Capturing with a Hardware Filter, What it Can Do for You

Channel:
United States Nerdly Pleasures (Great Hierophant)
Subscribers:
982
Published on ● Video Link: https://www.youtube.com/watch?v=KEyPs2hX24c


Wolfenstein 3D
Game:
Wolfenstein 3D (1992)
Duration: 3:14
161 views
0

Even though many devices output RGB, some systems, some consoles are noisier than others. TVs usually have lowpass filters which can reduce noise to a substantial degree. A capture card may or may not have such capabilities.

The Datapath VisionRGB E1s is not such a card, it has no strong filter to reduce or eliminate visual artifacts. It can use a little help. Recently I acquired a little board with a VGA connector on either end. This board passes R, G & B signals through a THS7368 amplifier chip. The THS7368 can apply a sixth-order Butterworth low-pass filter at various cutoff frequencies to reduce or eliminate spurious high-frequency visual artifacts. It has settings for standard definition content (240p/480i), enhanced definition content (VGA/480p), high definition content (800x600 SVGA/720p) and and higher definition content (1024x768, 1080p). The corner frequencies are 9.5-MHz/18-MHz/36-MHz/72-MHz, respectively.

So how does this improve picture quality? I have first decided to show off Wolfenstein 3D without any filtering. Wolfenstein 3D is a good game to use for demonstrating visual noise because it has lots of solid colors and its easy to perceive noise. Then I turn the filter on to the 18MHz setting at 1:39. The second run of the demo has more blocky pixelation than I see through the capture card, which I blame on Youtube's compression algorithm. However, the filter cannot completely work miracles, dark gray is notoriously noisy through the Datapath.

Wolfenstein 3D is being run on a 486 DX2/66 and the VGA card should be some generic ISA card. The sound is being generated by a YMF-719 sound card, so that OPL3 is genuine. I upscaled 640x400 to 1920x1600 for a more appropriate aspect ratio, even though the result is a little too skinny.

With a little extra hardware, I will be happy to show you what this filter board can do on some 240p content. Stay tuned!



Other Videos By Nerdly Pleasures (Great Hierophant)


2020-02-04Demonstration - Analogue Mega Sg with 32x and Analogue DAC
2020-01-30Creepy Brawlers NES Homebrew Cartridge Simulated MMC3 vs. Nt Mini Simulated MMC3
2020-01-11Silly Legend of Zelda ゼルダの伝説 THE HYRULE FANTASY Microphone Hack
2019-12-27Three Views of Below the Root for the IBM PC Platform
2019-12-26The Three Faces of Bruce Lee on the IBM PC Platform
2019-12-18Ultima VII Speed Limiting Solutions Compared
2019-12-12Gimmick! ギミック! Original Sunsoft 5B Full Soundtrack AV Famicom Hardware Recording
2019-12-08Rolling Thunder ローリングサンダ Famicom Namco 163 Expansion Audio Orig. Hardware Partial Soundtrack
2019-12-05悪魔城伝説 (Akumajou Densetsu / Castlevania 3 J) Famicom HVC-CPU-07 Original Hardware Full Soundtrack
2019-12-03Playthrough - The Secret of Monkey Island PC 16-Color Version Tandy/Adlib Real Hardware 60fps
2019-08-26Capturing with a Hardware Filter, What it Can Do for You
2019-08-17Demonstration - Planet X3 with the IBM PC/XT
2019-07-11Playthrough - Adventure in Serenia IBM PC/XT w/Composite CGA
2019-06-22Demonstration - Ultima III and IV on the IBM PC/XT with CGA
2019-06-11Mega Sg Running Coleco Homebrew
2019-06-09CGA Compatibility Test Suite - RGBI Capture
2019-05-30VGA Capture - "Copper" Demo by Surprise!
2019-05-28Micro Machines NES - Every Pixel as Intended
2019-05-27Demonstration - AtariVox Speech Synthesis with the Analogue Nt Mini 2600 Core
2019-05-11IBM PC/XT RGBI CGA 160x100 with Borders Capture
2019-05-11IBM PC/XT Monochrome & Hercules Graphics Capture


Other Statistics

Wolfenstein 3D Statistics For Nerdly Pleasures (Great Hierophant)

Currently, Nerdly Pleasures (Great Hierophant) has 161 views for Wolfenstein 3D across 1 video. Less than an hour worth of Wolfenstein 3D videos were uploaded to his channel, making up less than 0.11% of the total overall content on Nerdly Pleasures (Great Hierophant)'s YouTube channel.