H03G3/34 - CPC Classification Index

ClassID:

220264 ⎘

H03G3/34 - CPC Classification

Classification description:

Gain control in amplifiers or frequency changers without distortion of the input signal; Automatic control in amplifiers having semiconductor devices Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems

Sub-classes:

H03G3/341 » {Muting when no signals or only weak signals are present } 53
H03G3/342 » {Muting when some special characteristic of the signal is sensed which distinguishes it from noise, e.g. using speech detector } 51
H03G3/344 » {Muting responsive to the amount of noise (noise squelch) } 43
H03G3/345 » {Muting during a short period of time when noise pulses are detected, i.e. blanking } 34
H03G3/348 » {Muting in response to a mechanical action or to power supply variations, e.g. during tuning; Click removal circuits} 135

Recent Application in this class:

20250030391

2025-01-23

POP-CLICK-NOISE (PCN) REDUCTION IN AUDIO DRIVER

20240356511

2024-10-24

SWITCHING AMPLIFIER HAVING LINEAR TRANSITION TOTEM POLE MODULATION

20230098806

2023-03-30

Switching amplifier having linear transition totem pole modulation

20210408991

2021-12-30

Touchless interaction using audio components

20210383824

2021-12-09

Auto mute feature using a voice accelerometer and a microphone

20210065756

2021-03-04

Selectively squelching differential strobe input signal in memory-device testing system

20200044729

2020-02-06

System and method for an integrated vehicle communications system

20190043521

2019-02-07

Automatic gain adjustment for improved wake word recognition in audio systems

20180254760

2018-09-06

Method and apparatus for adaptive transmit power control

#10

20180234064

2018-08-16

Mute pattern injection for a pulse-density modulation microphone

#11

20180167729

2018-06-14

Systems and methods for handling silence in audio streams

#12

20180152164

2018-05-31

Method of switching on and off a power amplifier, related power amplifier circuit, system and computer program product

#13

20170194017

2017-07-06

Audio processing device

#14

20170026014

2017-01-26

Method and apparatus for adaptive transmit power control

#15

20150131815

2015-05-14

Method and apparatus for processing a switched audio signal from a crosspoint router

#16

20140336801

2014-11-13

Acoustic apparatus

#17

20130002357

2013-01-03

Providing automatic power control for a power amplifier

#18

20120218043

2012-08-30

Amplifier activation

#19

20120177225

2012-07-12

Smart un-muting based on system event with smooth volume control

#20

20120163628

2012-06-28

METHOD FOR REDUCING DIGITAL AUDIO OUTPUT NOISE

#21

20110075862

2011-03-31

Method and apparatus for mute control

#22

20110071822

2011-03-24

Selective audio/sound aspects

#23

20110069845

2011-03-24

Selective audio/sound aspects

#24

20110069843

2011-03-24

Selective audio/sound aspects

#25

20110051945

2011-03-03

Reduction of clicking sounds in audio data stream

#26

20100310095

2010-12-09

Method for providing a mute control function for multiple microphones connected to a computer

#27

20100266144

2010-10-21

Audio processing chip and audio signal processing method thereof

#28

20100104109

2010-04-29

Apparatus for preventing leakage of a weak signal from a speaker

#29

20090220106

2009-09-03

AUDIO SIGNAL PROCESSING CIRCUIT

#30

20090196437

2009-08-06

Muting control device, muting control method, and muting control program

#31

20090010457

2009-01-08

AUDIO SIGNAL AMPLIFYING CIRCUIT AND ELECTRONIC DEVICE USING THE SAME

#32

20080278227

2008-11-13

Squelch detection system for high speed data links

#33

20080130908

2008-06-05

Selective audio/sound aspects

#34

20060193476

2006-08-31

External amplifier and noise removing method thereof

#35

20060178876

2006-08-10

Speech signal compression device speech signal compression method and program

#36

20060076998

2006-04-13

Muting circuit for audio amplifier

#37

20050285670

2005-12-29

Audio amplifier

#38

20050135638

2005-06-23

Sound output method and apparatus

#39

20050047499

2005-03-03

System and method for measuring the response time of a differential signal pair squelch detection circuit

#40

16551853

2020-10-13

Selectively squelching differential strobe input signal in memory-device testing system

#41

16398556

2020-03-17

Signal detector