US PATENT SUBCLASS 369 / 44.41
.~.~ Arithmetic operation using plural photodetectors

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369 /   HD   DYNAMIC INFORMATION STORAGE OR RETRIEVAL

43  DF  WITH SERVO POSITIONING OF TRANSDUCER ASSEMBLY OVER TRACK COMBINED WITH INFORMATION SIGNAL PROCESSING {1}
44.11  DF  .~ Optical servo system {12}
44.41.~.~ Arithmetic operation using plural photodetectors {1}
44.42  DF  .~.~.~> Beam or detector is not rectangular or circular

DEFINITION

Classification: 369/44.41

Arithmetic operation using plural photo-detectors:

Subject matter under 44.11 where more than one of addition, subtraction, multiplication, division is performed upon an output signals of plural photodetectors for the purpose of deriving one or more servo signals.