H04M3/40 - CPC Classification Index

#1

20240040043

2024-02-01

ACOUSTIC FEEDBACK MANAGEMENT IN REAL-TIME AUDIO COMMUNICATION

#2

20190103125

2019-04-04

System and method for dynamic optical microphone

#3

20180115650

2018-04-26

Device for assisting two-way conversation and method for assisting two-way conversation

#4

20140370858

2014-12-18

CALL DEVICE AND VOICE MODIFICATION METHOD

#5

20140226806

2014-08-14

Methods and apparatus for enhancing ringback tone quality during telephone communications

#6

20130329863

2013-12-12

System and method to use enterprise communication systems to measure and control workplace noise

#7

20110317825

2011-12-29

Enhancement of audio conference productivity through gain biasing

#8

20110137644

2011-06-09

Speech signal processing to improve naturalness

#9

20110044474

2011-02-24

System and Method for Adjusting an Audio Signal Volume Level Based on Whom is Speaking

#10

20110002229

2011-01-06

Dynamic management of end-to-end network loss during a phone call

#11

20100272248

2010-10-28

Voice communications apparatus

#12

20080070536

2008-03-20

METHOD AND APPARATUS FOR ESTIMATING AND CONTROLLING INITIAL TIME SLOT GAIN IN A WIRELESS COMMUNICATION SYSTEM

#13

20070297620

2007-12-27

Methods and Systems for Producing a Zone of Reduced Background Noise

#14

20070140469

2007-06-21

Multi-stage differential warping amplifier and method

#15

20070081657

2007-04-12

Methods and apparatus for enhancing ringback tone quality during telephone communications

#16

20060291457

2006-12-28

Cross-connected cable interconnection

#17

20060274731

2006-12-07

Voice processing device, communication apparatus and program product

#18

20060182267

2006-08-17

Method and system for adjusting line interface level to compensate for induced loss

#19

20060114891

2006-06-01

Terminal apparatus and control method of the terminal apparatus

#20

20060111061

2006-05-25

Method and apparatus for estimating and controlling initial time slot gain in a wireless communication system

#21

20060106472

2006-05-18

Method and apparatus for normalizing sound recording loudness

#22

20060098804

2006-05-11

High performance ADSL line conditioner system and method

#23

20060072730

2006-04-06

Systems and methods of changing attributes of voice calls over a circuit-based network

#24

20060029207

2006-02-09

Amplifier for unshielded twisted pair wire signals

#25

20060018306

2006-01-26

IP telephone system, IP telephone apparatus and communications method

#26

20060013370

2006-01-19

Voice communications apparatus

#27

20060002527

2006-01-05

Network telephone system and telephone terminal

#28

20050259636

2005-11-24

Voice over internet protocol system having dynamic gain control function and method thereof

#29

20050185770

2005-08-25

Voice interface board for providing operator services

#30

20050135515

2005-06-23

Method and apparatus for estimating and controlling initial time slot gain in a wireless communication system

#31

20050105717

2005-05-19

Telephony interface apparatus

#32

20050069114

2005-03-31

Method and apparatus for improving nuisance signals in audio/video conference

#33

20050055202

2005-03-10

Call method, call apparatus and call system

#34

20050018862

2005-01-27

Digital signal processing system and method for a telephony interface apparatus