Abstract: The present disclosure provides a rear shell of a display device, including a rear shell body. The rear shell body includes an accommodation cavity for accommodating a loudspeaker, the accommodation cavity has a first opening, the rear shell body further includes a cover plate for blocking the first opening, and the cover plate is provided with a sound outlet hole. The present disclosure further provides the display device. The loudspeaker is accommodated in the accommodation cavity of the rear shell rather than the whole machine, so as to prevent the occurrence of resonance.

Abstract: Described are an encoding method and system for ROAs. The encoding method includes the following steps: given a set of authorized IP prefixes an AS which are maintained with an IP address trie. By specifying a sequence of hanging levels on the IP address trie, it is divided into a set of non-overlapping sub-trees, each rooted at a hanging level. A node on a hanging level uniquely defines a sub-tree rooted at it, whose prefix can be encoded as the identifier of this sub-tree. All authorized prefixes covered by a sub-tree can be encoded into a bitmap of 2h bits, where h is the height of this sub-tree. Thus, the set of authorized IP prefixes of an AS is encoded into several tuples (identifier, bitmap).

Abstract: The present disclosure provides a rear shell of a display device, including a rear shell body. The rear shell body includes an accommodation cavity for accommodating a loudspeaker, the accommodation cavity has a first opening, the rear shell body further includes a cover plate for blocking the first opening, and the cover plate is provided with a sound outlet hole. The present disclosure further provides the display device. The loudspeaker is accommodated in the accommodation cavity of the rear shell rather than the whole machine, so as to prevent the occurrence of resonance.