Design of low power AAC Audio decoder for MPEG-4 which has vast application in recent electronics gazettes. When developing audio coder speed, quality and power consumption these are three important aspects. It is observed that most of researchers have given less concentration to implement efficient algorithm in MPEG-4 AAC Audio decoder. Hence, here we use efficient algorithm in the design of MPEG-4 Advance Audio decoder to improve overall speed & power consumption.

Many algorithms have been design in order toaccomplish an improved the performance of the filters by using the convolution design. The architecture of the proposed RISC CPU is a uniform 32-bit instruction format, single cycle nonpipelined processor. It has load/store architecture, where the operations will only be performed on registers, and not on memory locations. It follows the classical von-Neumann architecture with just one common memory bus for both instructions and data. A total of 27 instructions are designed in initial development step of the processor. The instruction set consists of Logical, Immediate, Jump, Load, store and HALT type of instruction. The combined advantages RISC processor such as high speed, low power, area efficient and operationspecific design possibilities have been analyzed.In this paper we have implemented 32 bit RISC processor to perform circular convolution at different modules of RISC processor like execute unit along with ALU, Instruction fetch along with instruction memory, decode unit, resistor unit, data memory has been implemented.The execution time to perform 4 bit circular convolution is found to be 270 ns. The execution time to execute the instruction is found to be 5 ns. In our paper, 3200 LUTs and 320 logic elements are used to implement 32 bit RISC processor which is found to be area efficient as compared to various designs.