(under subclass 24) Networks including four terminals, the impedance across one pair of terminals being symmetrical and the impedance across another pair of these terminals being unsymmetrical with respect to a given potential plane (e.g., ground), these impedances being effective to convert symmetrical potential applied at the symmetrical pair of terminals to unsymmetrical potential at the other pair of terminals or to convert unsymmetrical potential applied at the unsymmetrical pair of terminals to symmetrical potential at the other pair of terminals, and systems under the class definition including a balanced to unbalanced circuit coupling.
SEE OR SEARCH THIS CLASS, SUBCLASS:
1+, for plural channel systems, which involve coupling a balanced circuit to an unbalanced circuit or vice versa.
12, for systems for reducing inductive or radiation interference and which include coupling between balanced and unbalanced circuits.
SEE OR SEARCH CLASS
323, Electricity: Power Supply or Regulation Systems,
212, 219 for phase control systems with means to introduce delay into a part of the system, and including such systems using reactive impedances and transformer systems to obtain a phase shift (e.g., a 1805 shift) and which are designed for use at a single frequency. 329, Demodulators, appropriate subclasses for demodulators having inputs or outputs which are balanced or unbalanced.
330, Amplifiers,
275, and 301 for transistor amplifiers with balanced-to-unbalanced coupling and vice versa, subclass 116 for amplifier systems having balanced-to-balanced coupling, and subclass 117 for amplifier systems having unbalanced-to-balanced coupling.
343, Communications: Radio Wave,
821, for balanced doublet type antennas with a balanced to unbalanced coupling network; and subclass 859 for antennas in general with a balanced to unbalanced coupling network.
363, Electric Power Conversion Systems,
2+, 9+, 36, and 148+ for systems converting energy from one number of phases to a different number of phases.
