帶內(nèi)同頻道數(shù)字音頻廣播關(guān)鍵技術(shù)進(jìn)展
Progress on key techniques of in-band on-channel digital audio broadcast
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摘要: 基于編碼正交頻分復(fù)用的數(shù)字音頻廣播(DAB)具有魯棒性高和激光唱盤(CD)音質(zhì)等優(yōu)良性能。帶內(nèi)同頻道(IBOC)制式的DAB能夠在已有的模擬廣播頻道內(nèi)同播模擬和數(shù)字兩種信號(hào)，完全兼容現(xiàn)有的模擬接收機(jī)，以較低成本實(shí)現(xiàn)向全數(shù)字化DAB的平滑過渡。作者論述了FM IBOC DAB的頻譜分析，綜述了混合模式FM IBOC DAB的發(fā)射(接收)機(jī)的基本結(jié)構(gòu)和感知音頻編碼、前向糾錯(cuò)編碼、OFDM、第一鄰頻道干擾消除、時(shí)間延遲分集和音頻混合等關(guān)鍵技術(shù)，提出了發(fā)展我國(guó)的 IBOC DAB的一些建議。
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關(guān)鍵詞:
- 數(shù)字音頻廣播; 帶內(nèi)同頻道; 同播
Abstract: A Digital Audio Broadcasting(DAB) system, which is based on advanced technique of Coded Orthogonal Frequency Division Multiplexing (COFDM), can provide improved per-formance of high robustness and virtual CD-like quality. In-Band On-Channel(IBOC) digital audio systems have the capability of simultaneously transmitting both analog and digital signals (in hybrid mode)within the allocated channel mask, allowing full compatibility with existing analog receivers, and will accomplish smooth transition from analog broadcasting to all-digital mode DAB at low cost. The authors analyze the spectrum of Frequency Modulation (FM) IBOC DAB, and presents basic structures of FM IBOC DAB transmitting system and receiver, introducing key technologies of Perceptual Audio Codcr(PAC), Forward Error Coding(FEC), OFDM, First-Adjacent Canceling(FAC), Time Diversity Delay (TDD)and Audio Blend(AB). By careful comparison and analysis, some advice on development of Chinese IBOC DAB is given. -
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