Patent ID: 8275626

Claim:
An apparatus for decoding an encoded audio signal, the encoded audio signal comprising a first portion encoded in accordance with a first encoding algorithm, a second portion encoded in accordance with a second encoding algorithm, BWE parameters for the first portion and the second portion and a coding mode information indicating a first decoding algorithm or a second decoding algorithm, comprising: a first decoder for decoding the first portion in accordance with the first decoding algorithm for a first time portion of the encoded signal to acquire a first decoded signal, wherein the first decoder comprises an LPC-based coder; a second decoder for decoding the second portion in accordance with the second decoding algorithm for a second time portion of the encoded signal to acquire a second decoded signal, wherein the second decoder comprises a transform-based coder; a BWE module comprising a controllable crossover frequency, the BWE module being configured for performing a bandwidth extension algorithm using the first decoded signal and the BWE parameters for the first portion, and for performing a bandwidth extension algorithm using the second decoded signal and the bandwidth extension parameter for the second portion, wherein the BWE module is configured to use a first crossover frequency for the bandwidth extension for the first decoded signal and to use a second crossover frequency for the bandwidth extension for the second decoded signal, wherein the first crossover frequency is higher than the second crossover frequency; and a controller for controlling the crossover frequency for the BWE module in accordance with the coding mode information, wherein at least one of the first decoder, the second decoder, the BWE module and the controller comprises a hardware implementation.