Continuous time delta-sigma modulator
In accordance with the teachings of the present invention, an analog-to-digital converter is disclosed that employs delta-sigma technology, and has particular use in a receiver for a wireless telecomm... Read More
Inventors: Oyama, Bert K.; Skones, William M.;, Assignee: TRW Inc. (Redondo Beach, CA) |
Apparatus for producing a radio-frequency signal
What is claimed is: 1. Apparatus for producing a non-constant-envelope radio frequency signal comprising: a) an input for a baseband signal; b) means for generating from the baseband signal a modulate... Read More
Inventors: Wilson, Nigel; Hillum, Rick A.;, Assignee: Securicor Wireless Technology Limited (GB) |
Digital filter-type frequency demultiplexing device
Accordingly, a demultiplexing device embodying the invention demultiplexes frequency multiplexed channels in a multicarrier sampled signal with a predetermined useful frequency bandwidth. The channels... Read More
Inventors: Guo, Xiao Y.; Maral, Gerard;, Assignee: France Telecom (Paris, FR) |
Personal base station extension calling arrangement
The present invention includes methods and apparatus for PBS extension calling between two wireless subscribers and a third party connected through an external communication network that requires redu... Read More
Inventors: Cheng, James Y.; Chou, Shao-Ning; Kroon, Peter;, Assignee: Lucent Technologies, Inc. (Murray Hill, NJ) |
Gated transmission in control hold state in CDMA communication system
It is, therefore, an object of the present invention to provide a device and method for suppressing the unnecessary transmission of a control signal in a control hold state in a CDMA communication sys... Read More
Inventors: Park, Su-Won; Kim, Young-Ky; Ahn, Jae-Min; Kim, Jae-Yoel; Kang, Hee-Won;, Assignee: Samsung Electronics, Co., Ltd. (KR) |
PN sequence identifying device in CDMA communication system
It is, therefore, an object of the present invention to provide a device and method for identifying a PN sequence using on/off keying in an asynchronous CDMA communication system, in order to reduce t... Read More
Inventors: Park, Su-Won; Lee, Hyun-Kyu;, Assignee: Samsung Electronics Co., Ltd. (KR) |
Data transmitter
What is claimed is: 1. A data transmission device comprising: a driver for sending data; a receiver for receiving data sent from the driver; a transmission line path for connecting between the driver ... Read More
Inventors: Yoshikawa, Takefumi; Iwata, Toru; Yamauchi, Hiroyuki;, Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP) |
Television transmission system using two stages of spead-spectrum processing
What is claimed is: 1. A spread-spectrum transmission system for transmitting a television signal, said system comprising: a source coder dividing the television signal into a first stream of data and... Read More
Inventors: Schreiber, William F.;, Assignee: |
Messaging communication protocol
The present invention uses an acoustic modem embedded in a remote device enhanced with automatic repeat-request and forward-error-correction routines to provide reliable transfer of electronic message... Read More
Inventors: Chen, Zongbo; Langill, Wade; Koralek, Richard W.; Korek, Brian D.; Beerman, Richard C.;, Assignee: PocketScience, Inc. (Santa Clara, CA) |
Multi-path data synchronizer system and method
What is claimed is: 1. Apparatus for synchronizing the transfer of data over conductors from a transmitting unit having a first clock signal to a receiving unit having a second clock signal, where the... Read More
Inventors: Wicki, Thomas M.;, Assignee: Hal Computer Systems, Inc. (Campbell, CA) |
Domain access control for logging systems
These needs are met by the invention, which associates with each log a list of one or more "owners", users who have access to that log. When an event notification is received, a set of access control ... Read More
Inventors: Brinnand, John P.; Angal, Rajeev; Pagadala, Balaji V.;, Assignee: Sun Microsystems, Inc. (Santa Clara, CA) |
Add drop multiplexer
The principal object of the present invention is to provide an add drop multiplexer, in which the signal delay in a pass-through line is small, taking into account the application thereof to a loop ty... Read More
Inventors: Ashi, Yoshihiro; Kanno, Tadayuki;, Assignee: Hitachi, Ltd. (Tokyo, JP) |
Collision signal detection system
What is claimed is: 1. A collision signal detection system for shared-multi-user, frequency-division-multiplexed transmission media comprising: a plurality of stations connected to the shared, multi-u... Read More
Inventors: Abraham, Menachem; Linde, Yoseph; Saussy, Gordon C.;, Assignee: Chipcom Corporation (MA) |
Arbiter switch for a concurrent network of processors
In order to achieve the above-identified objects, the present invention is directed toward an arbiter switch to receive a transmission from one of two input ports and to transmit that message to its o... Read More
Inventors: Bolton, Brent C.; Logsdon, Gary L.; Hagenmaier, Jr., Carl F.; Wilson, Jesse R.;, Assignee: Burroughs Corporation (Detroit, MI) |
Composite video signal generation method and device
An object of the present invention is to provide a composite video signal generation method and device wherein processes are carried out by a digital circuit which includes balance-modulation circuits... Read More
Inventors: Ogawa, Kiyotaka; Kobatake, Shozo; Kohiyama, Kiyoshi; Otobe, Yukio;, Assignee: Fu Jitsu Limited (Kawasaki, JP) |
Color mixing or interference reduction circuit in color TV decoding circuits
