H04M9/10

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№ п/п	Номер патента	Название патента
2012
1	8204198	Method and apparatus for selecting an audio stream
2004
2	6816591	Voice switching system and voice switching method
2003
3	6535604	Voice-switching device and method for multiple receivers
2002
4	6453041	Voice activity detection system and method
2001
5	6175634	Adaptive noise reduction technique for multi-point communication system
2000
6	6091937	Method and apparatus for the automatic adjustment of a switch means for automatic switching between a reception operating mode and a transmission operating mode in a hands-free means of a communication terminal equipment
1999
7	5940499	Voice switch used in hands-free communications system
8	5940486	Two-way communication system with selective muting
9	5867574	Voice activity detection system and method
10	5857019	Apparatus and method for providing a telephone user with control of the threshold volume at which the user's voice will take control of a half-duplex speakerphone conversation
1998
11	5737407	Voice activity detector for half-duplex audio communication system
12	5734987	Noise-controlled communication apparatus
1997
13	5625697	Microphone selection process for use in a multiple microphone voice actuated switching system
14	5598466	Voice activity detector for half-duplex audio communication system
1996
15	5561737	Voice actuated switching system
16	5535433	Hands-free circuitry providing audio signal adjustment based on speaker volume value
1995
17	5467394	Method of improving sidetone attenuation in electroacoustic systems
18	5459786	Loudspeaker telephone device comprising a novel noise suppressing circuit
19	5430796	Auxiliary attenuator arrangement for use in voice-switched speakerphone and method of selectively inserting communication loss in speakerphone paths
1993
20	5212722	Hands-free telephone having a handset volume attenuator for controlling speaker volume in a hands-free adaptor
21	5199065	Method for automatic speech direction reversal, and circuit configuration for performing the method
1991
22	5054061	Hands-free telephone
23	5048082	Voice direction recognition in a digital telephone station
24	4991167	Voice controlled attenuation adjustment in telephone transmission circuits
25	4991166	Echo reduction circuit
26	4982425	Hands-free telephone
1989
27	4879745	Half-duplex speakerphone
1988
28	4764954	Automatic gain control in a loudspeaker telephone set
29	4731832	Process and apparatus for control of a hands-free telephone set operating in alternation between sending and receiving
30	4726062	Duplex hands-free communications circuit
31	4724540	Speakerphone with fast idle mode
32	4720856	Control circuit having a direct current control loop for controlling the gain of an attenuator
1987
33	4710953	Speech control in a telephone station
1985
34	4497980	Handsfree circuit for telephone instrument
35	4492824	Speakerphone linear comparator
1984
36	4488007	Speech-amplifier telephone station
37	4433435	Arrangement for reducing the noise in a speech signal mixed with noise
1983
38	4400584	Speakerphone for radio and, landline telephones
39	4400581	Incoming audio detection circuit for a speaker telephone
40	4385207	Line powered transformerless loudspeaking telephone
41	4378603	Radiotelephone with hands-free operation
1982
42	4359606	Voice switching control system
43	4346261	Speaker phones
44	4319086	Voice switch for hands free communication apparatus
45	4317959	Speech control circuit
46	4315103	Speech-controlled loudspeaker telephone station circuit
1981
47	4293740	Hands free answer intercom
48	4282409	Speech networks for telephone sets
1979
49	4162374	Voice-switched telephone set
50	4161624	Hands-free telephone with cascaded attenuators
51	4156797	Filter for voice operated triggering circuits
52	4147892	Speakerphone with dynamic level discriminator
1978
53	4119797	Voice operated switch having an activation level which is higher than its sustaining level
54	4115658	Two way telephone amplifier
55	4101735	Two-way loudspeaking device for telephone stations
1977
56	4065646	Power converter
57	4051325	Speech intercommunication system
58	4049911	Talk-through unit with voice controlled switching with turn off delay variable from 250-500 milliseconds depending on voice amplitude
59	4025728	Speaker telephone
60	4006310	Noise-discriminating voice-switched two-way intercom system
61	4002854	Loudspeaking telephone instruments
1976
62	3976847	Key telephone system intercom arrangement
63	3970786	Loudspeaking telephone with improved receive sensitivity
64	3963876	Amplifier circuit for increasing transmit and receive levels in a telephone hybrid network
65	3952166	Loudspeaking telephone circuit
66	3946170	Self regulating telephone sets
67	3939311	Muting circuit for subscribers telephone
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