1
Clifford B Schrock, Linley F Gumm: Bi-directional data transmission and control system. Cablebus Systems Corporation, Chernoff & Vilhauer, August 3, 1982: US04343042 (192 worldwide citation)

A bi-directional data transmission and control system utilizing a central processing unit and a multiplicity of remote subscribers. Each subscriber is provided with a terminal coupled with the central processing unit by a suitable medium such as a CATV channel. Each terminal is provided with a demar ...


2
Thomas C Hill, Xiaofen Chen, Soraya J Matos, Leroy J Willmann, Kyle L Bernard, Linley F Gumm: Calibration for vector network analyzer. Tektronix, Francis I Gray, March 2, 2004: US06701265 (94 worldwide citation)

An improved calibration method for a vector network analyzer stores sparse calibration data, interpolates system error data from the sparse calibration data for each measurement by the vector network analyzer, and creates calibrated measurement data from the system error data and uncorrected measure ...


3
Linley F Gumm: L+R separation system. Tektronix, Francis I Gray, August 18, 1987: US04688253 (93 worldwide citation)

An L+R separation system separates the L+R component of a composite stereo signal, such as a BTSC signal or an FM broadcast stereo signal, from the L-R suppressed subcarrier component by sampling the composite stereo signal at a rate which is twice the frequency of the L-R component subcarrier frequ ...


4
Xiaofen Chen, Linley F Gumm, Dana E Whitlow, Larry R Lockwood: Measurement test set and method for in-service measurements of phase noise. Tektronix, William K Bucher, June 12, 2001: US06246717 (57 worldwide citation)

A system and method for in-service transmitter phase noise measurements determines phase nonlinearity by way of comparing unfiltered signal samples and regenerated reference signal samples to calculate phase nonlinearity error. Linear distortion is removed from the received signal samples in order t ...


5
Linley F Gumm, William Benedict: In-service cable television measurements. Tektronix, Francis I Gray, December 17, 1991: US05073822 (36 worldwide citation)

A cable television measurement system uses a modified spectrum analyzer for determining both carrier-to-noise and triple beat ratios for a cable television (CATV) system. The modified spectrum analyzer is triggered for single sweep during the vertical interval of a selected channel, and the noise am ...


6
Linley F Gumm, Jeffrey D Earls: Instrumentation receiver for digitally modulated radio frequency signals. Tektronix, William K Bucher, Francis I Gray, October 23, 2001: US06307896 (31 worldwide citation)

An instrumentation receiver suitable for receiving a digitally modulated radio frequency input signal having a pilot signal at the RF frequency and symbol data generated at a symbol frequency generates a digitally modulated intermediate frequency signal having the pilot signal at the intermediate fr ...


7
Walter D Fields, Linley F Gumm: Swept frequency domain relectometry enhancement. Tektronix, Francis I Gray, November 26, 1991: US05068614 (27 worldwide citation)

An improved swept frequency domain reflectometry instrument has an input/output terminal coupled to one end of a cable. A radio frequency at the input/output terminal is converted to an intermediate frequency using a swept local frequency. The radio frequency is derived from the swept local frequenc ...


8
Linley F Gumm: Quality cause measurement display. Tektronix, Francis I Gray, November 5, 2002: US06477198 (22 worldwide citation)

A quality cause measurement display is formed by generating an ideal digitally modulated RF transmitter signal. A test instrument is used to measure an overall quality measurement for the transmitter signal as well as individual contributions by each transmitter parameter. Each measured parameter is ...


9
Linley F Gumm, Richard T King: CATV sweep system using a gated receiver. Tektronix, Francis I Gray, August 3, 1993: US05233418 (18 worldwide citation)

A non-interference method of determining the frequency characteristics of a cable television (CATV) system adds an RF test pulse to an RF video signal in the vertical interval between equalizer pulses. A gated receiver coupled to the distribution system receives the RF video signal only during the v ...


10
Linley F Gumm, Steven R Morton: High resolution digital-to-analog converter. Tektronix, George T Noe, October 18, 1983: US04410879 (14 worldwide citation)

An apparatus and method for expanding the resolution of digital-to-analog converters is described. Two limited resolution digital-to-analog converters are cascaded in such a manner that one converts the low order bits of digital input signal and the other converts the higher order bits. The output o ...