the third segments and associated with a fourth frequency band of the overall frequency band, the fourth frequency band being higher than the third frequency band.