1
Ahmad K Aman, Robert L Cupo, Nicholas A Zervos: Technique for achieving the full coding gain of encoded digital signals. AT & T Bell Laboratories, David R Padnes, March 10, 1992: US05095497 (87 worldwide citation)

In a telephone local loop transmission arrangement, data is communicated from the customer premises to the central office utilizing a multi-dimensional, passband signal illustratively at 480 kb/s. Specifically, the transmitted signal is encoded in a trellis code and precoded using a generalized part ...


2
Robert L Cupo, Cecil W Farrow: Equalizer-based timing recovery. American Telephone and Telegraph Company, AT&T Information Systems, Ronald D Slusky, March 21, 1989: US04815103 (64 worldwide citation)

In a data receiver employing a fractionally spaced equalizer, the phase with which samples of the received signal are formed is controlled in response to a signal indicative of the center of gravity of the equalizer coefficient.


3
Robert L Cupo: Equalization arrangement. American Telephone and Telegraph Company, AT&T Information Systems, Ronald D Slusky, January 24, 1989: US04800573 (58 worldwide citation)

A voiceband data signal comprised of frequency-division-multiplexed primary and secondary channels is applied to the receiver portion of a modem. Circuitry within the modem for recovering the primary channel data includes an anti-aliasing filter, A/D converter, Hilbert filter, demodulator, fractiona ...


4
Ahmad K Aman, Robert L Cupo, Nicholas A Zervos: Technique for achieving the full coding gain of encoded digital signals. AT&T Bell Laboratories, David R Padnes, November 10, 1992: US05162812 (58 worldwide citation)

In a telephone local loop transmission arrangement, data is communicated from the customer premises to the central office utilizing a multidimensional, passband signal illustratively at 480 kb/s. Specifically, the transmitted signal is encoded in a trellis code and precoded using a generalized parti ...


5
Robert L Cupo: Phase jitter compensation arrangement using an adaptive IIR filter. American Telephone and Telegraph Company, AT&T Information Systems, Frederick B Luludis, July 11, 1989: US04847864 (49 worldwide citation)

A voice-band data symbol is typically impaired by so-called phase jitter prior to symbol being received at a data modem. Modem circuitry estimates the phase angle of the jitter and an infinite-impulse-response (IIR) filter adjusts to that phase angle so that the jitter can be corrected for by a demo ...


6
Robert L Cupo: Sampling system for radio frequency receiver. Paradyne Corporation, Thomas Kayden Horstemeyer & Risley L, November 24, 1998: US05841814 (37 worldwide citation)

A radio frequency (rf) receiver adapted to receive a number of different digitally modulated rf input signals such as quadrature amplitude modulated (QAM) and vestigial side band (VSB) rf input signals includes circuitry for down converting the rf input signals to an intermediate frequency (IF) rang ...


7
Robert L Cupo, Cecil W Farrow: Equalizer-based timing recovery. AT&T Bell Laboratories, David R Padnes, October 4, 1994: US05353312 (25 worldwide citation)

Timing recovery circuitry for recovering digital data generates a timing signal which is a function of the delay provided by an equalizer to one or more predetermined frequency components of its input signal. Advantageously, this approach is applicable to systems which utilize one or more baseband o ...


8
Robert L Cupo, Cecil W Farrow: Digital signal processor architecture. American Telephone and Telegraph Company, AT&T Information Systems, Frederick B Luludis, June 27, 1989: US04843581 (23 worldwide citation)

The computational processing power of a Digital Signal Processor (DSP) in linear-phase Finite Impulse Response Filter (FIR) applications is essentially doubled by taking advantage of either the even (symmetrical) or odd (antisymmetrical) symmetry of the response of such a filter.


9
Robert L Cupo: Phase jitter correction arrangement. AT&T Bell Laboratories, David R Padnes, May 19, 1992: US05115452 (15 worldwide citation)

In a communications system, a transmitted signal is typically impaired by phase jitter attributed to power line harmonics and ringing voltages present in a communications channel. In order to properly recover the transmitted signal, the phase jitter in a received signal needs to be eliminated. To th ...


10
Robert L Cupo, Cecil W Farrow: Synchronizing the operation of multiple equilizers in a digital communications system. AT&T Bell Laboratories, David R Padnes, November 10, 1992: US05163066 (12 worldwide citation)

In a dual-duplex system wherein the communications channels have associated propagation delays which are typically different from one another, equalizers are connected to operate upon the signal received from each channel. To synchronize the operation of these equalizers to each other, the coefficie ...