Abstract: Variable gain commutating amplifier apparatus and methods for use in a polar modulator are described. The apparatus may include two or more commutating amplifier stages configured to be switched to an output load based on a desired amplitude and/or transmit power level. The amplifier stages may include cross-coupled differential pairs to cancel RF carrier feedthrough. An additional R-2R ladder circuit may be provided to further extend the dynamic range by reducing the output power at the lowest output stages.

Abstract: Variable gain commutating amplifier apparatus and methods for use in a polar modulator are described. The apparatus may include two or more commutating amplifier stages configured to be switched to an output load based on a desired amplitude and/or transmit power level. The amplifier stages may include cross-coupled differential pairs to cancel RF carrier feedthrough. An additional R-2R ladder circuit may be provided to further extend the dynamic range by reducing the output power at the lowest output stages.

Abstract: An apparatus, system, and method are directed towards parsing and selectively encrypting different portions of data in real-time, decrypting the encrypted data in real-time, and passing the data to a media player on a client computer or other network capable device. Data in a network packet may be parsed into payload and non-payload portions. The payload portion of the packet data may then be examined to determine whether a predefined type of the data is recognized. For example, in one embodiment, the predefined data type may be media content. If the payload portion is recognized as a predefined data type, then it may be selectively encrypted. The selectively encrypted payload portion and non-payload portion of the packet may then be combined, such that the non-payload portion may be employed by firewalls, proxies, and/or NATs to route the packet towards the client computer or other network capable device.

Abstract: An apparatus and method for selectively encrypting portions of data sent over a network between a server and a client. The apparatus includes parsing means for separating a first portion of the data from a second portion of the data, encrypting means for encrypting only of the first portion of the data, and combining means for combining the encrypted first portion of the data with the second portion of the data, wherein the second portion of the data is not encrypted. The apparatus further includes decrypting means installed at the client for decrypting the encrypted portion of the data. The apparatus is platform independent in terms of media format and data protocol. The encryption unit encrypts data transparently to the client based on the media format. The apparatus of the invention is implemented as one of an application and a plug-in object.

Abstract: A method and apparatus applies a variety of session based watermarks in real-time to content that is streamed from a server towards a client. The invention employs content where differing targeted portions are selectively encrypted, such that other portions remain in the clear (unencrypted). Session information, such as an intended client, end-user, operator of a content server, content owner, and the like, may be used to generate the various watermarks. The watermarks may also be digitally signed and/or encrypted. The watermarks may be applied to the portions of the clear content as the content is streamed towards the client. In one embodiment, a bridge server is configured to modify packets of streaming media data files with the variety of watermarks. In another embodiment, the content server for the streaming media data includes a plug-in component that dynamically modifies the packets of streaming media data files with the variety of watermarks.

Abstract: In one embodiment, the present invention includes a differential traveling wave amplifier having a lumped differential preamplifier stage and a distributed differential amplifier stage coupled by a differential end termination interface. In certain embodiments, the distributed differential amplifier stage may include transverse electromagnetic transmission lines coupled between its input and output.

Abstract: Provided are pulse imaging sequences and methods for 2D mulfi-slice T1p-weighted and 3D T1p-weighted magnetic resonance imaging (MRI). Further provided is a self-compensating spin-locking sequence for correcting and reducing artifacts in T1p-weighted imaging. Also provided is a sequence combining 3D T1p-weighted MRI with a self-compensating spin-locking pulse for facilitating T1p-weighted imaging with surface coils.