Video signal processing apparatus
US6665488B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 11, 1999 |
| Grant date | Dec 16, 2003 |
| Priority date | — |
| Expiry date | Nov 11, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/83
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A recording format discriminating apparatus for use on a video tape recorder capable of reproducing a signal recorded on a recording medium in a digital recording format or an analog recording format by one and same head rotary system or a plurality of head rotary systems dedicated to analog recording and digital recording respectively. The apparatus comprises: an amplifier, having a capability of automatically controlling a gain of a signal reproduced by one of the head rotary systems, for amplifying the signal to a predetermined level; a first band extracting circuit for extracting a particular narrow frequency band from the amplified signal; a first comparator and detector for detecting by amplification an output of the first band extracting circuit and comparing the detected output with a first reference value; a second comparator and detector for integrating and holding the comparison result output of the first comparator and detector and then comparing the integrated output with a second reference value; and a recording format discriminating circuit for discriminating the recording format of the signal recorded on the recording medium from the comparison result output of the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.