公开(公告)号：EP0776134A3

公开(公告)日：1999-05-12

申请号：EP96118657.4

申请日：1996-11-21

申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

发明人： Nuber, Ray ,  Moroney, Paul ,  Walker, G. Kent

IPC分类号： H04N7/52

CPC分类号： H04N21/4392 ,  G10L19/005 ,  H04N19/895 ,  H04N21/4305 ,  H04N21/4307 ,  H04N21/4341 ,  H04N21/8106

摘要： Audio data is processed from a packetized data stream carrying digital television information in a succession of fixed length transport packets. Some of the packets contain a presentation time stamp (PTS) indicative of a time for commencing the output of associated audio data. After the audio data stream has been acquired, the detected audio packets are monitored to locate subsequent PTS's for adjusting the timing at which audio data is output, thereby providing proper lip synchronization with associated video. Errors in the audio data are processed in a manner which attempts to maintain synchronization of the audio data stream while masking the errors. In the event that the synchronization condition cannot be maintained, for example in the presence of errors over more than one audio frame, the audio data stream is reacquired while the audio output is concealed. An error condition is signaled to the audio decoder by altering the audio synchronization word associated with the audio frame in which the error has occurred.

公开(公告)号：EP0671828A1

公开(公告)日：1995-09-13

申请号：EP95100183.3

申请日：1995-01-09

申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

发明人： Walker, G. Kent ,  Moroney, Paul

IPC分类号： H04L7/00

CPC分类号： H04L7/0083 ,  H03L7/06 ,  H04J3/0632

摘要： The apparent accuracy of a clock circuit (20) used to recover timing and transmitted information signals in a data receiver is improved. A timing relationship inherent in a received signal (10) is detected (34, 40) prior to the acquisition of a timing component embedded (16) in a desired information portion of the received signal. The timing relationship has an accuracy that is greater than the accuracy of the clock circuit (20). The clock circuit (20) is controlled in response to the timing relationship to operate with an improved range of accuracy. Thereafter, the embedded timing component is acquired and used to control the clock circuit. In an illustrated embodiment, the timing relationship is derived from a symbol rate (40) of the received signal. In an alternate embodiment, the timing relationship is obtained from a separate transmitted reference signal (34), such as a transmitted television signal.

摘要翻译： 的时钟电路（20）的表观准确性用于恢复在数据接收器定时和反式mitted信息信号得到改善。 在接收到的信号（10）固有的定时关系被采集（16）在接收信号中的所希望的信息部分嵌入的定时分量（34，40）之前的检测。 的定时关系来精度确实比时钟电路（20）的准确度越大。 时钟电路（20）被控制响应于所述定时关系在改善的准确度的范围内与操作。 那里之后，嵌入式定时分量被获取并用来控制时钟电路。 在图示的实施例中，定时关系从所接收的信号的符号率（40）导出。 在一个替代实施例中，定时关系是从一个单独的反式mitted参考信号（34）得出：如反式mitted电视信号。

公开(公告)号：EP0776134A2

公开(公告)日：1997-05-28

申请号：EP96118657.4

申请日：1996-11-21

申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

发明人： Nuber, Ray ,  Moroney, Paul ,  Walker, G. Kent

IPC分类号： H04N7/52

CPC分类号： H04N21/4392 ,  G10L19/005 ,  H04N19/895 ,  H04N21/4305 ,  H04N21/4307 ,  H04N21/4341 ,  H04N21/8106

摘要： Audio data is processed from a packetized data stream carrying digital television information in a succession of fixed length transport packets. Some of the packets contain a presentation time stamp (PTS) indicative of a time for commencing the output of associated audio data. After the audio data stream has been acquired, the detected audio packets are monitored to locate subsequent PTS's for adjusting the timing at which audio data is output, thereby providing proper lip synchronization with associated video. Errors in the audio data are processed in a manner which attempts to maintain synchronization of the audio data stream while masking the errors. In the event that the synchronization condition cannot be maintained, for example in the presence of errors over more than one audio frame, the audio data stream is reacquired while the audio output is concealed. An error condition is signaled to the audio decoder by altering the audio synchronization word associated with the audio frame in which the error has occurred.

摘要翻译： 音频数据从一系列固定长度的传输分组携带数字电视信息的分组化数据流处理。 一些分组包含指示用于开始相关联的音频数据的输出的时间的演示时间戳（PTS）。 在获取音频数据流之后，监视检测到的音频分组以定位用于调整输出音频数据的定时的后续PTS，由此提供与相关视频的适当的唇同步。 以试图保持音频数据流的同步同时掩盖错误的方式处理音频数据中的错误。 在不能保持同步条件的情况下，例如在存在多于一个音频帧的错误的情况下，音频数据流被重新获取，同时音频输出被隐藏。 通过改变与发生错误的音频帧相关联的音频同步字，向音频解码器发出错误状况。