The luminance signal is applied to terminal 1 (FIG. 1) to be transmitted to a color television (TV) coder at terminal 7. The TV coder can be in accordance with any well-known and suitable structure a... Read More
Inventors: Hausdorfer, Michael;, Assignee: Robert Bosch GmbH (Stuttgart, DE) |
Digital VSB detector with bandpass phase tracker using Ng filters, as for use in an HDTV receiver
FIG. 1 shows a VSB signal receiver 5 for receiving digital HDTV signals from a broadcast receiving antenna 6. This receiver 5 recovers red (R), green (G) and blue (B) drive signals for a kinescope 7 ... Read More
Inventors: Patel, C. B.; Limberg, Allen LeRoy;, Assignee: Samsung Electronics Co., Ltd. (Kyungki-do, KR) |
Radio communication apparatus for rapidly knowing whether the apparatus is within or out of a service area
What is claimed is: 1. A radio communication apparatus for receiving radio signals at a predetermined period when supplied with an electric power from a power source, each of said radio signals carryi... Read More
Inventors: Kudoh, Kazuhiro;, Assignee: NEC Corporation (Tokyo, JP) |
Selective call receiver with a universal synchronization code operating mode
OF THE INVENTION Referring to FIG. 1, a selective call system in accordance with a preferred embodiment of the present invention transmits two types of signals: information services signals and perso... Read More
Inventors: Mun, Kyung T.; Ganucheau, Jr., Charles J.; Nelson, Leonard E.;, Assignee: Motorola, Inc. (Schaumburg, IL) |
Color signal demodulation circuit and method therefor
Accordingly, an objective of the present invention is to provide a color signal demodulation circuit which demodulates a color signal without adjusting the hardware, while adapting to input color sign... Read More
Inventors: Ban, Young-gyun;, Assignee: Samsung Electronics Co., Ltd. (Kyungki-do, KR) |
Progressive scan speed-up processor
OF THE INVENTION Referring to FIG. 1, an analog composite interlaced-scan color television signal is applied to terminal 1 from a source (not shown). The source of the analog signal may be the demodu... Read More
Inventors: Sepp, Walter E.;, Assignee: RCA Corporation (Princeton, NJ) |
Video processing circuit
Referring to the drawings and particularly to FIG. 1, illustrating an embodiment of a video processing circuit according to the present invention in block diagram form, a video input signal, e.g. a c... Read More
Inventors: Karlock, James A.;, Assignee: |
Echo canceller using parametric methods
The present invention overcomes the deficiencies of the prior art by providing an adaptive echo canceller which parametrically models the echo path in terms of the transfer function poles and zeros. M... Read More
Inventors: Ardalan, Sasan H.; Alexander, Samuel T.;, Assignee: North Carolina State University (Raleigh, NC) |
Frequency domain automatic equalizer using minimum mean square error correction criteria
An object of the invention is to provide a frequency domain equalizer employing the discrete. Fourier transform and a frequency correction feedback circuit which is operable to produce a minimum mean ... Read More
Inventors: Perreault, Donald A.;, Assignee: Xerox Corporation (Stamford, CT) |
Decision-directed control circuit
FIG. 1 shows an illustrative decision-directed control circuit 100, in accordance with the present invention, comprising a receiver 101 and a controller 102. Receiver 101 includes signal processor 10... Read More
Inventors: Meyers, Martin H.;, Assignee: American Telephone and Telegraph Company (New York, NY); Bell Telephone Laboratories, Incorporated (Murray Hill, NJ) |
Equalization system and method for equalizing a base-band telecommunication line
These and other objects of the invention are provided by means of the equalization system according to the present invention which includes filtering means for compensating the frequency attenuation o... Read More
Inventors: Ballatore, Daniel;, Assignee: International Business Machines Corporation (Armonk, NY) |
Decision feedback equalizer with expansion and decision circuit
It is, therefore, an object of the present invention to provide a decision feedback equalizer capable of equalizing a received signal even when an interference wave of substantially the same level as ... Read More
Inventors: Mizoguchi, Shoichi;, Assignee: NEC Corporation (Tokyo, JP) |
Curved grating surface emitting distributed feedback semiconductor laser
The present invention contemplates a broad area surface emitting distributed feedback semiconductor laser diode device that incorporates a curved pattern in a second order grating to produce a predomi... Read More
Inventors: Macomber, Steven H.;, Assignee: Hughes Aircraft Company (Los Angeles, CA) |
Modem and data communication system
The present invention provides a modem and data communication system employable on high frequency channels to communicate data over relatively long distances. In accordance with one aspect of the pres... Read More
Inventors: Rhodes, Scott A.;, Assignee: Transcom Australia Limited (Western Australia, AU) |
Data transmission apparatus and method and data communication system conducting variable bit-rate data transmission
The present invention has been made in view of the above circumstances and has as an object a data transmission apparatus, a data transmission method which prevent severe increase of the transmission ... Read More
Inventors: Kawase, Fumiyoshi; Hisanaga, Takanori; Kamizawa, Koh;, Assignee: Fuji Xerox Co., Ltd. (Tokyo, JP) |
Multiplexer-related 
