20240046940. CROSS PRODUCT ENHANCED SUBBAND BLOCK BASED HARMONIC TRANSPOSITION simplified abstract (DOLBY INTERNATIONAL AB)

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CROSS PRODUCT ENHANCED SUBBAND BLOCK BASED HARMONIC TRANSPOSITION

Organization Name

DOLBY INTERNATIONAL AB

Inventor(s)

Lars Villemoes of Järfälla (SE)

CROSS PRODUCT ENHANCED SUBBAND BLOCK BASED HARMONIC TRANSPOSITION - A simplified explanation of the abstract

This abstract first appeared for US patent application 20240046940 titled 'CROSS PRODUCT ENHANCED SUBBAND BLOCK BASED HARMONIC TRANSPOSITION

Simplified Explanation

The invention described in this patent application is an efficient implementation of cross-product enhanced high-frequency reconstruction (HFR). It introduces a new component at frequency q+r based on existing components at q and q+r. The invention also includes a block-based harmonic transposition technique, where a time block of complex subband samples is processed with a common phase modification. By superimposing several modified samples, the invention limits undesirable intermodulation products, allowing for coarser frequency resolution and/or lower degree of oversampling.

  • The invention provides an efficient implementation of cross-product enhanced high-frequency reconstruction.
  • It generates a new component at frequency q+r based on existing components at q and q+r.
  • The invention includes a block-based harmonic transposition technique.
  • A time block of complex subband samples is processed with a common phase modification.
  • Superposition of several modified samples limits undesirable intermodulation products.
  • This enables the use of coarser frequency resolution and/or lower degree of oversampling.
  • The invention may include a window function suitable for block-based cross-product enhanced HFR.
  • A hardware embodiment of the invention may include an analysis filter bank, a subband processing unit configurable by control data, and a synthesis filter bank.

Potential applications of this technology:

  • High-quality audio and video signal processing.
  • Wireless communication systems.
  • Digital signal processing in various industries.

Problems solved by this technology:

  • Undesirable intermodulation products in high-frequency reconstruction.
  • Limited frequency resolution and oversampling requirements.

Benefits of this technology:

  • Improved efficiency in high-frequency reconstruction.
  • Enhanced audio and video signal quality.
  • Reduced oversampling requirements, leading to cost savings in hardware implementation.


Original Abstract Submitted

the invention provides an efficient implementation of cross-product enhanced high-frequency reconstruction (hfr), wherein a new component at frequency q�+r�is generated on the basis of existing components at � and �+�. the invention provides a block-based harmonic transposition, wherein a time block of complex subband samples is processed with a common phase modification. superposition of several modified samples has the net effect of limiting undesirable intermodulation products, thereby enabling a coarser frequency resolution and/or lower degree of oversampling to be used. in one embodiment, the invention further includes a window function suitable for use with block-based cross-product enhanced hfr. a hardware embodiment of the invention may include an analysis filter bank, a subband processing unit configurable by control data and a synthesis filter bank.

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