Method and system for enabling television commerical monitoring using a marking signal superimposed over an audio signal
US4750053A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 2, 1984 |
| Grant date | Jun 7, 1988 |
| Priority date | — |
| Expiry date | Feb 2, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S358/908
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system and method for detecting and marking television commercials is provided. A first comparator is utilized for comparing the television video signal to an adjustable reference voltage and for generating a triggering signal when a video signal is not present at the comparator input. A second comparator compares the television audio signal to a second adjustable reference voltage to provide a triggering signal when an audio signal is not present at the comparator input. The outputs from the two comparators are supplied to a one-shot timer mechanism which is adapted to generate an output signal of a predetermined time period only upon the simultaneous absence of an audio and video signal, thus signifying a fade break in the television broadcast signal. The timed output signal from the timer mechanism is connected to a low frequency oscillator which generates a low frequency output signal upon being actuated by the output from the timer mechanism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.