СПИСОК патентов США - подгруппа МПК16 H04Q1/453


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№ п/п Номер патента Название патента

2016

19401998Robust DTMF detection in an unreliable voice-over-IP (VoIP) environment

2015

29055145Recovery of DTMF tones in the presence of periodic interference and obstruction

2004

36728369Method and device for distinguishing among a plurality of devices and data elements with a sequence of signals

2002

46493441Method of controlling telecommunications signalling

2001

56259691System and method for efficiently transporting dual-tone multi-frequency/multiple frequency (DTMF/MF) tones in a telephone connection on a network-based telephone system

2000

66078660Method and device for decoding a sequence of signals
76035179Transmission of voice-frequency signals in a mobile telephone system

1999

85982874Transmission system with improved tone detection
95978676Inband signal converter, and associated method, for a digital communication system
105978388Tone generator
115963643Method and system for the transfer of information between two populations of persons, one nomadic and the other sedentary
125907597Method and system for the secure communication of data
135878131Interference attenuation for acoustic-dialers
145859913Method and system for the high-speed generation and transmission of a sequence of characters by means of voice frequencies

1998

155835574Dual-tone multi-frequency signal transfer protocol
165825871Information storage device for storing personal identification information
175818930Auto-dialer housing
185809133DTMF detector system and method which performs frequency domain energy calculations with improved performance
195793862Information signal detection device and information signal detection method
205781626Communication device capable of controlling transmission parameters of outputted DTMF signals
215781625System and apparatus for generating within the premises a dial tone for enhanced phone services
225745555System and method using personal identification numbers and associated prompts for controlling unauthorized use of a security device and unauthorized access to a resource
235732133System and method for selecting and generating telephone access numbers for limiting access to a telephone service
245710808Telephone dialling code processor

1997

255699421Telephone answering device with low cost dual tone multi-frequency detector
265694466DTMF detector system and method which performs improved twist computation and thresholding
275644634System and method for dual tone multifrequency detection using variable frame widths
285592544DTMF signal judging apparatus

1996

295588053DTMF detector system and method which performs static and dynamic thresholding
305588052DTMF signal judging apparatus
315583933Method and apparatus for the secure communication of data
325524139System for automatic access to automated telephonic information services
335506885Method of adapting processing parameters in a call processing system

1995

345459785DTMF signal receiving circuit
355428680DTMF signal receiving apparatus equipped with a DTMF signal judging circuit
365422945Fast last digit detection of a dialed telephone number
375416835Automatic signaling-type indicator for use in subsequent interactive dialing
385398031DTMF signal generating circuit

1994

395375166Communication apparatus with cross-talk protection
405369693Telephonic telemeeting system
415359652Tone receiver comprising a switch capacitor zero crossing detector
425347611Apparatus and method for transparent tone passing over narrowband digital channels
435325427Apparatus and robust method for detecting tones
445307404Signal detecting device

1993

455241591Telephone system having a dial data changeover switch
465214693Multi-frequency signal receiver and a method of detecting the multi-frequency signal
475177781Dialing pulse signature recognizing method and device

1992

485163050Configurable parameter DTMF detector
495117369DTMF receiver
505086456Dial unit detachably mounted on public telephone for equal access

1991

515073941Multifrequency detection

1990

524922528Circuitry for recognizing two-tone compound signals in telephone installations
534922527Small electronic apparatus

1989

544868872Telephone tone detector
554796287Digital loudspeaking telephone

1986

564626629Digital multifrequency signal receiver
574626628Telephone line circuit having time-shared DTMF receivers
584604755Feed forward dual channel automatic level control for dual tone multi-frequency receivers

1985

594554542Guard tone capture method
604502049Universal signalling tone receiver

1983

614385208Multifrequency receiver

1982

624313038DTMF Signal receiver

1981

634286221Multi-frequency signal receiving apparatus
644273965Tone decoding circuit

1980

654227055Multifrequency receiver
664206323Dual tone multifrequency signal receiver

1979

674169969Apparatus for detecting in-band signalling signals
684153819Telephone tone signalling receiver with up-conversion of frequency of tones controlled by word instructions
694145580Multi-frequency signal receiver
704140880Hold tone scanner

1978

714130736Telecommunication system with keyboard selection
724091243Multifrequency signal receiver
734085295Multi-frequency signal receivers

1977

744048450Trunk circuit traffic analyzer

1976

753971899Signalling device for key telephone systems
763961143Multi-frequency signalling system
773961141Stop time-out until after first DTMF digit dialed circuit
783941944Signalling device for key telephone systems
793936801Multifrequency signal receiver timing circuit
803934096Multi-frequency signal receiving circuit
© 2017, ПАТ-Инфо, В.И. Карнышев
Дата формирования списка: 03.04.2017