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Robust method for recovering a program time base in MPEG-2 transport streams and achieving audio/video synchronization

A program clock reference, audio technology, applied in the direction of pulse modulation TV signal transmission, TV, electrical components, etc., can solve the problem that audio and video decoders cannot guarantee the time interval to receive content data.

Inactive Publication Date: 2005-01-05
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

So, even in the absence of discontinuities, audio and video decoders are not guaranteed to receive content data at regular intervals after the data arrives at the decoder input

Method used

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  • Robust method for recovering a program time base in MPEG-2 transport streams and achieving audio/video synchronization
  • Robust method for recovering a program time base in MPEG-2 transport streams and achieving audio/video synchronization
  • Robust method for recovering a program time base in MPEG-2 transport streams and achieving audio/video synchronization

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Embodiment Construction

[0016] discussed below Figure 1 to Figure 3A - 3B and the various embodiments used to describe the principles of the invention in this patent document are by way of illustration only and are not intended to limit the scope of the invention in any way. Those skilled in the art will understand that the principles of the invention may be implemented in any suitably arranged device.

[0017] figure 1 A video system using a robust MPEG-2 decoder according to one embodiment of the invention is described. In this illustrative embodiment, a video system 100 is implemented in a video receiver 101 having an input 102 for receiving an MPEG-2 broadcast stream including a program clock reference signal according to known techniques and multiplexed audio and video packets with decode and display timestamps in each.

[0018] Video receiver 101 may be a digital television (DTV) or high definition television (HDTV) receiver, a satellite, terrestrial or cable broadcast receiver unit for con...

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Abstract

An internal system time clock (201) within an MPEG-2 decoder is synchronized in frequency and optionally in phase, but not in value, to program clock reference time stamps within a received MPEG-2 transport stream. A demultiplexer (202) separating audio and video packets from the transport stream modifies the decoding and presentation time stamps within such packets by at least an offset between the program clock reference time stamp values and the internal system time clock time before forwarding the packets to the audio and video decoders. Discontinuities in the program clock reference time stamp sequence automatically result in a change in the offset, such that the internal system time clock continues to increase monotonically and decoding and presentation time stamps within the packets are not suddenly invalidated.

Description

technical field [0001] The present invention is directed generally to the simultaneous decoding of digital audio / video data packets from a broadcast stream, and more particularly to the processing of time-based sequences in reference signals used to arrange the decoding and display of the contents of such audio / video data packets. continuous. Background technique [0002] The Moving Pictures Experts Group Version 2 (MPEG-2) standard is a digital audio / video (A / V) compression standard used in many types of audio / video distribution systems, including, for example, Digital Satellite System (DSS) broadcasting . The MPEG-2 transmission standard, ISO13818-1, requires broadcast stations to send Program Clock Reference (PCR) timestamps at periodic intervals in multiple streams of audio and video packets. This program clock reference timestamp, called the System Clock Reference (SCR) in the DSS program stream, is strictly related to the System Clock (STC) in the MPEG-2 encoder that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/70H04N21/43H04N21/434
CPCH04N21/4344H04N21/4302H04N21/4305H04N21/43H04N21/8547
Inventor A·S·范德沙亚尔M·马尼A·格里姆R·米纳克斯森达拉姆
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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