End-of-utterance detection
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，详情可参考safew官方版本下载
At 60 frames per second with a 15.7kHz horizontal rate, you get about 262 lines per frame. Subtract the vertical blanking interval and you’re left with roughly 240 visible lines, which is why classic arcade games run at 320x240 or similar resolutions.
Note how the black A is totally invisible on the black terminal, while the white H looks the same as normal text. If we chose a different color-scheme for our terminal, it would be the opposite: