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Method and apparatus for measuring delay within a compressed digital stream

A data stream, digital audio technology, applied in the field of digital audio and video data stream testing

Inactive Publication Date: 2016-02-03
TEKTRONIX INT SALES GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] What these existing techniques all have in common is that they attempt to measure the absolute delay between the audio and video streams when compared to an ideally timed synchronization

Method used

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  • Method and apparatus for measuring delay within a compressed digital stream
  • Method and apparatus for measuring delay within a compressed digital stream
  • Method and apparatus for measuring delay within a compressed digital stream

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Embodiment Construction

[0045] Embodiments of the present invention will now be described with reference to the drawings, in which the same or similar components or steps are given the same or similar reference numerals.

[0046] The following description is given in terms of measuring the time delay between a first (eg video) packetized elementary stream and an associated second (eg audio) packetized elementary stream. However, it will be apparent that the same method and apparatus may be used to measure the delay between any associated packetized elementary streams within a Transport Stream or Program Stream.

[0047] figure 1 A high-level schematic diagram of a typical digital audio video transmission system is shown, wherein an input audio / video / data feed 110 is input into an audio / video encoding system 200, which produces a transport stream (or (one or more (a) program stream) to be sent out through the distribution system 120 to an end viewer using an integrated digital television 140, a telev...

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PUM

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Abstract

There is provided a method of measuring delay variation between first and second elementary streams in a digital audiovisual data stream, comprising detecting and storing digital audiovisual data stream timestamp values, detecting and storing elementary stream timestamp values for the first and second elementary streams, interpolating the digital audiovisual data stream timestamp values and elementary stream timestamp values to form data sets having mutual sampling points, and subtracting the interpolated data set for the first elementary data stream from the interpolated data set for the second elementary data stream to form elementary stream difference values indicative of changes in delay over time between first and second elementary streams.

Description

technical field [0001] The present invention relates generally to digital audiovisual data stream testing, and in particular to an improved method and apparatus for measuring delay in compressed digital audiovisual data streams. Background technique [0002] Most modern digital television broadcast systems, including so-called "on-demand" television services, Internet Protocol Television (IPTV), etc., use digital compression and transmission techniques to deliver audiovisual content to end viewers. [0003] In these digital audio video systems, audio and video data are compressed by an encoder (using a common compression standard such as MPEG-2, MPEG-4, H.264, etc.) to produce a separate compressed elementary stream for each data type, so The compressed elementary stream is then packaged into a Packetized Elementary Stream (PES: Packetized Elementary Stream). Other data such as subtitle data can also be packed into PES packets. Multiple PES packets are in turn combined int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/242H04N21/8547H04N21/234
CPCH04N17/004H04N21/234318H04N21/242H04N21/4302H04N21/44209H04N21/43072
Inventor M·诺尔曼P·罗宾逊
Owner TEKTRONIX INT SALES GMBH