Extracting a common signal from multiple audio signals
US9820073B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 10, 2017 |
| Grant date | Nov 14, 2017 |
| Priority date | — |
| Expiry date | May 10, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S2400/07
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Extracting a common signal from multiple audio signals may include summing a first signal and a second signal to obtain a first+second signal; subtracting the second signal from the first signal to obtain a first−second signal; transforming the first+second signal and the first−second signal to frequency domain representations; calculating absolute value of the frequency domain representations of the first+second signal and the first−second signal; subtracting the absolute value of the frequency domain representation of the first−second signal from the absolute value of the frequency domain representation of the first+second signal to obtain a difference signal; multiplying the difference signal by the frequency domain representation of the first+second signal to obtain a product signal; dividing the product signal by the absolute value of the frequency domain representation of the first+second signal to obtain a frequency domain representation of the common signal; and transforming the frequency domain representation to the common signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.