High speed squelch circuit
It is, accordingly, the principle object of this invention to provide a novel and improved squelch circuit wherein the effective time constant under strong signal conditions is short enough to complet... Read More
Inventors: Day, Charles M.;, Assignee: Motorola, Inc. (Corporate Offices) (Schaumburg, IL) |
Muting circuit
What is claimed is: 1. In a receiver including carrier selection means for tuning to a selected signal and further including an information signal demodulator coupled to said carrier selection means a... Read More
Inventors: Anderson, Mark R.; Albean, David L.; Muterspaugh, Max W.;, Assignee: RCA Corporation (Princeton, NJ) |
Data eye monitor
I claim: 1. A data eye monitor for a data input signal comprising: first means for comparing said input signal to a fixed reference voltage; second means for comparing said input signal to a variable ... Read More
Inventors: Couch, Philip R.;, Assignee: International Telephone and Telegraph Corporation (New York, NY) |
Single-sideband radiotelephone system
The present invention relates to a single-sideband radio system which may be used for radiotelephone, radioteletype or for other uses in which at least two audio detectors or filters are employed, the... Read More
Inventors: Frank, Varn Richard; Wysong, Ronald Eugene; Valentine, Michael David;, Assignee: R. L. Drake Company (Miamisburg, OH) |
Wideband FM modulator and AFC control loop therefor
The present invention pertains to an improved digital frequency discriminator for use in a wideband FM modulator, which discriminator utilizes a stable reference frequency source and a counter synchro... Read More
Inventors: Furiga, Andrew; Sabourin, Donald J.;, Assignee: Motorola Inc. (Schaumburg, IL) |
Extremely accurate automatic frequency control circuit and method therefor
The above and other objects are achieved by an automatic frequency control circuit which receives an input signal exhibiting an unknown frequency and resolves the frequency of the signal. The signal i... Read More
Inventors: Deem, Jake O.; Kassik, Ronald W.; Metteer, N. Bruce;, Assignee: Motorola, Inc. (Schaumburg, IL) |
Receiver data gate with automatic gain control
OF THE PREFERRED EMBODIMENT Referring to the Figure, a telephone system, such as a private branch exchange ("PBX") 10 is schematically illustrated. The PBX 10 includes a diplexer 12 which splits inco... Read More
Inventors: Rackin, Mark H.;, Assignee: Solid State Systems, Inc. (Kennesaw, GA) |
Picture transmission system using secondary differential variable sampling rate coding
Accordingly, the principal object of the present invention is to provide a picture transmission system which can improve compression efficiency and remove errors caused in coding, thereby to transmit ... Read More
Inventors: Yuasa, Hiroyoshi; Omura, Koichi;, Assignee: Matsushita Electric Works Ltd. (Osaka, JP) |
Method of rapidly controlling the frequency of a coherent radio receiver and apparatus for carrying out the method
I claim: 1. A method for controlling the frequency of a radio receiver wherein a channel subjected to interference is used to receive signal sequences including at least one synchronizing sequence and... Read More
Inventors: Dent, Paul W.;, Assignee: Telefonaktiebolaget L. M. Ericsson (Stockholm, SE) |
Recorder actuator for communication lines
What is claimed is: 1. An adapter circuit to connect a tape recorder to the input line of a telephone to initiate recording responsive to the voltage drop in the input line, as from the higher "off" v... Read More
Inventors: Williams, Richard W.;, Assignee: |
High speed on-chip clock phase generating system
It is the principal object of the present invention to provide a novel clock system for a processing system that has a synchronized clock circuit on each logic chip in the processing system. It is ano... Read More
Inventors: Boris, Leonard D.; Chodelka, David E.;, Assignee: Unisys Corp. (Blue Bell, PA) |
Phase-locked loop circuit and method
OF THE INVENTION Referring now to the drawings, FIG. 1 shows a block diagram of a first embodiment of the present invention. The principal components of the phase-locked loop (PLL) circuit include a ... Read More
Inventors: Pinto, Victor; Fried, Rafael;, Assignee: National Semiconductor Corporation (Santa Clara, CA) |
Data recovery apparatus and methods
The present invention has been made in view of the above circumstances and has as an object to provide data recovery apparatus for recovering data from multiple low data-rate data streams, without req... Read More
Inventors: Mallard, Jr., William C.;, Assignee: Digital Equipment Corporation (Maynard, MA) |
Multiplexing digital communication system
OF A PREFERRED EMBODIMENT FIG. 1 shows system components that can be incorporated into a broadband or high speed communication system, such as a cable television (CATV) system. These components trans... Read More
Inventors: Farhan, Forrest M.;, Assignee: Scientific-Atlanta, Inc. (Lawrenceville, GA) |
Distributed clocking system
OF THE DRAWINGS An example of a distributed switching network is illustrated in FIG. 1 for interconnecting various types of voice and data equipment. The basic building block of the distributed switc... Read More
Inventors: Cotton, John M.; Necula, Nicholas; Parruck, Bidyut; Tyra, Fryderyk; Wissink, Alex T.; Abreu, Enrique;, Assignee: IPC Information Systems, Inc. (Stamford, CT) |
Distributed clocking system
OF THE DRAWINGS An example of a distributed switching network is illustrated in FIG. 1 for interconnecting various types of voice and data equipment. The basic building block of the distributed switc... Read More
