Claims
- 1. An adaptive vertical low pass flicker filter for use within a television signal scan conversion process, the flicker filter comprising an input for receiving an unfiltered video data stream, an output for putting out an adaptively low pass filtered, flicker-reduced video data stream, and combining circuit means located in a main path between the input and the output, the filter further comprising vertical high pass filter means connected to the input for passing vertical high frequency energy components and threshold means connected to receive the passed vertical high frequency energy components and pass them above a predetermined threshold set above picture noise level, the threshold-passed high frequency energy components being subtracted in proper time and phase at the combining circuit means from the video data stream passing through the main path.
- 2. The adaptive vertical low pass flicker filter set forth in claim 1 wherein the predetermined threshold established at the threshold means is approximately 20 IRE units.
Parent Case Info
This is a division of application Ser. No. 07/466,469, filed Jan. 17, 1990.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4825289 |
Ohta |
Apr 1989 |
|
4926261 |
Matsumoto et al. |
May 1990 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
466469 |
Jan 1990 |
|