Peter C Song

US Patent:

20040247142, Dec 9, 2004

Filed:

Jun 4, 2004

Appl. No.:

10/861209

Inventors:

Ravi Sawhney - Calabasas CA, US
Ingvald Smith-Kielland - Santa Monica CA, US
Paul Janowski - Ventura CA, US
Peter Song - Los Angeles CA, US

International Classification:

H03F021/00

US Classification:

381/120000

Abstract:

An amplifier for musical instruments containing a means for playing recorded music, such as a cd player, can be used to enhance the learning of musical selections by enabling the musician to play, repeat, and isolate and repeat phrases of the musical selections.

US Patent:

20230028558, Jan 26, 2023

Filed:

Jul 23, 2021

Appl. No.:

17/351289

Inventors:

- Waltham MA, US
Wesley S. Pan - El Segundo CA, US
Peter Song - Del Mar CA, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

H01Q 3/38
H04L 27/36
H03H 7/18

Abstract:

A passive vector modulator (PVM) includes a divider that splits an input signal into a first divided signal and a second divided signal 90 apart in phase. The PVM includes a switched transformer phase shifter including primary windings to form first primary windings and second primary windings receiving the first divided signal and the second divided signal respectively. First secondary windings are coupled to the first primary windings, the first secondary windings being center-tapped and outputting first and second phase shifted output signals, phase shifted 180 and 0 respectively. Second secondary windings are coupled to the second primary windings, the second secondary windings being center-tapped and outputting third and fourth phase shifted signals, phase shifted 270 and 90 respectively. The PVM includes a switch configured to receive the phase shifted output signals. The switch selectively outputs one of the phase shifted output signals, or a combination, from the PVM.