US Patent No: 5,371,783

Number of patents in Portfolio can not be more than 2000

Method for continually monitoring the status of a radio frequency link

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Importance

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Abstract

A digital cordless telephone apparatus comprising a microprocessor based battery powered portable handset unit and a microprocessor based stationary base unit which each transmit and receive digital voice data and digital command data to and from one another over multiple RF channel frequencies in the 902-928 MHz band, is disclosed. The user's voice is digitized, scrambled and modulated for transmission and upon reception, the modulated digital voice data signal is demodulated, descrambled and decoded. A command data--voice data interface inserts command data packets into the stream of digital voice data prior to transmission and locates and captures command data packets from the incoming stream of received digital data. A silence sequence replaces the captured command data packet such that no audible sound is heard by the user. A link check command signal is also periodically transmitted by the base unit and acknowledged by the handset unit to evaluate the quality of the RF link toward triggering an automatic channel change or signaling an out-of-range condition.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
VIDEO TECHNOLOGY ENGINEERING, LTD.HONG KONG6

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Heung, Charley Richmond, CA 2 123
Rose, Chris Miami, FL 3 128

Cited Art

Patent Info (Count) # Cites Year
 
INTERNATIONAL MOBILE MACHINES CORPORATION (1)
4,785,450 Apparatus and method for obtaining frequency agility in digital communication systems 78 1987
 
NTT MOBILE COMMUNICATIONS NETWORK INC. (1)
4,939,785 Radio communication network system comprising a connecting equipment unit operable in different modes 20 1988

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
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8,150,357 Smoothing filter for irregular update intervals 1 2008
8,238,298 Picking an optimal channel for an access point in a wireless network 0 2008
8,161,278 System and method for distributing keys in a wireless network 1 2009
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8,116,275 System and network for wireless network monitoring 5 2010
 
JUNIPER NETWORKS, INC. (3)
8,072,952 Load balancing 0 2007
8,064,939 Wireless load balancing 0 2009
8,320,949 Wireless load balancing across bands 2011
 
LUCENT TECHNOLOGIES INC. (3)
5,752,185 Disconnection management system for wireless voice communications 56 1994
5,581,190 Method and apparatus for testing RF devices 4 1995
7,231,207 Intelligent incoming call management during cordless intercom mode 1 2000
 
THOMSON LICENSING (3)
5,666,658 Wireless signal transmission system, method and apparatus 18 1995
6,215,981 Wireless signal transmission system, method apparatus 20 1997
6,832,082 Initialization of handsets in a multi-line wireless phone system for secure communications 24 2000
 
VTECH COMMUNICATIONS, LTD. (3)
5,586,141 Interface protocol method for use in a frequency hopping radio system having first hopping code for synchronization and second hopping code for communication 14 1994
7,027,424 Method for avoiding interference in a digital communication system 4 2000
7,990,933 Method for avoiding interference in a digital communication system 0 2006
 
SAMSUNG ELECTRONICS CO., LTD. (2)
6,035,204 Method for releasing call in cordless telephone 2 1997
6,205,338 Intercommunication method between portable units in TDMA cordless telephone system 5 1998
 
AGERE SYSTEMS INC. (1)
6,363,257 Method, apparatus, and communication protocol for transmitting control data with an improved error correction capability in a digital cordless telephone system 5 1999
 
APPLE INC. (1)
5,809,414 User out-of-range indication for digital wireless systems 44 1995
 
AVAYA INC. (1)
6,463,299 Method and apparatus providing an integral computer and telephone system 53 1998
 
CISCO TECHNOLOGY, INC. (1)
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ERICSSON INC. (1)
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GATEWAY, INC. (1)
6,459,896 Notification of low-battery in a wireless network 16 1999
 
IGT (1)
8,078,868 Multi-party encryption systems and methods 0 2011
 
INTEL CORPORATION (1)
7,729,674 Multiband or multimode receiver with shared bias circuit 0 2007
 
ITALTEL S.P.A. (1)
6,088,338 Method and system for the determination of the PSCN parameter starting from the MFN parameter in a DECT cordless telephone system 5 1997
 
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1)
6,526,276 Electric field detecting method 0 1999
 
MOTOROLA MOBILITY LLC (1)
6,134,237 Method and apparatus for tracking data packets in a packet data communication system 51 1997
 
TRAPEZE NETWORKS (1)
7,912,982 Wireless routing selection system and method 10 2006
 
VTECH TELECOMMUNICATIONS LIMITED (1)
7,693,488 System and method for asymmetric enhanced mode operation in a digital communication system 0 2004
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (2)
6,269,258 Telephone handset especially for use in a vehicle 7 1997
7,068,783 Telephone set with a handset having a mouthpiece and/or an earpiece 4 2001