US PATENT SUBCLASS 455 / 43
.~.~ With modification of frequencies of analog signal passed (e.g., pre-emphasis and de-emphasis)


Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

39  DF  TRANSMITTER AND RECEIVER AT SEPARATE STATIONS {14}
42  DF  .~ Frequency or phase modulation {3}
43.~.~ With modification of frequencies of analog signal passed (e.g., pre-emphasis and de-emphasis)


DEFINITION

Classification: 455/43

With modification of frequencies of analog signal passed (e.g., pre-emphasis or de-emphasis):

(under subclass 42) Subject matter where the information or modulating signal is predistorted and/or preamplified prior to its modulation of the carrier wave.

SEE OR SEARCH CLASS

332, Modulators,

123+, for frequency modulators, per se, with distortion introduction or control, e.g., pre-emphasis networks.

333, Wave Transmission Lines and Networks,

28+, for passive equalizing networks, per se.