This paper presents the applications of Advanced Encryption Standard (AES) in audio and video signals. Like the ciphertext is completely different from the plaintext in AES operation, so the encrypted audio or visual signal should have the same effect. The experiments reveal the encrypted signals are so much different from the original ones that they become random noises. However, in some cases, a kind of pattern may appear within the encrypted noise in the ECB mode operation, causing a kind of sounds being heard during the play back of encrypted audio noise, or some patterns appeared amid the cipher images, due to having the same audio or video inputs which can be mostly reduced by compressing before encryption. This paper presents the ways, featured in the other four modes of AES, to make the same inputs different without compressing. The high speed parallel operations for the five modes are also discussed.