1
William L Betts, Edward S Zuranski: Secondary channel for digital modems using spread spectrum subliminal induced modulation. Paradyne Corporation, Kane Dalsimer Sullivan Kurcz Levy Eisele and Richard, March 7, 1989: US04811357 (132 worldwide citation)

A system and method are provided for use of a secondary channel in high speed (greater than 2400 bits per second) wire line modems to provide low speed (around 110 bits per second) non-interfering communications for control or monitoring functions. The secondary channel is used to monitor, configure ...


2
Gordon Bremer, William L Betts: Method and system for a synchronized pseudo-random privacy modem. AT&T Paradyne, Kane Dalsimer Sullivan Kurucz Levy Eisele & Richard, May 8, 1990: US04924516 (75 worldwide citation)

A method and system for a synchronized pseudorandom privacy modem makes use of a pseudorandom signal generator to index into a table of N signal spaces thereby altering gain and phase modifiers so or to modify both the gain and phase of portions of the data signal being transmitted from a QAM modem ...


3
William L Betts, Kenneth Martinez, Gordon Bremer: Distributed trellis encoder. Paradyne Corporation, Kane Dalsimer Sullivan Kurucz, June 30, 1987: US04677625 (67 worldwide citation)

In the transmitter of a data communication system using QAM, a plurality of trellis coders with delay units are used for forward error correction. The output of each encoder is modulated using QAM to generate sequential baud signal elements. The redundant data bits generated are distributed between ...


4
William L Betts, James J DesRosiers: Adaptive transmit pre-emphasis for digital modem computed from noise spectrum. A T & T Paradyne, Kane Dalsimer Sullivan Kurucz Levy Eisele & Richard, April 16, 1991: US05008903 (56 worldwide citation)

An apparatus and method calculates pre-emphasis coefficients for a transmitting modem based upon the noise spectrum as it is received at the receiving modem. A noise spectrum analysis circuit calculates a difference between the best-fit transmitted data and the actually received data. This differenc ...


5
Gordon Bremer, William L Betts, Robert T Greene: Modem in-band secondary channel via radial modulation. Paradyne Corporation, Kane Dalsimer Kane Sullivan & Kurucz, June 25, 1985: US04525846 (52 worldwide citation)

A transmission system for transmitting a first data series, and a second data series from a first modem to a second modem using QAM or PSK type modulation techniques. The first data series is sent using standard QAM techniques such as an 8-point scheme, wherein each point has a radial component. The ...


6
William L Betts, Carol Betts: Sensory enhancement systems and methods in personal electronic devices. Innovation Specialists, Thomas Kayden Horstemeyer & Risley, January 18, 2011: US07872574 (51 worldwide citation)

Disclosed are personal electronic devices (PEDs) having a sensory enhancement (SE) system for monitoring environmental conditions and detecting environmental events, for example but not limited to, changes in acoustic, thermal, optical, electromagnetic, chemical, dynamic, wireless, atmospheric, or b ...


7
William L Betts: Modulus converter for fractional rate encoding. AT&T Bell Laboratories, Kane Dalsimer Sullivan Kurucz Levy Eisele & Richard, April 7, 1992: US05103227 (41 worldwide citation)

Fractional rate modulation conversion is accomplished by separating incoming data into frames of bits. Each frame is partitioned into bit words of unequal bit lengths. The words are divided by a modulus to obtain remainders. The remainders are then multiplexed into sequential bauds of common modulus ...


8
William L Betts, Kenneth Martinez: Self-synchronizing interleaver for trellis encoder used in wireline modems. Paradyne Corporation, Kane Dalsimer Sullivan Kurucz, June 30, 1987: US04677626 (38 worldwide citation)

In the transmitter of a data communication system using QAM, a trellis coder with k-baud delay units is used for forward error correction. The output of the encoder is modulated using QAM to generate sequential baud signal elements. The redundant data bits generated are distributed among several non ...


9
William L Betts, Edward S Zuranski: Signal point interleaving technique. AT&T Bell Laboratories, Ronald D Slusky, Gerard A deBlasi, September 7, 1993: US05243627 (35 worldwide citation)

Viterbi decoder performance in a data communication system using 2N-dimensional channel symbols N>1 can be further enhanced by an interleaving technique which uses a distributed trellis encoder in combination with a signal point interleaver.


10
William L Betts, Edward S Zuranski: Method and apparatus for adaptively providing precoding and preemphasis conditioning to signal data for transfer over a communication channel. AT&T, Christopher N Malvone, March 7, 1995: US05396519 (34 worldwide citation)

The relative amounts of additive white noise and proportional noise in a communication channel are compensated for by providing adaptive precoding and preemphasis to signal point signals. The amounts of precoding and preemphasis are controlled using scalars to modify the magnitudes of the precoding ...