AUDIO CODER, AUDIO DECODER, AND AUDIO PROCESSOR HAVING A DYNAMICALLY CHANGING CHARACTERISTIC

摘要

1. An audio encoder for encoding an audio signal comprising! a pre-filter for generating a pre-filtered audio signal, the pre-filter having a variable skew characteristic, the skew characteristic being controlled in response to a time-varying control signal, the control signal indicating a skew characteristic or lack thereof, or a relatively high skew characteristic; ! a controller for providing a time-varying control signal, the time-varying control signal being dependent on the audio signal; and! a controllable encoding processor for processing a pre-filtered audio signal to obtain an encoded audio signal, in which the encoding processor is configured to process a pre-filtered audio signal in accordance with a first encoding algorithm adapted to a specific signal structure or in accordance with a second, different encoding algorithm suitable for encoding common audio signal. ! 2. The audio encoder according to claim 1, wherein the encoding processor is configured to use at least a portion of the speech encoding algorithm as the first encoding algorithm. ! 3. The audio encoder according to claim 1, wherein the encoding processor is configured to use the residual data / excitation encoding algorithm as part of the first encoding algorithm, wherein the residual data / excitation encoding algorithm includes a code linear prediction (CLCR) encoding algorithm, multi-pulse excitation coding algorithm