| US 9,812,150 B2 | ||
| Methods and systems for improved signal decomposition | ||
| Elias Kokkinis, Patras (GR); and Alexandros Tsilfidis, Athens (GR) | ||
| Assigned to ACCUSONUS, INC., Lexington, MA (US) | ||
| Filed by ACCUSONUS, INC., Lexington, MA (US) | ||
| Filed on Aug. 28, 2013, as Appl. No. 14/11,981. | ||
| Prior Publication US 2015/0066486 A1, Mar. 5, 2015 | ||
| Int. Cl. G10L 21/0272 (2013.01); G10L 19/008 (2013.01) | ||
| CPC G10L 21/0272 (2013.01) [G10L 19/008 (2013.01)] | 21 Claims |
| 1. A method of digital signal decomposition to identify components of a source signal from one or more musical instruments
comprising:
obtaining a first representation of the source signal, during a first time period, which is a mixture of a first active signal
and one or more second active signals, wherein the first active signal and second active signal are audio signals from the
one or more musical instruments;
calculating a time-frequency transformation of the first representation;
obtaining a second representation of the source signal, during a second time period, which comprises the first active signal
captured in isolation of at least one of the one or more second active signals present in the first representation;
calculating a time-frequency transformation of the second representation, wherein the first and second time periods do not
overlap;
appending the time-frequency transformation of the second representation to the time-frequency transformation of the first
representation to form an extended time-frequency transformation;
applying a decomposition technique to the extended time-frequency transformation to extract decomposed components of the source
signal; and
audibly outputting a combination of one or more time domain signals related to the decomposed components of the source signal.
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