Current as of: June, 1999
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Classification: 333/20

(under the class definition) Passive networks for modifying an electrical wave passing therethrough so that the amplitude time characteristic of the output wave is different from that

of the input wave and which have no function classified in other classes, and long line wave transmission systems in combination with a passive wave shaping network.

(1) Note. The networks are usually designed to modify or shape a single pulse and usually involve a delay network or equivalent delay means.

(2) Note. Included are long transmission lines in combination with a wave shaping network which is designed to restore the wave shape to a wave which has been distorted by transmission over the transmission line.

(3) Note. Excluded are mere limiter networks which shape the wave merely by cutting off the wave above a predetermined amplitude.

(4) Note. Many systems and networks inherently function to wave shape. Most of these systems are excluded as they include active elements, such as oscillation generators, amplifiers, detectors, etc. Where the network is primarily designed for a purpose other than wave shaping, such as controlling the magnitude of current in the circuit, the network is excluded even though the control of the current magnitude is effected by a means which also effects the wave shape of the element.

SEE OR SEARCH THIS CLASS, SUBCLASS: 1+, for systems combining wave energy from different channels and/or separating wave energy into different channels.

14, for amplitude range compression and expansion systems.

19, for wave shaping networks producing a time derivative or time integral of the applied wave energy (i.e. differentiating or integrating networks).

28, for networks modifying the attenuation or attenuation and phase characteristic with respect to frequency of the energy passing therethrough (i.e. equalizers).

81, for attenuator networks.


84, Music,

622+, 626+, 659+, 671 - 677 and 692 - 711 for systems for the electrical production of complex waves in musical instruments.

178, Telegraphy,

2+, and particularly subclasses 63, 69 and 69.1 for telegraph systems involving combining and/or separating and/or shaping of electric waves.

307, Electrical Transmission or Interconnection Systems, 106+, for waveform or wave shape determinative or pulse producing systems which are class appropriate. The networks and systems in Class 307 may involve long line elements, but ordinarily include also a specific source of wave energy or pulse producing means, such as a DC source and switching means.

324, Electricity: Measuring and Testing,

76.12+, for electrical systems for the analysis of complex waves, and subclasses 76.39+ for electrical frequency measuring systems which involve wave analysis.

327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,

100+, for miscellaneous converting, shaping, or generating circuits such as miscellaneous limiters and clock or pulse production circuits.

330, Amplifiers,

53+, for amplifier systems combined with a long line element, where the amplifiers may correct for the distortions caused by the long line.

331, Oscillators,

75+, for oscillator systems combined with an output circuit including a space discharge or unilaterally conductive device, which device may provide a wave distorting or shaping function.

332, Modulators appropriate subclasses for modulator systems which involve wave shaping.

340, Communications: Electrical,

825.77+, for selective electrical communication systems wherein the selective means is responsive to the amplitude of the signal. 363, Electric Power Conversion Systems, appropriate subclasses for conversion systems which involve wave shaping, see

34+, for systems for converting A.C. to D.C. and then connecting the D.C. to A.C., subclasses 39+ for conversion systems with means to introduce or eliminate frequency components, and subclasses 157+ for frequency conversion systems. The systems in Class 363 usually involve the use of alternating current which is repetitive and do not involve the shaping of a single pulse.

379, Telephonic Communications, appropriate subclasses for telephone systems involving combining and/or separating and/or shaping of electric waves.