FIELD: physics.
SUBSTANCE: invention relates to high-frequency reconstruction (HFR), amplified by cross products, where new component with frequency QΩ+rΩ0 is generated based on existing components with frequencies Ω and Ω+Ω0. Harmonic transformation is provided on the basis of unit of subranges, where time unit of complex-valued discrete values of subranges is processed by well-known modification of phases. Superposition of multiple modified discrete values yields the resultant effect of limiting undesirable cross products, making it possible to use coarser frequency resolution and/or lesser degree of oversampling. Hardware version of the invention includes an analysing filter unit (101), a subranges processing module (102) configured with control data (104) and a synthesizing filter unit (103).
EFFECT: reproducing the audio signal with high accuracy provided that the computational costs are reduced.
3 cl, 9 dwg
