Phase-locked loop for synchronization with a subcarrier contained in an intelligence signal
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United States of America Patent
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-
Jan 16, 2007
Issued Date -
N/A
app pub date -
Mar 11, 2002
filing date -
Mar 9, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A phase-locked loop locks relatively quickly to a pilot tone of the stereo-multiplex signal when a new transmitter is tuned in. The stereo-multiplex signal may be multiplied in a multiplier by the quadrature component of the pilot tone generated by a digital oscillator. The result is a control signal that is provided to a low-pass filter, and the low-pass filtered control signal is provided as a control signal to an oscillator which may include a table of length N and a counter for addressing the table entries. The zero phase angle .phi..sub.0 may be set by a counter offset n.sub.0 by incrementing or decrementing the counter. A table may be utilized having a virtual length N+ which is larger than the length N of the real table. To access the real table, however, the corresponding MSBs of the actual count n(k) are used which match the address space of the real table of length N.
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