Single clock 27 MHZ oscillator in MPEG-2 system
US6151479A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 3, 1997 |
| Grant date | Nov 21, 2000 |
| Priority date | — |
| Expiry date | Jun 3, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H40/90
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
This invention provides a method of generating multiple frequencies for use in a digital data transmission system including a remote transmitter and receiver. The reference frequency used in the transmitter is replicated in a remote receiver. A single crystal oscillator is used to generate a reference frequency similar to that used in the transmitter. The receiver reference frequency is manipulated by dividing the frequency into required multiple frequencies for use within the receiver. A constant comparison is made between the clock signal received in the transmitted data stream with the receiver reference frequency and the divisors are adjusted accordingly to maintain the clock frequency in the receiver within a predetermined tolerance range. This allows the output signal for display from the receiver to match the quality of the input display provided to the transmitter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.