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    • 5. 发明授权
    • Real-time processing of a synchronous or isochronous data stream in the presence of gaps in the data stream due to queue underflow or overflow
    • 在存在由于队列下溢或溢出引起的数据流中的间隙的同步或等时数据流的实时处理
    • US06631429B2
    • 2003-10-07
    • US09471942
    • 1999-12-23
    • Erik C. Cota-RoblesBarry O'MahonyAlberto J. Martinez
    • Erik C. Cota-RoblesBarry O'MahonyAlberto J. Martinez
    • G06F1300
    • H04L12/64H04L25/05
    • In one embodiment of the present invention, an output device sends a spurious data sample in place of a first data sample to be sent from a queue if the queue is in a state of underflow during which the first data sample is not available to be sent. The buffer is to store data samples for an isochronous data transmission. Circuitry skips the first data sample when the first data sample becomes available in the queue so that synchronization for subsequent data samples sent from the queue is preserved. In another embodiment of the present invention, an input device advances an input buffer pointer to point to a next location in a memory in response to receiving a data sample at a queue during a state of overflow. The input buffer pointer indicates a location in the memory to which a next data sample is to be sent from the queue. The queue stores data samples for an isochronous data transmission. By advancing the input buffer pointer, synchronization for subsequent data samples is preserved.
    • 在本发明的一个实施例中,如果队列处于下溢状态,则第一数据样本不可用于发送,则输出设备发送伪数据样本代替要从队列发送的第一数据样本 。 缓冲区用于存储用于同步数据传输的数据样本。 当第一个数据样本在队列中可用时,电路会跳过第一个数据样本,以便保留从队列发送的后续数据样本的同步。 在本发明的另一实施例中,响应于在溢出状态期间在队列处接收到数据样本,输入装置使输入缓冲器指针前进到指向存储器中的下一个位置。 输入缓冲区指针指示要从队列发送下一个数据样本的存储器中的位置。 队列存储用于等时数据传输的数据样本。 通过前进输入缓冲区指针,保留后续数据样本的同步。
    • 8. 发明授权
    • Mechanism and method for multiplexing voice and data over a signal
carrier with high bandwidth efficiency
    • 通过具有高带宽效率的信号载波复用语音和数据的机制和方法
    • US5878120A
    • 1999-03-02
    • US805898
    • 1997-02-24
    • Barry O'Mahony
    • Barry O'Mahony
    • H04M11/06H04M11/00
    • H04M11/064
    • A micro-controller having multiple operating modes, including an idle mode, an analog voice mode, a digital data mode, and a simultaneous voice and data (SVD) mode, is provided to a DCE designed to support multi-modal voice and/or data calls over a single analog-loop telephone line. The micro-controller further contains control logic for establishing multiple logical connections and voice as well as data transmission protocols over these logical connections with another DCE, when switching from the analog voice mode to the SVD mode, and for multiplexing voice and data transmissions over these logical connections. The control logic transmits voice over a logical voice connection in nominally fixed intervals. A non-voice transmission, i.e. data or information to be exchanged, can be suspended in favor of transmitting a voice transmission. During the suspension, a special character (e.g., escape) is transmitted in conjunction with a length preceding the voice transmission. After the voice transmission is complete, the data transmission is continued. By suspending (rather than ending and then restarting) the non-voice transmission, a large amount of "framing bits" are effectively eliminated and the bandwidth efficiency of the multiplexed transmission is increased. Effectively, voice information can be transmitted embedded within a data (e.g., non real time) transmission.
    • 具有多种操作模式的微控制器被提供给设计成支持多模态语音和/或视频的DCE的DCE,包括空闲模式,模拟语音模式,数字数据模式和同时语音和数据(SVD)模式 通过单个模拟回路电话线进行数据通话。 微控制器还包含控制逻辑,用于在从模拟语音模式切换到SVD模式时,通过与另一个DCE的逻辑连接建立多个逻辑连接和语音以及数据传输协议,以及通过这些逻辑复用语音和数据传输 逻辑连接。 控制逻辑通过逻辑语音连接以标称固定的间隔传输语音。 可以暂停非语音传输,即要交换的数据或信息,有利于发送语音传输。 在暂停期间,与语音传输之前的长度一起发送特殊字符(例如,转义)。 语音传输完成后,继续进行数据传输。 通过暂停(而不是结束然后重新启动)非语音传输,有效地消除了大量的“成帧比特”,并且增加了复用传输的带宽效率。 有效地,语音信息可以被嵌入在数据(例如,非实时)传输中。
    • 9. 发明授权
    • Method and apparatus for multiplexing voice and data on a single
analog-loop telephone line
    • 用于在单个模拟环路电话线上复用语音和数据的方法和装置
    • US5692035A
    • 1997-11-25
    • US622444
    • 1996-03-22
    • Barry O'MahonyNarjala Bhasker
    • Barry O'MahonyNarjala Bhasker
    • H04M11/06H04M11/00
    • H04M11/064
    • An enhanced micro-controller having multiple operating modes, including an idle mode, an analog voice mode, a digital data mode, and a simultaneous voice and data (SVD) mode, is provided to a DCE designed to support multi-modal voice and/or data calls over a single analog-loop telephone line. The enhanced micro-controller further contains control logic for establishing multiple logical connections and voice as well as data transmission protocols over these logical connections with another DCE, when switching from the analog voice mode to the SVD mode, and for multiplexing voice and data transmissions over these logical connections. During operation, the control logic transmits voice over a logical voice connection in nominally fixed intervals without error control, i.e. re-transmission for reliability. If non-voice transmission, i.e. data or information to be exchanged, is in progress, when it is time to transmit voice, and there are voice to be transmitted, the non-voice transmission is preferably suspended in favor of the voice transmission.
    • 具有多种操作模式的增强型微控制器被提供给DCE,该DCE设计包括空闲模式,模拟语音模式,数字数据模式和同时的语音和数据(SVD)模式,其被设计成支持多模式语音和/ 或通过单个模拟回路电话线进行数据通话。 增强型微控制器还包含用于在从模拟语音模式切换到SVD模式时通过这些逻辑连接与另一个DCE建立多个逻辑连接和语音以及数据传输协议的控制逻辑,以及用于复用语音和数据传输 这些逻辑连接。 在操作期间,控制逻辑通过逻辑语音连接以标称固定的间隔发送语音,而无误差控制,即为可靠性重传。 如果非语音传输,即要交换的数据或信息正在进行中,那么当是发送语音的时间,并且存在要发送的语音时,优选地暂停非语音传输来有利于语音传输。