Cathode ray tube meters
US3965419A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 18, 1974 |
| Grant date | Jun 22, 1976 |
| Priority date | — |
| Expiry date | Jul 18, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A cathode ray tube meter, which may be developed as a VU meter, provides visual representation of the signal levels in each channel of plural signal channels. The signal channels may be the signal channels in a multi-channel audio system. The amplitude of a sawtooth waveform signal from a sawtooth waveform signal generator, which also controls the vertical sweep of an oscilloscope, is compared sequentially with individual d.c. signals developed by respective peak detectors, one being associated with each signal channel, to provide a control signal whenever the amplitude of the sawtooth waveform signal exceed the level of that particular one of the d.c. signals with which it is being compared at any given time. The control signal thus produced is used either as a blanking signal for the vertical sweep or as a signal for effecting the resetting of the sawtooth wave generator. A second sweep signal having a plurality of discrete levels controls the horizontal sweep of the oscilloscope. The horizontal sweep is synchronized so that each vertical trace appearing on the screen of the oscilloscope relates to an individual one of the signal channels, its length corresponding to the amplitud…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.