Method and apparatus for PCR jitter measurement in an MPEG-2 tra

Details Method and apparatus for PCR jitter measurement in an MPEG-2 tra Method and apparatus for PCR jitter measurement in an MPEG-2 tra

1997-06-18

1999-03-16

Tse, Young T.

Pulse or digital communications

Testing

Phase error or phase jitter

375371, 370468, 370516, 348464, 348500, H03B 346

Patent

active

058839240

ABSTRACT:
A method and a test instrument are provided for measuring program clock reference (PCR) jitter in a data stream, such as an MPEG-2 transport stream. The test instrument includes a line interface circuit for receiving the data stream, a digital computer for processing the data stream and a local clock for generating timestamps. The digital computer extracts from the data stream a PCR sample value which represents a count of a system time clock used to generate the data stream. The timestamp is obtained from the local clock and is associated with the PCR sample value. The digital computer determines a reconstructed system time clock from a set of values including the PCR sample value and the timestamp, and previously-received PCR sample values and associated timestamps within a window representative of a predetermined time interval. The window is shifted as new PCR sample values are received. The digital computer determines a PCR jitter value for the PCR sample value by determining a deviation of the PCR sample value from the reconstructed system time clock. The PCR jitter value may be displayed on a display unit, preferably in a histogram.

REFERENCES:
patent: 5533021 (1996-07-01), Branstad et al.
patent: 5537408 (1996-07-01), Branstad et al.
patent: 5640388 (1997-06-01), Woodhead et al.

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