Patent US 4135201A
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| Patent number | US 4135201A (click link for details and documents via Google Patents) |
|---|---|
| Title | Dynamic damping for SECAM high-frequency de-emphasis |
| Inventors | Doug Dickie, Larry Nelson |
| Company | Tektronix Inc |
| Filing date | 1977-03-09 |
| Grant date | 1979-01-16 |
Documents referencing Patent US 4135201A:
| Document | Title | Authors | Year | Links |
|---|---|---|---|---|
| Technology Report October 1979.pdf | Patent Received: 4,135,201 Dynamic Damping for SECAM High-Frequency De-Emphasis | Doug Dickie | 1979 | Patent US 4135201A |
A switching element is placed across a filter and controllably activated to dynamically change the response of the filter. Specifically, additional damping is switched into the "Bell" characteristic, interjected during blanking and removed after the beginning of white lead-in, to dynamically change the response of the band-pass "Bell" filter in a Sequential Color and Memory Television System.