本文首先闡述了G.723.1語音編解碼標準的流程。根據(jù)低功耗、高性能的16位定點的數(shù)
字信號處理芯片TMS320DM642的特點對源代碼中運算量較大的模塊進行了代碼優(yōu)化。最
后，在DSP硬件平臺上對優(yōu)化后的編解碼器的復雜度和性能進行了測試。從實驗結(jié)果看，經(jīng)改進優(yōu)化后的程序在內(nèi)存占用和運算復雜度方面都達到了預期目標，語音信號經(jīng)編碼器編碼解碼之后失真很小。
關(guān)鍵詞: G.723.1；語音編碼；DSP
Abstract: This article first specifies the process of G.723.1 standard. Then, it optimizes the larger operational quantity modules of the source code, according to the characteristics of low power loss and high-performance 16-bit fixed-point digital signal processing chip TMS320DM642. Finally, the performance is tested and evaluated and the optimized programs have met with the expectation in data storage and operational complexity. The distortion of the decoded speech is rather small.
Key Words: G.723.1; speech coding; DSP