ClassID:

219176

H03F1/327 - CPC Classification

Classification description:

Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements; Modifications of amplifiers to reduce non-linear distortion using predistortion circuits in audio amplifiers to emulate discharge tube amplifier characteristics

Recent Application in this class:
#1
20240178799
2024-05-30

AMPLIFIER

#2
20210201879
2021-07-01

Amplifier for music signal and method of outputting waveform of music signal

#3
20200279546
2020-09-03

Amplifier matching in a digital amplifier modeling system

#4
20190068138
2019-02-28

Vacuum tube audio amplifier

#5
20190028068
2019-01-24

Amplifier with digital linearization and multiple output stages

#6
20160268986
2016-09-15

Power amplifier and input signal adjusting method

#7
20140219474
2014-08-07

Method of reducing un-correlated noise in an audio processing device

#8
20130094673
2013-04-18

Method and apparatus for outputting audio signal

#9
20130034249
2013-02-07

SOLID STATE AUDIO POWER AMPLIFIER

#10
20120195441
2012-08-02

Method of outputting audio signal and audio signal output apparatus using the method

#11
20090058530
2009-03-05

High-voltage transconductance circuit

#12
20080272840
2008-11-06

Multiple-input and multiple-output amplifier

#13
20080260183
2008-10-23

Communication method for vacuum tube replacement devices

#14
20080204131
2008-08-28

Vacuum tube replacement device, circuit and system

#15
20070285156
2007-12-13

Expanded performance and functions for vacuum tube replacement devices

#16
20070177745
2007-08-02

Tube amp simulator

#17
20070035408
2007-02-15

Indicators for vacuum tube replacement devices

#18
20060012424
2006-01-19

Methods and apparatus for variable harmonic distortion

#19
20050201573
2005-09-15

Musical instrument audio amplifier circuit and system for producing distortion effects

#20
16785168
2020-12-29

Configurable dual vacuum tube triode amplifier