Noise canceler for keying pulse in CATV converter
US5199048A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 27, 1991 |
| Grant date | Mar 30, 1993 |
| Priority date | — |
| Expiry date | Mar 27, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/1027
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A noise canceler for use in a CATV converter includes a keying pulse processing circuit for removing a noise signal from a keying signal. The keying pulse processing circuit includes a canceling signal generator for generating a noise canceling pulse signal, a delaying circuit for delaying the keying signal to produce a delayed signal, and a logic circuit including an AND gate for producing a noise canceled signal which is obtained by taking a logical product of the canceling pulse signal and the delayed signal. Since the noise pulse has a sufficiently small width when compared with the pulse widths of the keying signal and noise removing signal, the noise pulse is removed to obtain a noise canceled signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.