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H04Q1/4485

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HELECTRICITY H04Electric communication H04QSELECTING H04Q1/00Details of selecting apparatus or arrangements for establishing connections among stations for the purpose of transferring information via these connections

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H04Q1/4485which is transmitted in digital form

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Patents Grantslast 30 patents

Information Patent Grant
Digital composite tone alerting
- Patent number 4,972,466
- Issue date Nov 20, 1990
- Northern Telecom Limited
- Guy Quesnel
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Audio frequency signal identification apparatus
- Patent number 4,797,931
- Issue date Jan 10, 1989
- Kokusai Denshin Denwa Co., Ltd.
- Yasuo Furukawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Switching system having tone trunk
- Patent number 4,680,758
- Issue date Jul 14, 1987
- Fujitsu Limited
- Masayuki Kumazaki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Tone receiver for digital data communication systems
- Patent number 4,563,681
- Issue date Jan 7, 1986
- International Business Machines Corporation
- Dominique Godard
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Digital automatic gain control circuit for PCM signals
- Patent number 4,539,692
- Issue date Sep 3, 1985
- Northern Telecom Limited
- Ernst A. Munter
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Digital circuit for determining the envelope frequency of PCM encod...
- Patent number 4,534,041
- Issue date Aug 6, 1985
- Northern Telecom Limited
- Ernst A. Munter
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Call progress signal monitor and method for telephone systems
- Patent number 4,528,664
- Issue date Jul 9, 1985
- Northern Telecom Limited
- Chao-Jan Cheng
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Digital circuit and method for the detection of call progress tones...
- Patent number 4,439,639
- Issue date Mar 27, 1984
- Northern Telecom Limited
- Ernst A. Munter
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Single frequency tone receiver
- Patent number 4,277,650
- Issue date Jul 7, 1981
- Northern Telecom Limited
- Inez F. Arend
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Method and apparatus for testing tone generators
- Patent number 4,218,589
- Issue date Aug 19, 1980
- Wescom Switching, Inc.
- Satyan G. Pitroda
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Digital signal detector
- Patent number 4,197,502
- Issue date Apr 8, 1980
- Motorola, Inc.
- Terence E. Sumner
- G01 - MEASURING TESTING
Information Patent Grant
Device for detecting a frequency in a PCM coded signal
- Patent number 4,194,092
- Issue date Mar 18, 1980
- Compagnie Industrielle des Telecommunications
- Jacques Luder
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Sampled signal detector
- Patent number 4,064,488
- Issue date Dec 20, 1977
- Motorola, Inc.
- Ronald Howard Chapman
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
3435149
- Patent number 3,435,149
- Issue date Mar 25, 1969
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

which is transmitted in digital form

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Current Industry

Patents Grantslast 30 patents

Digital composite tone alerting

Audio frequency signal identification apparatus

Switching system having tone trunk

Tone receiver for digital data communication systems

Digital automatic gain control circuit for PCM signals

Digital circuit for determining the envelope frequency of PCM encod...

Call progress signal monitor and method for telephone systems

Digital circuit and method for the detection of call progress tones...

Single frequency tone receiver

Method and apparatus for testing tone generators

Digital signal detector

Device for detecting a frequency in a PCM coded signal

Sampled signal detector

3435149

Patents Applicationslast 30 patents