Frequency offset correcting circuit

Details Frequency offset correcting circuit Frequency offset correcting circuit

1984-08-24

1986-08-05

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329126, 375 81, 375120, H03D 300

Patent

active

046045830

ABSTRACT:
A second-order phase-locked loop (PLL) is provided following a demodulating section which is arranged to detect the baseband signals of incoming parallel channel signals. The second-order PLL, which is supplied with a baseband signal of a pilot channel from the demodulating section, includes a first and second control loops. The first control loop is adapted to correct a static phase shift of the pilot channel signal, while the second control loop functions to correct an abrupt frequency offset of same. The second-order PLL is further utilized to correct both static phase shifts and abrupt frequency offsets of data channels (viz., channels other than the pilot channel). A third control loop is further provided which extends between the second-order PLL and the input of the demodulating section, and which has a function by which static or slowly changing frequency offsets of the channels are compensated.

REFERENCES:
patent: 3818347 (1974-06-01), Holsinger

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