Pradeep P Kaul, Age 754821 Montgomery Ln UNIT 1002, Bethesda, MD 20814

4363094, Dec 7, 1982

Jun 4, 1980

6/156451

Pradeep Kaul - Rockville MD
Daniel Wendling - Rockville MD
Harold Ford - Germantown MD
Christopher Newport - Annandale VA

M/A-COM DDC, Inc. - Germantown MD

G06F 1300

364200

A flexible, modular communications processor is disclosed comprised of a plurality of microprocessors. A demand assigned bus is provided to couple the microprocessors through an arbitrator to an information storage and retrieval device. Each of the microprocessors comprises a conventional integrated circuit microprocessor, associated local memory, transmitters and receivers for coupling information to and from the bus and bus access circuitry, cooperating with the arbitrator to allocate the bus resource. Communication input/output is handled by a plurality of microprocessors configured as line processors, each coupled to its associated interface switch, which, in turn, is coupled to modems or other input/output devices. A background or executive microprocessor is included to manage system configuration and react to failures. The common bus actually comprises a pair of buses and modularity is provided by allowing the number of line processors to be changed by inserting or deleting circuit cards without affecting the operation of other line processors.

4002845, Jan 11, 1977

Mar 26, 1975

5/562366

Pradman P. Kaul - Gaithersburg MD
Pradeep Kaul - Rockville MD

Digital Communications Corporation - Gaithersburg MD

H04J 306
H04L 708

179 15BS

A frame synchronizer is disclosed for searching for the framing bits of an N bit frame in a stream of binary signals. Means are provided to compare, bit by bit, the signals in different bit positions of two adjacent frames. When only a single bit position indicates an alternating pattern of binary signals, it is considered the framing bit and a framing pulse is provided in that bit position. Apparatus is also provided to detect loss of synchronization including a pair of counters, one counting framing pulses and the other counting alternating signals in that bit position. To reduce the likelihood of false out-of-synchronization signals, the second of these counters can be pre-set. Only when the count of the first counter exceeds the number of signals counted by the second counter by this pre-set quantity will out-of-synchronization be declared.

5703881, Dec 30, 1997

Mar 9, 1993

8/028502

Stanley E. Kay - Rockville MD
Pradeep Kaul - Darnestown MD
Michael I. Parr - San Diego CA
Graham Avis - San Diego CA
John E. Corrigan - Chevy Chase MD
Daniel Wendling - Darnestown MD
Ashok D. Mehta - North Potomac MD

Hughes Electronics - Los Angeles CA

H04J 317

370468

A multisubscriber unit is disclosed for use of in a digital cellular communication system to communicate with a base transceiver station and eventually to switched telephone network. The multisubscriber unit connects to a plurality of individual subscriber telephones. It includes a plurality of upconverters, modulators, downconverters, demodulators speech compressors, speech decompressors, and voice activity detectors that are assigned to a subscriber telephone upon detection of an off hook signal from the telephone. Preferably, upon the detection of data to be transmitted, to channel allocation is requested from a pool of time division multiple access channels in a digital speech interpolation pool.

4160131, Jul 3, 1979

Oct 7, 1977

5/840451

Pradeep P. Kaul - Rockville MD
Thomas H. Scholl - Rockville MD
Deepak R. Muzundar - Gaithersburg MD
Daniel R. Wendling - Gaithersburg MD
Bob D. Buschman - Gaithersburg MD
Michio Ikawa - Tokyo, JP
Akira Miura - Tokyo, JP
David A. Love - Silver Spring MD

Nippon Electric Company, Ltd. - Tokyo

H04Q 520

179 99M

An electronic key telephone system is disclosed that provides a plurality of telephone features and functions, while only requiring a four-wire line between the central equipment and each key-set telephone (KST) and a two-wire line between the central equipment and each single-line telephone (SLT). Linear delta coding and time division multiplex (TDM) techniques are used to eliminate the multiple pairs required in traditional private business exchange (PBX) systems between the remote key telephones and the control unit. In the present system, a microprocessor controlled TDM controller transmits and receives control signals serially to and from interfaces in the system for control purposes and also for establishing exchange of digitized audio information data between selected interfaces. The system thus exchanges digitized audio information directly between interfaces and provides control signalling between the TDM controller and the interfaces, with all of the exchanges being done in real time. Among other things, the system is compatible with all types of existing central office exchange lines.

5633873, May 27, 1997

Sep 13, 1995

8/528182

Stanley E. Kay - Rockville MD
Pradeep Kaul - Darnestown MD
Michael I. Parr - San Diego CA
Graham Avis - San Diego CA
John E. Corrigan - Chevy Chase MD
Daniel Wendling - Darnestown MD
Ashok D. Mehta - North Potomac MD

Hughes Electronics - Los Angeles CA

H04L 1200

370336

A digital cellular communication system in which fixed subscribers and mobile subscribers share base transceiver stations, base station controllers and mobile switching centers to communicate with the switched telephone network. Mobile subscribers communicate using any cellular radio protocol, while the fixed subscribers communicate via a multi-subscriber unit (MSU) using the inventive air interface. The MSU system uses digital speech interpolation to transmit speech spurts between subscribers and the switched telephone network. Preferably, time division multiple access channels in a digital speech interpolation pool are allocated and deallocated on a speech spurt basis.

3940558, Feb 24, 1976

Jan 31, 1975

5/546052

Ova Gene Gabbard - Germantown MD
Pradeep Kaul - Rockville MD
Joaquin Hangen - Olney MD

Digital Communications Corporation - Gaithersburg MD

H04L 700

178 695R

A clock for locally distributing a synchronized signal derived from a remotely transmitted signal. The clock normally operates in the slave mode, phase locked to the remotely transmitted signal, when that signal is deemed available. If it is not available the clock switches to a master mode in which it independently generates the necessary signal.