公开(公告)号：US06169843A

公开(公告)日：2001-01-02

申请号：US08933582

申请日：1997-09-19

申请人： Michael P. Lenihan ,  Sean C. Hart ,  Mark Magee ,  Brian Johnson

发明人： Michael P. Lenihan ,  Sean C. Hart ,  Mark Magee ,  Brian Johnson

IPC分类号： H04N576

CPC分类号： H04N21/435 ,  H04N9/8042 ,  H04N9/8063 ,  H04N21/235 ,  H04N21/2368 ,  H04N21/4113 ,  H04N21/4135 ,  H04N21/4305 ,  H04N21/4334 ,  H04N21/434 ,  H04N21/4341 ,  H04N21/4344 ,  H04N21/8455

摘要： A method and apparatus for recording and playback of transport stream packets including multiplexed audio, video and other data streams. The transport streams may be generated in accordance with an MPEG-2 standard. In a record mode, an arrival timestamp is generated for each input transport packet to be recorded in a peripheral storage device. A given arrival timestamp indicates the arrival time of the corresponding transport packet in the recording system. Each of the transport packets are then stored with their corresponding arrival timestamps. The record mode may utilize a packet identifier (PID) decoder to perform packet filtering such that only incoming transport packets with selected PIDs are stored. In a playback mode, transport packets and corresponding arrival timestamps are retrieved from the storage device and the arrival timestamps are utilized to direct synchronous delivery of the transport packets to, for example, a decoder or a transport stream broadcast system. The playback mode may detect a timestamp discontinuity code in one or more of the arrival timestamps, and adjust the playback system time clock accordingly. The playback mode may also provide null packet interleaving in which a selectable number of null packets are inserted between each valid transport packet to thereby provide a selectable fixed-rate transport packet output. The recording and playback features may be implemented using a spooler card and a storage controller card incorporated into an otherwise conventional personal computer.

摘要翻译： 一种用于记录和重放包括复用的音频，视频和其他数据流的传输流分组的方法和装置。 可以根据MPEG-2标准生成传输流。 在记录模式中，对要记录在外围存储装置中的每个输入传送包生成到达时间戳。 给定的到达时间戳表示相应的传输分组在记录系统中的到达时间。 然后将每个传输分组与其对应的到达时间戳一起存储。 记录模式可以利用分组标识符（PID）解码器来执行分组过滤，使得仅存储具有所选PID的传入传输分组。 在重放模式中，从存储设备检索传输分组和对应的到达时间戳，并且使用到达时间戳来将传输分组的同步传送引导到例如解码器或传输流广播系统。 回放模式可以检测一个或多个到达时间戳中的时间戳不连续码，并相应地调整播放系统时钟。 回放模式还可以提供零分组交织，其中在每个有效传输分组之间插入可选数量的空分组，从而提供可选择的固定速率传输分组输出。 记录和回放特征可以使用假脱机程序卡和结合到另外常规的个人计算机中的存储控制器卡来实现。

公开(公告)号：US5793427A

公开(公告)日：1998-08-11

申请号：US731218

申请日：1996-10-11

申请人： Christopher Mills ,  Thomas R. Ayers ,  Michael P. Lenihan

发明人： Christopher Mills ,  Thomas R. Ayers ,  Michael P. Lenihan

IPC分类号： G06T9/00 ,  H04N7/26 ,  H04N11/04 ,  H04N21/40 ,  H04N11/02

CPC分类号： H04N11/042 ,  H04N19/10 ,  H04N19/90 ,  H04N21/40

摘要： A method and apparatus for differential video data encoding which utilizes a reduced number of bits per pixel to encode chroma and luma components of a video data stream. A 4-bit absolute code is determined for a given 8-bit luma or chroma component in the data stream. The determined absolute code is indicative of a particular one of a plurality of ranges into which the given component falls. The given component is encoded using the determined absolute code if the absolute code produces a lower encoding error than a 4-bit delta code which encodes the component as a difference relative to a previously-encoded component. If the delta code produces a lower encoding error than the determined absolute code, the given component is encoded using the delta code. In a situation in which the given component is the first component of its type on a line of video, an absolute code may be used regardless of whether or not the absolute code produces a higher encoding error than the delta code.

摘要翻译： 一种用于差分视频数据编码的方法和装置，其利用每像素减少的位数来编码视频数据流的色度和亮度分量。 为数据流中给定的8位亮度或色度分量确定4位绝对密码。 所确定的绝对代码指示给定组件落入的多个范围中的特定一个。 如果绝对代码产生比编码组件相对于先前编码的组件差的4位增量代码，则绝对代码产生较低的编码错误，则使用所确定的绝对代码对给定分量进行编码。 如果增量代码产生比确定的绝对代码更低的编码错误，则使用增量代码对给定的组件进行编码。 在给定组件是其类型在视频行上的第一个组件的情况下，可以使用绝对代码，而不管绝对代码是否产生比增量代码更高的编码错误。