Google also wanted to leverage the same collaborative filtering technology to be able to recommend images, videos, and music, for which it's more difficult to analyze the underlying content.
Google希望能够通过调节这个复合筛选技术来解决内容分析方法难以解决的图片，video，还有音乐方面的推荐。
Beside filtering interference signals and extract effective signals, it is a difficult problem to study the separation of multi-signal of sound wave and vibration.
在实际测量过程中，除了过滤干扰信号，提取有效信号外，多振动源信号分离是本文研究的一个难点。
Compared with common audio signal processing attacks such as MP3 compression, low-pass filtering etc., they are more difficult to manage.
与mp3音频压缩、低通滤波等常规的音频信号处理攻击相比，同步攻击更加难以抵抗，已经成为研究界的一个公开难题。
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