US PATENT SUBCLASS 330 / 147
PLURAL SIGNAL INPUTS
Current as of: June, 1999
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DEFINITION
Classification: 330/147
(under the class definition) Subject matter wherein at least two separate and independent sources of signal energy are
coupled to the input of the amplifying device.
(1) Note. Where each of the separate sources has an amplifying device in its input circuit before being jointly coupled to an amplifying device, classification is not herein.
(2) Note. The two separate sources need not operate to feed signal energy to the amplifying device simultaneously but may operate selectively, for example, as by switching the sources whereby one is feeding the amplifying device at a time.
(3) Note. A balanced circuit is treated as a single source in this class. See the definition and notes under subclass 116 above.
SEE OR SEARCH THIS CLASS, SUBCLASS:
53+, for amplifiers having distributed parameter type coupling means. 69, for sum and difference amplifiers.
74, for series energized vacuum tube amplifiers having plural separate inputs to series devices.
84, for signal amplifiers having plural amplifier channels.
124+, see (1) Note above, also for plural separate inputs to plural channels.
185+, for amplifiers having significant input networks.
252+, for semiconductor amplifiers having plural inputs or plural channels.
SEE OR SEARCH CLASS
307, Electrical Transmission or Interconnection Systems,
18+, and 43+ for electrical transmission or interconnection systems having plural supply circuits or sources.
