with conversion of a single frequency signal into a digital signal

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H04Q1/448

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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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H04Q1/448with conversion of a single frequency signal into a digital signal

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Patents Grantslast 30 patents

Information Patent Grant
Method for suppressing quantization noises superimposed on a sinuso...
- Patent number 5,099,498
- Issue date Mar 24, 1992
- Siemens Aktiengesellschaft
- Werner Nagler
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
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
Detection of single-frequency signals
- Patent number 4,849,688
- Issue date Jul 18, 1989
- Dialogic Corporation
- Christian J. Chuba
- 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
Signal detection and discrimination using waveform peak factor
- Patent number 4,696,031
- Issue date Sep 22, 1987
- Wang Laboratories, Inc.
- Richard L. Freudberg
- 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
Apparatus for detecting in-band single frequency signaling tones fr...
- Patent number 4,590,595
- Issue date May 20, 1986
- Yo Morimura
- 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
AC Signal-activated switching apparatus
- Patent number 4,550,225
- Issue date Oct 29, 1985
- Keptel, Inc.
- Daniel Lynch
- 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
Frequency signaling method and apparatus with dynamic compensation...
- Patent number 4,401,860
- Issue date Aug 30, 1983
- Bell Telephone Laboratories, Incorporated
- Jim E. Walls
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Frequency comparator circuit
- Patent number 4,322,686
- Issue date Mar 30, 1982
- Thomson-CSF
- Henri Butin
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Tone signal detectors
- Patent number 4,313,107
- Issue date Jan 26, 1982
- Nippon Electric Co., Ltd.
- Toshihiro Mori
- G08 - SIGNALLING
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
Tone signal detector
- Patent number 4,231,018
- Issue date Oct 28, 1980
- Nippon Electric Co., Ltd.
- Masayuki Imigawa
- 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
Variable peak detector
- Patent number 4,199,729
- Issue date Apr 22, 1980
- Compagnie Industrielle des Telecommunications Cit-Aicatel
- Jean-Michel Durand
- G01 - MEASURING TESTING
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
Frequency selective detector circuit
- Patent number 4,097,812
- Issue date Jun 27, 1978
- Matsushita Electric Corporation
- Theodore S. Rzeszewski
- G08 - SIGNALLING
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
Digital detector
- Patent number 4,047,114
- Issue date Sep 6, 1977
- The United States of America as represented by the Secretary of the Army
- Richard A. Lane
- G01 - MEASURING TESTING
Information Patent Grant
Circuit arrangement for evaluating received oscillations of a prede...
- Patent number 4,034,300
- Issue date Jul 5, 1977
- Licentia Patent-Verwaltungs-GmbH
- Wulf-Christian Streckenbach
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Tone receiver
- Patent number 3,993,875
- Issue date Nov 23, 1976
- Houston Natural Gas Corporation
- Theran L. Ebner
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Digital tone detector using concatenated detection intervals
- Patent number 3,990,006
- Issue date Nov 2, 1976
- Bell Telephone Laboratories, Incorporated
- Timothy James Zebo
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Decoder
- Patent number 3,979,562
- Issue date Sep 7, 1976
- Dale E. Rice
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
3927260
- Patent number 3,927,260
- Issue date Dec 16, 1975
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

with conversion of a single frequency signal into a digital signal

Industry

Parent Industries

Current Industry

Patents Grantslast 30 patents

Method for suppressing quantization noises superimposed on a sinuso...

Digital composite tone alerting

Detection of single-frequency signals

Audio frequency signal identification apparatus

Signal detection and discrimination using waveform peak factor

Switching system having tone trunk

Apparatus for detecting in-band single frequency signaling tones fr...

Tone receiver for digital data communication systems

AC Signal-activated switching apparatus

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...

Frequency signaling method and apparatus with dynamic compensation...

Frequency comparator circuit

Tone signal detectors

Single frequency tone receiver

Tone signal detector

Method and apparatus for testing tone generators

Variable peak detector

Digital signal detector

Device for detecting a frequency in a PCM coded signal

Frequency selective detector circuit

Sampled signal detector

Digital detector

Circuit arrangement for evaluating received oscillations of a prede...

Tone receiver

Digital tone detector using concatenated detection intervals

Decoder

3927260

Patents Applicationslast 30 patents