СПИСОК патентов США - подгруппа МПК16 H04Q1/444


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№ п/п Номер патента Название патента

2005

16888925Method for testing large-scale audio conference servers

2003

26650627Tone detection in communication networks

2002

36366652Method and apparatus for using a VM tone to prevent a voice announcement in a group call

2001

46172985Automatic detection of pots line

2000

56154645Method and apparatus for using a MS tone to prevent a voice announcement in a group call
66122652Tone and periodical signal detection

1998

75790653Line-powered detection of call progress tones
85764758Interrupted tone converter
95719932Signal-recognition arrangement using cadence tables

1994

105363443Differing frequency sine wave generation from a look-up table
115353344Method of determining levels at given frequencies of a VF signal
125353342Adaptive multitone signaling method
135349254Call progress detection circuit
145311589Apparatus and method for audible signaling tone recognition
155311588Call progress detection circuitry and method

1993

165263081Method and apparatus for providing on-hook transmission for digital loop carrier channel units
175251256Independent hysteresis apparatus for tone detection
185241579Status management method of a signalling service device in an electric switching system

1992

195127004Tone and announcement message code generator for a telephonic switching system and method

1990

204912755Line current test device

1989

214868872Telephone tone detector
224811386Called party response detecting apparatus

1987

234686699Call progress monitor for a computer telephone interface

1982

244313038DTMF Signal receiver

1980

254219699Telephone supervision system using DTMF signals
264204094Tone applying line circuit

1977

274051385Active networks and signalling equipment
284002848Toll fraud eliminator for telephone systems
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Дата формирования списка: 03.04.2017