Robert E Parish

US Patent:

47696184, Sep 6, 1988

Filed:

May 30, 1986

Appl. No.:

6/869166

Inventors:

Robert M. Parish - Hermosa Beach CA
Albert F. Lawrence - Redondo Beach CA

Assignee:

TRW Inc. - Redondo Beach CA

International Classification:

H03F 316
H03H 1136

US Classification:

330277

Abstract:

A radio-frequency (rf) power combiner or divider structure containing distributed amplifier components and having broadband operating characteristics, and operable with net gain or practically no insertion losses. The divider structure includes an input transmission line having series-connected impedances that interconnect with active devices, such as field-effect transistors to form a practically lossless line. The active devices provide gain between distributed points in the input transmission line and distributed points in multiple output transmission lines, which are similarly structured as series-connected impedances. Each output transmission line supplies one of the divider outputs. In the combiner form of the device, there is a single output transmission line and multiple input transmission lines, coupled to the output line in a distributed manner by active devices.

US Patent:

49639676, Oct 16, 1990

Filed:

Mar 10, 1989

Appl. No.:

7/322396

Inventors:

Steven Orland - Studio City CA
Robert W. Parish - Gaston OR

Assignee:

Tektronix, Inc. - Beaverton OR
National Broadcasting Company, Inc. - Burbank CA

International Classification:

H04N 704
H04N 504

US Classification:

358143

Abstract:

A method for timing audio and video component signals of a television signal with coincidental markers generates a field pulse every Nth field of the televison signal at the transmitter. The duration of the field pulse is approximately one video field, and is ued to enable an audio tone generator for the one video field and to switch a distinctive video signal, such as a flat video signal, into the video component signal for the one video field. At the receiver the two component signals are input through a synchronizer to a waveform display device, such as an oscilloscope, to observe the time differential between the two markers in the audio and video component signals. The audio component signal is delayed by the synchronizer until the markers are again in time conicidence as at the transmitter.