Abstract: The present invention describes a multi-module USB system consisting of a multi-function USB apparatus and associated USB cap. The multi-function USB apparatus operates as a USB host as well as a USB client. The USB cap houses a rechargeable battery pack and when docked with the multi-function USB apparatus provides power to the multi-function USB apparatus. The multi-function USB apparatus and USB cap can also operate independently. The USB system is a multi-functional device having modes that embody, including recording, sharing, playback, storage, and charging battery of USB based portable media devices. Further, the USB system configures itself automatically for the various modes based on use of its interfaces with no specific settings required from the user.

Abstract: A recording apparatus for recording audio-visual (A/V) contents directly from an A/V input source to a portable media player (PMP) is disclosed. The recorded A/V contents can be played back by the portable media player immediately upon stopping the recording. The recording apparatus does not involve the use of any intermediate computing or storage device other than the portable media player and the recording apparatus itself. The A/V contents for recording may come in the form of analog/digital signals or as digital data in compressed or uncompressed form from transmission and/or storage devices. Depending upon the nature of the input, the recording apparatus digitizes, encodes and/or transcodes the A/V contents and stores the processed A/V contents directly into the portable media player in playback ready format. The recording apparatus includes a one-button control interface for starting and stopping the recording of A/V contents to the portable media player.

Abstract: A segment of a B picture is encoded using motion estimation based prediction according to a determination as to whether motion vectors corresponding to a number of already constructed reference pictures of the B picture are acceptable for use in a direct prediction mode without further refinement or whether refined motion vectors are needed. In response to a determination that refined motion vectors are needed, refined motion vectors are computed through a motion estimation process and are used to encode a temporal direct mode. The coded segment of the B picture does not include refined motion vectors in an encoded bit stream. Decoding the encoded bit stream involves identifying the mode selected for coding the segment of the B picture. Where the temporal direct mode using refined motion vectors was selected for encoding, local motion estimation refinement is used to generate local motion vectors, which are used to reconstruct the segment of the B picture.

Abstract: A system comprising a media processing apparatus and a computer where the media processing apparatus emulates a mass storage device and interfaces with the computer is disclosed. In one embodiment the media processing apparatus appears to the computer as a Universal serial bus (USB) mass storage device, and the operating system (OS) on the computer, using its pre-installed USB mass storage device driver, establishes bi-directional communication channel with the media processing apparatus. Thus, the need to develop an OS specific kernel-mode device driver for the media processing apparatus is eliminated. The system may employ a proprietary communication protocol on the USB bus to send and receive data between the computer and the media processing apparatus.