FIELD: physics, acoustics.
SUBSTANCE: invention relates to systems for encoding audio signal sources. Provided is subband block-based harmonic transposition, where the time block of complex discrete values of subbands is processed by common phase modification. 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. In one embodiment, the invention further includes a window function suitable for use with cross product-enhanced, subband block-based HFR. A hardware embodiment may include an analysing filter unit (101), a control data-configurable subband processing module (102) and a synthesising filter unit (103).
EFFECT: efficient implementation of high-frequency reconstruction (HFR) through enhancement with cross products, where a new component with frequency QΩ+rΩ0 is generated based on existing components with frequencies Ω and Ω+Ω0.
63 cl, 9 dwg
