声学技术
聲學技術
성학기술
Technical Acousitics
2013年
5期
400-405
,共6页
崔化超%赵安邦%周彬%孙坤平%崔岩%李桂娟
崔化超%趙安邦%週彬%孫坤平%崔巖%李桂娟
최화초%조안방%주빈%손곤평%최암%리계연
混合激励线性预测%正交频分复用%水声语音通信
混閤激勵線性預測%正交頻分複用%水聲語音通信
혼합격려선성예측%정교빈분복용%수성어음통신
Mixed-Excitation Linear Prediction(MELP)%Orthogonal Frequency Division Modulation(OFDM)%un-derwater acoustic speech communication
蛙人语音通信是水声领域研究的热点问题。利用多帧联合处理以及矢量量化技术实现了1.2kbps 速率的混合激励线性预测语音压缩编码,为适应水声信道的特点,采用正交频分复用技术对信源进行调制,并加入了同步、信道估计、RS纠错码等相关技术,以TMS320DM642和TLV320AIC23B等芯片为核心搭建硬件平台,设计并实现了一套水下实时双工语音通信系统。水池试验表明,在20 m距离上,合成语音清晰连贯并可分辨出说话人为谁,系统性能稳定。
蛙人語音通信是水聲領域研究的熱點問題。利用多幀聯閤處理以及矢量量化技術實現瞭1.2kbps 速率的混閤激勵線性預測語音壓縮編碼,為適應水聲信道的特點,採用正交頻分複用技術對信源進行調製,併加入瞭同步、信道估計、RS糾錯碼等相關技術,以TMS320DM642和TLV320AIC23B等芯片為覈心搭建硬件平檯,設計併實現瞭一套水下實時雙工語音通信繫統。水池試驗錶明,在20 m距離上,閤成語音清晰連貫併可分辨齣說話人為誰,繫統性能穩定。
와인어음통신시수성영역연구적열점문제。이용다정연합처리이급시량양화기술실현료1.2kbps 속솔적혼합격려선성예측어음압축편마,위괄응수성신도적특점,채용정교빈분복용기술대신원진행조제,병가입료동보、신도고계、RS규착마등상관기술,이TMS320DM642화TLV320AIC23B등심편위핵심탑건경건평태,설계병실현료일투수하실시쌍공어음통신계통。수지시험표명,재20 m거리상,합성어음청석련관병가분변출설화인위수,계통성능은정。
Underwater frogman speech communication is always a hot issue in underwater acoustic field. In this paper a 1.2kbps bit rate Mixed Excitation Linear Prediction (MELP) speech compression algorithm is implemented through multi-frame joint and Vector Quantization (VQ) technology. In order to adapt to underwater acoustic channel, the Or-thogonal Frequency Division Modulation (OFDM) is used to modulate the source bits, together with synchronization, channel estimation and Reed-Solomon (RS) error correcting code techniques. The hardware platform of this speech communication system relies on the chips DM642 and AIC23 and some auxiliary circuits for SDRAM and FLASH. The system actualizes duplex speech signal acquisition and transmission and tank-testing results prove that the synthesized speech is clear and understandable at the distance of about 20 meters and the system has a stable performance.