ARM9E Core를 이용한 Multimedia용 음성 부호화기의 실시간 구현

Abstract

In this study, the G.729AB/G.723.1 speech codec is implemented, in realtime, using the Intel 400MHz Xscale PXA250 with 32bit RISC processor ARM9E-J�� core. The assembly code for ARM9E-J Core is developed through the serial process of C code optimization, cross compile, assembly code manual optimization and adjusting the optimized code to Embedded Visual C++ platform. C code is trimmed on Visual C++ platform. Cross compile and assembly code manual optimization are performed on CodeWarrior with ARM compiler. Through these four development stages, codes for both ARM EVM board and PDA are produced. The implemented codec is evaluated using 10 test vectors given by ITU-T. Through this evaluation the bit-exactness of the S/W is verified. The average complexity of G.729AB codec is 19.53MCPS for encoder and 3.72MCPS for decoder. In case of static link library (SLL), required memories are 67.03Kbytes. and the average complexity of G.723.1 codec is 40.91MCPS for encoder and 3.67MCPS for decoder. In case of static link library (SLL), required memories are 56.83Kbytes.