Patent ID: 8208622
Filing Date: 2012-06-26
Classification: H04B,H04M

Abstract:
1. Test equipment to test 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 comprising: a first segment associated with a first frequency band of the overall frequency band; a second segment following the first segment and associated with a second frequency band of the overall frequency band, the second frequency band being higher than the first frequency band; a third segment following the second segment 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 fourth segment following the third segment and associated with a fourth frequency band of the overall frequency band, the fourth frequency band being higher than the third frequency band.