Patent ID: 8457958
Filing Date: 2013-06-04
Classification: G10L

Abstract:
1. A method of transcoding an audio bitstream from an initially coded bit-rate to a target bit-rate using a computing system that implements an audio transcoder, the computing system including a processing unit and memory, the method comprising: receiving the audio bitstream, the audio bitstream containing encoded data that represents audio content of an audio input signal, wherein the audio bitstream also contains encoding parameters generated by an audio encoder when encoding the audio input signal to produce the audio bitstream, wherein at least some of the encoding parameters are derived from the audio input signal, wherein the encoding parameters include rate control parameters that parameterize a quality to quantization step size curve, and wherein the rate control parameters comprise a plurality of anchor points on the quality to quantization step size curve; with the computing system that implements the audio transcoder, decoding the encoding parameters from the audio bitstream; with the computing system that implements the audio transcoder, partially decoding the audio content of the audio bitstream to an intermediate decoding stage prior to an inverse frequency transform; and with the computing system that implements the audio transcoder, re-encoding the partially-decoded audio content, based on the encoding parameters, to produce an output bitstream at the target bit-rate.