1
Philip F Kromer III, Rangarajan Srinivasagopalan, Raul F Fernandez: Carrier-phase adjustment using absolute phase detector. Racal Data Communications, William A Newton, July 15, 1986: US04601044 (61 worldwide citation)

Disclosed is a modulation-demodulation system and method for transmitting a plurality of sequentially received information bit sequences, the system including a transmitter having a state machine for expanding by a coding process each information bit sequence into an expanded bit sequence with a cod ...


2
Ran F Chiu, Philip F Kromer III, Ming L Kao, Henry H Parrish: Hybrid automatic gain control circuit. Racal Milgo, Jackson Jones & Price, July 15, 1980: US04213097 (35 worldwide citation)

An automatic gain control circuit having a coarse analog gain adjustment section producing discrete increments of db gain and a fine digital gain adjustment section. The digital section provides for adjustment of gain through a final increment of db gain to achieve precise gain setting. The output o ...


3
Philip F Kromer III: Microprocessor architecture employing efficient operand and instruction addressing. Racal Milgo, Jackson & Jones, September 10, 1985: US04541045 (28 worldwide citation)

A two-bus, two instruction type, pipelined microprocessor having a control means which orders application of instruction and data addresses to a memory and further interleaves instructions and data on a single bus to achieve maximum efficiency in operation.


4
Philip F Kromer III, Ran F Chiu, Ming L Kao, Henry H Parrish: Data modem false equilibrium circuit. Racal Milgo, Jackson Jones & Price, October 19, 1982: US04355402 (13 worldwide citation)

Circuitry for detecting and correcting false equilibrium conditions generated in data modems by sudden changes in gain of an associated transmission system including a false gain detector which detects a low rate of production of symbols of largest magnitude and triggers a final gain circuit which i ...


5
Ran F Chiu, Philip F Kromer III, Ming L Kao, Henry H Parrish: Fast learn digital adaptive equalizer. Racal Data Communications, Jackson & Jones, September 3, 1985: US04539689 (13 worldwide citation)

An automatic adaptive equalizer operative on a test pattern including a carrier-only period, clock-only period and a single test impulse. The equalizer employs a transversal filter under control of a microprocessor. Samples of in-phase and quadrature phase components of the received impulse response ...


6
Philip F Kromer III: Data modem clock extraction circuit. Racal Data Communications, Jackson Jones & Price, June 19, 1984: US04455665 (8 worldwide citation)

A digital timing recovery circuit operative upon digital samples of the input signal to a data receiver provided at the sample rate to produce a clock correction signal at the symbol rate utilizing a digital periodic filter providing a double restrictive bandpass characteristic about the band edge f ...


7
Ran F Chiu, Henry H Parrish, Philip F Kromer III, Ming L Kao: Sampling clock correction circuit. Racal Milgo, Jackson Jones & Price, April 21, 1981: US04263671 (4 worldwide citation)

A circuit for maintaining proper sampling timing in a data modem wherein main channel equalizer error is correlated with a derivative channel signal to drive a clock correction signal. The derivative channel signal is derived from an equalizer using fewer coefficients than required to derive the mai ...


8
Oscar C de Leon Jr, Philip F Kromer III: Noninterruptive noise measurement. Racal Data Communications, Jerry A Miller, April 14, 1987: US04658210 (2 worldwide citation)

A noninterruptive noise measurement technique wherein the absolute value of the amplitude error from a modem slicer is compared to a reference, the number of events in excess of said reference over a selected interval are counted and the range within which said count falls is determined as a particu ...