System method and computer program product for improved narrow band signal detection for echo cancellation
US6765971B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 8, 2000 |
| Grant date | Jul 20, 2004 |
| Priority date | — |
| Expiry date | Jan 9, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/082
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A digital signal detection system, method and computer program product, including (a) partitioning a digital signal into a plurality of frames; (b) calculating a number of zero crossings of the digital signal within each frame; (c) determining whether or not an absolute value of a difference of the number of zero crossings in between frames is less than a first predetermined value; (d) determining whether or not a sum of the zero crossings of the frames is greater than or equal to a second predetermined value and less than or equal to a third predetermined value; (e) calculating a maximum amplitude of the digital signal for each of the frames; (f) calculating an average amplitude of the digital signal for all of the frames; (g) determining whether or not an absolute value of a difference between the maximum amplitude of a frame and the average amplitude is less than a fourth predetermined value times the average amplitude for each of the frames; and (h) determining that a frame contains a narrowband digital signal if the determining steps (c), (d), and (g) are met. The system, method and computer program product are applicable to signal detection circuits, echo cancellation circuit…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.