Back to results
US 2015/0312676 A1Published application
System and method for reducing latency in transposer-based virtual bass systems
AssigneeDolby International AB
InventorPer Ekstrand
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeDolby International AB
InventorPer Ekstrand
Estimating the term…
A latency reduction system in a virtual bass processing system performs harmonic transposition on low frequency components of an audio signal to generate transposed data indicative of harmonics of the audio signal. The system uses a base transposition factor greater than two, and generates the harmonics in response to frequency-domain values determined by forward and inverse transform stages that use asymmetric analysis and synthesis windows. The system combines a virtual bass signal with the delayed wide band audio signal through analysis filter banks having filter coefficient truncated Nyquist filters. The virtual bass signal may lag the delayed wide band audio signal when combining with the audio signal to further reduce the latency caused by the harmonic transposition. The virtual bass input signal may be directly routed from a CQMF analysis filter bank of a preceding Hybrid filter bank stage, in order to avoid the delay associated with a Nyquist filter bank.
A method of generating low latency virtual bass, comprising:
An apparatus for generating low latency virtual bass, comprising:
Dependencies are inferred from the claim text.