Synchronizing signal detecting apparatus
US6151374A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 1997 |
| Grant date | Nov 21, 2000 |
| Priority date | — |
| Expiry date | Mar 3, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H2201/20
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
When an edge detecting unit detects a falling edge of a digital audio broadcasting (DAB) signal, a time instant of a timer, which has a periodic characteristic, is stored via a calculating unit into a memory. If there is one piece of data continued a number of times, when an output value of a timer becomes a value of this data offset by a frame time period, the calculating unit resets the timer. Subsequently, when the value of the timer becomes equal to the period length T, the calculating unit resets the timer and at the same time, outputs an L level to an output terminal only during a preselected time period after the timer is set to 0. Accordingly, even when another signal is mixed into a frame synchronizing signal of a DAB signal, the synchronizing signal timing is detected without increasing the time required to detect a frame header.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.