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    • 5. 发明申请
    • LOW COST DIGITAL REAL-TIME LINK SYSTEM
    • 低成本数字实时链接系统
    • WO2008128544A1
    • 2008-10-30
    • PCT/DK2008/000153
    • 2008-04-24
    • BANG & OLUFSEN A/SJENSEN, Henrik, LundMADSEN, John, HammerPEDERSEN, Finn Hedegaard
    • JENSEN, Henrik, LundMADSEN, John, HammerPEDERSEN, Finn Hedegaard
    • H04L12/44H04L12/413H04L12/40
    • H04L12/66
    • A low cost digital loudspeaker link system utilizes low cost Ethernet physical layer components to achieve real-time transportation of digital PCM audio data and matching control- and status information. It is intended as link between an audio control centre, TV-set products and a number of active powered loudspeakers in a home audio setup. The transport media is standard Ethernet style twisted-pair cables (100Base-TX lOOMbit). Every device in the link system, Audio master, TV-set or loudspeaker, has two Ethernet physical layer ICs (PHY's) enabling 2 full duplex communication channels on the media using 2 standard Ethernet Mil interfaces. The protocol layer above the Mil interface layer is handled by an FPGA device. The protocol according to the invention is designed in a manner that makes it possible to embed synchronization information in-between data. The synchronisation information makes it possible to regenerate an audio sample clock in the receiving end. The system is based on having one "link master" which is also the primary "audio clock master". But the system is not limited to having only one audio clock master, but can easily be expanded to more audio clock masters in the same link system.
    • 低成本的数字扬声器链路系统利用低成本的以太网物理层组件来实现数字PCM音频数据的实时传输以及匹配的控制和状态信息。 它旨在作为音频控制中心,电视机产品和家庭音频设置中的多个有源电源扬声器之间的链接。 传输媒体是标准的以太网双绞线电缆(100Base-TX lOOMbit)。 链路系统,音频主机,电视机或扬声器中的每个设备都有两个以太网物理层IC(PHY),使用2个标准以太网Mil接口在媒体上实现2个全双工通信通道。 Mil接口层上方的协议层由FPGA器件处理。 根据本发明的协议被设计成使得可以在数据之间嵌入同步信息的方式。 同步信息使得可以在接收端重新生成音频采样时钟。 该系统基于具有一个“链路主机”,其也是主要的“音频时钟主机”。 但是系统并不限于只有一个音频时钟主机,而是可以在同一个链路系统中轻松扩展到更多的音频时钟主机。