Prints out image and sound information.
输出画面与声音信息。
Digital watermarking is the technology that embeds secret information into digital multimedia data such as sound, image or video by using signal processing technology.
数字水印技术是用信号处理的方法在声音，图像或视频等数字化多媒体数据中嵌入隐蔽信息的行为。
These information media consist of character, figure, image, sound, video frequency, etc. But it is impossible to attain by traditional teaching mode.
将文字、图形、图像、声音、视频等各种信息进行组合，可以实现传统的教学方式无法达到的效果。
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