A Low-Power Reconfigurable Datapath for Advanced Speech Coding Algorithms

The Algebraic Codebook Search (ACS) is a computationally intensive and time consuming process used in modern speech coding techniques such as the 3G mobile network. This paper presents a new low-power generic reconfigurable platform for the Algebraic Codebook Search (ACS) function. The proposed architecture performs the ACS in about 75x times less clock cycles when compared to previous generic and application specific DSP architectures. Furthermore it gives a significant reduction in power dissipation by a factor of 9.7x compared to a DSP while there is an area overhead by a factor of 3.5x.