A new bit-allocation algorithm for AAC encoder based on linear prediction

This paper proposed a new bit-allocation algorithm based on linear prediction for AAC (advanced audio coding) audio encoder. Initial value of bit-allocation information of current audio frame is calculated by linear prediction algorithm using the information of previous two audio frames. Because the number of iteration for bit-allocation module is high correlated with initial value of bit-allocation information, the number of iteration can be decreased by properly setting initial value of bit allocation information such as global scale factor. Therefore it has improved audio encoding performance while decreasing computational complexity of bit-allocation module. Implementation results show that our approach has decreased the number of iteration and increased AAC encoding speed.