灰度调制型（brightness mode），即 超声，以波幅变化反映回波情况。灰度调制型（brightness mode），即 B型超声，系以明暗不同的光点反映回声变化，在影屏上显...
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根据FED显示器响应特性，设计了改进型pwm灰度调制方法。
Base on the response characteristics of FED, the improved grayscale pulse width modulation (PWM) method was designed.
采用FPGA控制技术实现了改进型pwm灰度调制，减少了FED图像灰阶损失，提高了图像显示质量。
The FPGA technology was used to achieve an improved control of grayscale PWM modulation. It can reduce the loss of FED grayscale images and improve image display quality.
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