本文首先闡述了G.723.1語音編解碼標(biāo)準(zhǔn)的流程。根據(jù)低功耗、高性能的16位定點(diǎn)的數(shù)
字信號(hào)處理芯片TMS320DM642的特點(diǎn)對源代碼中運(yùn)算量較大的模塊進(jìn)行了代碼優(yōu)化。最
后，在DSP硬件平臺(tái)上對優(yōu)化后的編解碼器的復(fù)雜度和性能進(jìn)行了測試。從實(shí)驗(yàn)結(jié)果看，經(jīng)改進(jìn)優(yōu)化后的程序在內(nèi)存占用和運(yùn)算復(fù)雜度方面都達(dá)到了預(yù)期目標(biāo)，語音信號(hào)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