Inventors: Cotton, John M.; Necula, Nicholas; Parruck, Bidyut; Tyra, Fryderyk; Wissink, Alex T.; Abreu, Enrique;, Assignee: IPC Information Systems, Inc. (New York, NY) |
Integrated processor system adapted for portable personal information devices
The problems outlined above are in large part solved by a highly integrated, low-power integrated processor in accordance with the present invention. The integrated processor is fabricated on a single... Read More
Inventors: Buxton, Clark L.; Craycraft, Donald G.; Hawkins, Keith G.; Baum, Gary;, Assignee: Advanced Micro Devices, Inc. (Sunnyvale, CA) |
Method of synchronization status message processing in transmission apparatus
Accordingly, an object of the present invention is to lighten the load on the master shelf by dispersing the synchronization status message detection processing among the shelves (the master shelf and... Read More
Inventors: Meki, Seiji; Yamada, Shunji; Moriyama, Junichi;, Assignee: Fujitsu Limited (Kanagawa, JP) |
Docking station
What is claimed is: 1. A docking station, comprising: a platform; a motion control mechanism operably coupled to said platform; a power source operably coupled to said motion control mechanism; a moun... Read More
Inventors: Ludtke, Harold Aaron; Edwards, Eric D.;, Assignee: Sony Corporation (Tokyo, JP); Sony Electronics, Inc. (Park Ridge, NJ) |
Network clock synchronization
According to the present invention, there is provided a network comprising an exchange having a masterclock and a number of subscriber stations connected to the exchange and arranged to communicate da... Read More
Inventors: Ballance, John W.;, Assignee: British Telecommunications Public Limited Company (London, GB) |
Digital delay system and method for digital cross connect telecommunication systems
The present invention provides a digital delay system and method for a digital cross connect system that substantially eliminates or reduces disadvantages and problems associated with previously devel... Read More
Inventors: McCallan, Christopher B.;, Assignee: Alcatel Network Systems, Inc. (Richardson, TX) |
Apparatus for an improved ISDN terminal adapter having baud rate unblocking and methods for use therein
The present invention overcomes the deficiencies in the art and satisfies this need by providing an ISDN terminal adapter which provides automatic ISDN switch detection, automatic SPID (service profil... Read More
Inventors: Brennan, Daniel M.;, Assignee: 3Com Corporation (Santa Clara, CA) |
A/D, D/A Converter for PCM transmission system
It is, therefore, an object of the present invention to provdide a codec which can be commonly adopted in transmission systems which use read/write clocks having a frequency different from one another... Read More
Inventors: Yamasawa, Masao; Ohhata, Michinobu; Ikezawa, Toshi;, Assignee: Fujitsu Limited (Kawasaki, JP) |
Start-stop synchronous communication speed detecting apparatus
It is an object of the present invention to provide a start-stop synchronous communication speed detecting apparatus capable of detecting a communication speed without performing any software processi... Read More
Inventors: Hiraguchi, Masayoshi; Hattori, Masanori;, Assignee: NEC Corporation (JP) |
Modem for connection to a telephone line through a either portable computer connector or a docking station
It is therefore one object of the present invention to provide an improved telephone connection via a modem in a portable (laptop) computer which has a docking station. It is another object of the pre... Read More
Inventors: Tran, Huyen B.; Castell, Robin T.;, Assignee: Compaq Computer Corporation (Houston, TX) |
Adaptive time division duplexing method and apparatus for dynamic bandwidth allocation within a wireless communication system
The present invention is an adaptive time division duplexing (ATDD) method and apparatus for duplexing transmissions in wireless communication systems. The present ATDD invention facilitates the effic... Read More
Inventors: Gilbert, Sheldon L.; Hadar, Rami; Klein, Israel J.;, Assignee: Ensemble Communications, Inc. (San Diego, CA) |
Fast retrain based on communication profiles for a digital modem
A digital modem that supports fast retrain based on communication profiles according to the present invention includes a memory that stores a plurality of communication profiles. The modem also includ... Read More
Inventors: Hamdi, Rabah S.;, Assignee: Compaq Computer Corporation (Houston, TX) |
Digital phase locked loop having coarse and fine stepsize variable delay lines
It is therefore an object of the present invention to provide a digital phase locked loop having reduced jitter. According to the present invention, there is provided a digital phase locked loop for u... Read More
Inventors: Saitoh, Tetsuo; Matsuo, Syuji; Taniyoshi, Itsurou; Kitamura, Koichi;, Assignee: NEC Corporation (JP) |
ASIC cell implementation of a bus controller with programmable timing value registers for the apple desktop bus
An ASIC cell implementation of an ADB bus controller for the Apple Desktop Bus has a system interface for connecting to a computer system, and an ADB Interface for connecting to an Apple Desktop Bus. ... Read More
Inventors: Scalise, Albert M.;, Assignee: Apple Computer, Inc. (Cupertino, CA) |
System for initializing a self-timed link
Briefly, the present invention satisfies the need for a way to initialize a self-timed link by providing a protocol that takes into account the unreliable data patterns produced before initialization.... Read More
Inventors: Barkey, Kathy Sue; Garmire, Derrick LeRoy; Roman, Harold Edgar; Smyth, Daniel Gerard;, Assignee: International Business Machines Corporation (Armonk, NY) |
Multiplexer-related 
