Framed delta sigma data with unlikely delta sigma data patterns
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United States of America Patent
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Jun 18, 2002
Issued Date -
N/A
app pub date -
Mar 4, 1998
filing date -
Apr 22, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A communication system having a framing pattern to frame data to be transmitted to a phone line is provided. The data may be framed on one side of an isolation barrier and a clock signal may be extracted from the framed data stream on the other side of the barrier. The data to be framed is provided from an output of a delta-sigma modulator and the framing pattern utilized is a pattern that is unlikely to match the data stream output of the modulator. Thus, an erroneous detection of the framing pattern is unlikely to occur. The framing pattern is chosen to correspond to the expected modulator output for a full scale input signal that is at a frequency higher than the maximum actual frequency of the input data provided to the modulator.
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