US 12,254,863 B2
Method and system for generating harmonics as well as an amplitude proportional harmonics unit for virtual bass systems
Søren Skovgaard Christensen, Dyssegaard (DK); Pedro Højen-Sørensen, Allerød (DK); Morten Rolle Hansen, Hellerup (DK); and Johannes Röjder, Uppsala (SE)
Assigned to DIRAC RESEARCH AB, Uppsala (SE)
Appl. No. 18/246,018
Filed by DIRAC RESEARCH AB, Uppsala (SE)
PCT Filed Sep. 21, 2021, PCT No. PCT/SE2021/050904
§ 371(c)(1), (2) Date Mar. 20, 2023,
PCT Pub. No. WO2022/066085, PCT Pub. Date Mar. 31, 2022.
Claims priority of provisional application 63/083,363, filed on Sep. 25, 2020.
Prior Publication US 2023/0360630 A1, Nov. 9, 2023
Int. Cl. G10K 15/02 (2006.01); G10K 11/178 (2006.01)
CPC G10K 15/02 (2013.01) [G10K 11/17853 (2018.01)] 20 Claims
OG exemplary drawing
 
1. A system for generating harmonics, said system comprising:
an input for receiving an input signal having a fundamental frequency;
at least two signal paths:
a first signal path configured to receive the input signal and configured to generate a first amplitude proportional signal comprising one or more harmonics components based on the input signal, said first amplitude proportional signal having an amplitude proportional to the amplitude of the input signal;
a second signal path configured to receive the input signal, said second signal path comprising at least one signal processing block configured to i) generate a normalized signal based on the input signal, said normalized signal having an amplitude independent of the amplitude of the input signal, and ii) multiply the normalized signal with the first amplitude proportional signal to generate a second amplitude proportional signal comprising one or more harmonics components; and
a combiner configured to generate an output signal based on the first amplitude proportional signal comprising one or more harmonics components and the second amplitude proportional signal comprising one or more harmonics components,
wherein said second signal path comprises:
a SIGN unit for generating a sequence of changing signs alternating at a rate dictated by the fundamental frequency of the input signal,
a filtering unit configured to filter the sequence of changing signs to generate the normalized signal having an amplitude independent of the amplitude of the input signal, and
a mixing multiplier configured to multiply the normalized signal with the first amplitude proportional signal to generate the second amplitude proportional signal.