Voice band expander and expansion method, and voice communication apparatus
US8396703B2 · kind B2 · utility
0Cited by
3References
15Claims
0Family size
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Key dates
| Filing date | Mar 5, 2009 |
| Grant date | Mar 12, 2013 |
| Priority date | — |
| Expiry date | May 20, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L21/038
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A band-limited voice signal is processed to reduce its spectral envelope or harmonic structure, or both. The resulting reduced signal is moved into a frequency band above the upper limit frequency of the band-limited voice signal, and then combined with the band-limited voice signal to form a band expanded signal with improved quality and comprehensibility, free of unnatural high-frequency resonances and unnaturally strong high-frequency harmonics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.