Digital audio precompensation

Abstract

The invention concerns digital audio precompensation, and particularly the design of digital precompensation filters. The invention proposes an audio precompensation filter design scheme that uses a novel class of design criteria. Briefly, filter parameters are determined based on a weighting between, on one hand, approximating the precompensation filter to a fixed, non-zero filter component and, on the other hand, approximating the precompensated model response to a reference system response. For design purposes, the precompensation filter is preferably regarded as being additively decomposed into a fixed, non-zero component and an adjustable compensator component. The fixed component is normally configured by the filter designer, whereas the adjustable compensator component is determined by optimizing a criterion function involving the above weighting. The weighting can be made frequency- and / or channel-dependent to provide a very powerful tool for effectively controlling the extent and amount of compensation to be performed in different frequency regions and / or in different channels.

Description

technical field [0001] This invention relates generally to digital audio precompensation and, more particularly, to the design of digital precompensation filters which produce one or more input signals to a sound generating system by modifying the dynamic response of the system being compensated. Background technique [0002] Systems used to produce or reproduce sound, including amplifiers, cables, and speakers, often affect the spectral characteristics of the sound in undesired ways. The reverberation of the room in which this device is placed will add an additional improvement. Sound reproduction with very high quality can be achieved by using matching cable sets, amplifiers and high quality speakers, but this is cumbersome and very expensive. The increased computational power of PCs and digital signal processors introduces new possibilities for improving the properties of sound production or sound reproduction systems. The dynamic properties of a sound producing system ...

AI Technical Summary

Problems solved by technology

However, all of these given methods suffer from serious difficulties which make the practical use of these methods rather problematic

Design solutions available in the prior art often lead to compensation filters with high computational complexity and severe practical limitations

The resulting auto-generated compensation filter is sometimes even dangerous for audio equipment due to the risk of generating the compensation signal with too high a power

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