低速率語音編解碼專用芯片的設(shè)計(jì).doc
約6頁DOC格式手機(jī)打開展開
低速率語音編解碼專用芯片的設(shè)計(jì),全文約4400字論述翔實(shí) 文 摘 為了滿足可視電話系統(tǒng)對(duì)高質(zhì)量，低成本語音編解碼器的需要，采用數(shù)字信號(hào)處理器內(nèi)核(dsp core)的方法，設(shè)計(jì)了符合itu-t g.723.1建議的5.3kbit/s和6.3kbit/s雙速率語音編解碼器專用芯片。針對(duì)g.723.1算法特點(diǎn)，進(jìn)行算法優(yōu)化...
內(nèi)容介紹
此文檔由會(huì)員 花季永駐 發(fā)布
低速率語音編解碼專用芯片的設(shè)計(jì)
全文約4400字 論述翔實(shí)
文 摘 為了滿足可視電話系統(tǒng)對(duì)高質(zhì)量，低成本語音編解碼器的需要，采用數(shù)字信號(hào)處理器內(nèi)核(DSP Core)的方法，設(shè)計(jì)了符合ITU-T G.723.1建議的5.3kbit/s和6.3kbit/s雙速率語音編解碼器專用芯片。針對(duì)G.723.1算法特點(diǎn)，進(jìn)行算法優(yōu)化，如變卷積運(yùn)算為加/減運(yùn)算，避開求余運(yùn)算等，并對(duì)需要最大運(yùn)算量的情況作了模擬，保證語音編解碼器在最壞情況下也能正常工作。根據(jù)專用芯片的結(jié)構(gòu)，設(shè)計(jì)了編解碼器的流程和接口模塊，用較少的運(yùn)算量和較小的存儲(chǔ)空間，實(shí)時(shí)實(shí)現(xiàn)了G.723.1建議及其附錄A的全部功能和選項(xiàng)，并通過了全套測試序列的檢驗(yàn)，而且留出足夠多的資源實(shí)現(xiàn)自適應(yīng)回聲抵消、調(diào)制解調(diào)等其它功能。
關(guān)鍵詞 低速率語音編碼，專用芯片，可視電話
分類號(hào) TN 912.3
ASIC design for low bit rate speech coding
JIA Zhike，CUI Huijuan，TANG Kun，F(xiàn)ENG Chongxi
Department of Electronic Engineering,Tsinghua University，Beijing 100084，China
Abstract In order to get a high quality and low cost speech coder for videophone system，an ASIC (Application Specific Integrated Circuit) was designed using DSP core. The speech coder complies with ITU-T Recommendation G.723.1 (dual rate speech coder for multimedia communications transmitting at 5.3 & 6.3kbit/s). According to the features of the G.723.1 algorthm and the architecture of the ASIC，some optimizations were used to reduce the computation complex and the memory size. The worst case which would cost maximum computation amount was simulated to ensure the coder can work properly in this case. The chart of the coder and its performance were presented. There is still enough resource left in this ASIC to implement the MODEM and the echo cancellator.
Key words low bit rate speech coding； ASIC (Application Specific Integrated Circuit)； videophone
參考文獻(xiàn)
[1] 楊行峻，遲惠生，唐 昆，等. 語音信號(hào)數(shù)字處理. 北京：電子工業(yè)出版社，1995
[2] ITU-T. Draft Recommendation G.723.1 Dual rate speech coder for multimedia telecommunications transmitting at 5.3 & 6.3 kbit/s. Ocotober，1995
[3] ITU-T. Annex A to Recommendation G.723.1 Silence compression scheme for dual rate communications transmitting at 5.3 & 6.3 kbit/s. May，1996
[4] Analog Devices Inc. ADSP-2100 Family User's Manual. 1991
[5] Analog Devices Inc. ADSP-2181 Data Sheet. 1994
全文約4400字 論述翔實(shí)
文 摘 為了滿足可視電話系統(tǒng)對(duì)高質(zhì)量，低成本語音編解碼器的需要，采用數(shù)字信號(hào)處理器內(nèi)核(DSP Core)的方法，設(shè)計(jì)了符合ITU-T G.723.1建議的5.3kbit/s和6.3kbit/s雙速率語音編解碼器專用芯片。針對(duì)G.723.1算法特點(diǎn)，進(jìn)行算法優(yōu)化，如變卷積運(yùn)算為加/減運(yùn)算，避開求余運(yùn)算等，并對(duì)需要最大運(yùn)算量的情況作了模擬，保證語音編解碼器在最壞情況下也能正常工作。根據(jù)專用芯片的結(jié)構(gòu)，設(shè)計(jì)了編解碼器的流程和接口模塊，用較少的運(yùn)算量和較小的存儲(chǔ)空間，實(shí)時(shí)實(shí)現(xiàn)了G.723.1建議及其附錄A的全部功能和選項(xiàng)，并通過了全套測試序列的檢驗(yàn)，而且留出足夠多的資源實(shí)現(xiàn)自適應(yīng)回聲抵消、調(diào)制解調(diào)等其它功能。
關(guān)鍵詞 低速率語音編碼，專用芯片，可視電話
分類號(hào) TN 912.3
ASIC design for low bit rate speech coding
JIA Zhike，CUI Huijuan，TANG Kun，F(xiàn)ENG Chongxi
Department of Electronic Engineering,Tsinghua University，Beijing 100084，China
Abstract In order to get a high quality and low cost speech coder for videophone system，an ASIC (Application Specific Integrated Circuit) was designed using DSP core. The speech coder complies with ITU-T Recommendation G.723.1 (dual rate speech coder for multimedia communications transmitting at 5.3 & 6.3kbit/s). According to the features of the G.723.1 algorthm and the architecture of the ASIC，some optimizations were used to reduce the computation complex and the memory size. The worst case which would cost maximum computation amount was simulated to ensure the coder can work properly in this case. The chart of the coder and its performance were presented. There is still enough resource left in this ASIC to implement the MODEM and the echo cancellator.
Key words low bit rate speech coding； ASIC (Application Specific Integrated Circuit)； videophone
參考文獻(xiàn)
[1] 楊行峻，遲惠生，唐 昆，等. 語音信號(hào)數(shù)字處理. 北京：電子工業(yè)出版社，1995
[2] ITU-T. Draft Recommendation G.723.1 Dual rate speech coder for multimedia telecommunications transmitting at 5.3 & 6.3 kbit/s. Ocotober，1995
[3] ITU-T. Annex A to Recommendation G.723.1 Silence compression scheme for dual rate communications transmitting at 5.3 & 6.3 kbit/s. May，1996
[4] Analog Devices Inc. ADSP-2100 Family User's Manual. 1991
[5] Analog Devices Inc. ADSP-2181 Data Sheet. 1994
