Touch controlled zoom of waveform displays
US4755811A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1987 |
| Grant date | Jul 5, 1988 |
| Priority date | — |
| Expiry date | Mar 24, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/033
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Touch controlled zoom of a waveform display uses a touch screen for the display surface. Function buttons for moving or expanding the waveform display and for determining the axis of such movement or expansion operate in conjunction with a rotary encoder. Expansion, or zoom, is accomplished by contacting the screen overlying a point on the waveform about which zoom is desired. Such contact or activation of the expand function button results in movement of the rotary encoder providing a gain parameter to a zoom function. The zoom function operates on the waveform display in an exponential manner as a function of the gain parameter to expand or contract the waveform display about the zoom point according to the direction of rotation of the rotary encoder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.