Phase-locked loop for synchronization with a subcarrier...

Details Phase-locked loop for synchronization with a subcarrier... Phase-locked loop for synchronization with a subcarrier...

2007-01-16

2007-01-16

Burd, Kevin (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S376000, C327S147000

Reexamination Certificate

active

10096341

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 φ0may be set by a counter offset n0by 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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