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
OG exemplary drawing
 
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.