Method and apparatus for providing a visual indication of a relationship between two signals
US4648113A · kind A · utility
20Cited by
18References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1985 |
| Grant date | Mar 3, 1987 |
| Priority date | — |
| Expiry date | Sep 11, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S7/40
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A visual indication of the relationship between first and second electrical signals, such as the left and right channel signals in a stereophonic audio system, is provided through use of a video vectorscope. The first and second signals are used to modulate the amplitude of two sinusoidal waves at a subcarrier frequency and in phase quadrature, so as to synthesize the chrominance portion of a composite video signal. The two modulated sine waves are additively combined, and the resulting signal is applied to the input terminal of the vectorscope.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.