.~ Frequency domain filters utilizing only lumped parameters {10}
169
.~.~ Wheatstone or lattice type
DEFINITION
Classification: 333/169
Wheatstone or lattice type:
(under subclass 167) Subject matter having four impedance branches connected in series to form a closed circuit, two nonadjacent junction points serving as input terminals while the remaining two junction points serve as output terminals.
(1) Note. Two of the impedance branches may be formed by a transformer winding having a mid-tap, the mid-tap forming one of the input or output terminals, and the other winding of the transformer forming the output or input connecting means. See Fig. 4 below.
(2) Note. Included are for example:
[figure] [figure] [figure] [figure]
SEE OR SEARCH THIS CLASS, SUBCLASS:
117+, for hybrid-type networks used in branched circuits.
133+, for similar networks which include electromechanical transducer elements.
SEE OR SEARCH CLASS 236, Automatic Temperature and Humidity Regulation,
69+, 74, 78, and 91 for temperature regulating systems which include impedance bridge networks as the control means.
318, Electricity: Motive Power Systems,
294, for motor reversing systems wherein the armature current reversal means includes an impedance bridge network; and subclass 535 for motor field circuit control systems which include an impedance bridge network; and subclasses 663+ for position servomechanisms which may include a bridge in the error detector circuit.
322, Electricity: Single Generator Systems,
77, for single generator systems where the generator field
circuit is controlled by means of an impedance bridge network.
323, Electricity: Power Supply or Regulation Systems,
365, for voltage magnitude control systems involving Wheatstone bridge arrangements.
324, Electricity: Measuring and Testing, appropriate subclasses, especially
98+, and 101+ for electric measuring and testing systems using impedance bridge arrangements.
330, Amplifiers, 146, for amplifier systems having an amplifier in one arm of a bridge; and subclass 175 for amplifier systems having a lattice or Wheatstone bridge network in the signal coupling means.
331, Oscillators,
110, and 138+ for bridge type oscillation generation systems in general.
332, Modulators,
172, for amplitude modulating systems of the bridge type having conjugate input and output.
