Silicon Image Gmbh

Lattice Semiconductor Corporation

William Conrad Altmann

Gyudong Kim

Russel A Martin

Hoon Choi

James D Lyle

Min-Kyu Kim

Paul Daniel Wolf

Ken-Sue Tan

Embodiments relate to sending vertical synchronization data for a plurality of data streams in a selected data stream to perform authentication operations for the plurality of data stream. A port processor receives data streams from a plurality of transmitting devices. After receiving the data streams, the port processor selects one of the data streams for transmission to a decrypting device. The port processor extracts vertical synchronization data from the unselected data streams and inserts the extracted vertical synchronization data into the selected data stream to form a modified data stream. The port processor sends the modified data stream to a decrypting device. The decrypting device has at least one processing engine. The port processor discards the unselected data streams without sending the unselected data streams to the decrypting device.

Port processor capable of performing authentication for multiple source devices

Embodiments of the invention are generally directed to partial encryption of data stream. An embodiment of a method includes receiving, at a data transmitting device, a data stream having content including one or more of audio content, video content, and control content, determining one or more content that are to be encrypted. The method further includes partially encrypting the data stream by encrypting the one or more content, and leaving other content unencrypted, and transmitting, from the data transmitting device, the partially encrypted data stream to a data receiving device.

Mechanism for partial encryption of data streams

A cable with circuitry that enables the cable to communicate data in one of at least two different signal modes of operation is presented. In a first signal mode, the cable enables data communication between the circuitry and either a source device or a sink device. The first signal mode can be used either to communicate properties of the cable itself or of a signal passing through the cable to either the source device or the sink device. In a second signal mode, the cable enables data communication between the source device and the sink device. The second signal mode can be used to communicate data in accordance with a predetermined protocol.

Cable with circuitry for communicating performance information

Embodiments of the invention are generally directed to combining multiple video and audio streams utilizing pixel repetition bandwidth. An embodiment of an apparatus includes a buffer to receive pixel data and a clock of a first video data stream; and a multiplexer to remove pixel repetition of a second video data stream and combine the pixel data of the first and second video data streams to generate a merged data stream, the multiplexer to alternate between the pixel data of the first and second video data streams in the merged data stream. The merged data stream includes pixel data of the first and second video data streams in a line of data, the line of data including control information identifying the pixel data of the first and second video data streams.

Combining video and audio streams utilizing pixel repetition bandwidth

Embodiments of the invention are generally directed to messaging to provide data link integrity. An embodiment of a method includes transmitting a data stream over a data link from a first device to a second device, the data stream including multiple frames, the data stream being transmitted in a first mode. The method further includes determining a data transmission mode change from the first mode to a second mode for the transmission of the data stream from the first device to the second device, generating mode packets, each mode packet including fields to define a plurality of mode elements, the fields of the mode packet being set to indicate the data transmission mode change, and transmitting the mode packets to the second device prior to implementing the data transmission mode change.

Messaging to provide data link integrity

Embodiments of the invention are generally directed to identification and handling of data streams using coded preambles. An embodiment of an apparatus includes an interface with a communication channel, transmitter coupled with the interface to transmit one or more data streams via the interface, and a processing element, the processing element to receive one or more data streams for transmission. Upon receiving multiple data streams for transmission of a first type of data, including a first data stream and a second data stream for transmission of the first type of data, the processing element is to select a first preamble for the first data stream and a second preamble for the second data stream, where the first preamble is distinguishable from the second preamble.

Identification and handling of data streams using coded preambles

Embodiments of the invention are generally directed to performing processing of content through partial authentication of secondary channel. An embodiment of a method includes performing a first authentication between a source transmitting device and a sink receiving device for communication of data streams, and performing a second authentication between the source transmitting device and a bridge device such that the second authentication is independent of the first authentication and the sink receiving device remains uninfluenced by the second authentication. The bridge device includes an intermediate carrier device coupled to the source transmitting device and the sink receiving device. The method further includes transmitting a data stream having encrypted content from the source transmitting device to the bridge device.

Mechanism for internal processing of content through partial authentication on secondary channel

Embodiments of the invention are generally directed detection of encryption utilizing error detection for received data. An embodiment of a method includes selecting a first port for foreground processing of a stream of data received at the first port, the stream of data including content data, and sampling a set of data received at a second port, the second port being not selected for foreground processing, the set of data including a data packet and error correction data. The method further includes performing background processing of the set of data, wherein the background processing includes decrypting data of the data packet and utilizing the error correction data to determine whether the data packet contains an error, and determining whether data received at the second port is encrypted based at least in part on the determination whether the data packet contains an error.

Detection of encryption utilizing error detection for received data

Embodiments of the invention are generally directed to video frame synchronization. An embodiment of a method includes receiving a first video data stream from a first source at a first port of a multi-port device, a first video frame of the first video data stream arriving at the first port at a first arrival time, and receiving a second video data stream from a second source at a second port of the multi-port device, a second video frame of the second video data stream arriving at the second port at a second arrival time. The method further includes determining an offset between the first arrival time and the second arrival time, determining one or more correction factors based at least in part on the offset, the one or more correction factors including a first correction factor for the first source, and sending a first command to the first source to modify a time of transmission by the first source of a third video frame following the first frame using the correction factor.

Video frame synchronization

Embodiments of the invention are generally directed to signaling for transitions between modes of data transmission. A embodiment of a method includes transmitting a data stream over a data link from a first device to a second device, the data stream operating in a first mode; determining that the data stream is to be changed from the first mode to a second mode; and transmitting a message from the first device to the receiver over a control link, the message indicating that the first device will change the data stream from the first mode to the second mode, the message being sent prior to the change to the second mode.

Signaling for transitions between modes of data transmission

A communication system including a transmitter, a receiver, and a TMDS-like link, in which video data and auxiliary data (typically including timing data associated with other auxiliary data) are transmitted from the transmitter to the receiver, or in which video data are transmitted over the link from the transmitter to the receiver, and auxiliary data (typically including timing data associated with other auxiliary data) are transmitted from the receiver to the transmitter. In typical embodiments the auxiliary data include one or more streams of audio data. Other aspects are transmitters and receivers for use in such a system, methods for sending auxiliary data and video data over a TMDS-like link, methods for transmitting and recovering clocks for auxiliary data transmitted over such a link, methods for synchronizing auxiliary data transmitted over such a link with video data transmitted over such a link, and methods for generating clocks having frequency closely matching the rate at which the auxiliary data are transmitted over such a link.

Method and apparatus for sending auxiliary data on a TMDS-like link

Techniques to transmit auxiliary data are disclosed. One technique includes generating a control signal from a video data enable signal and an auxiliary data enable signal, and combining an auxiliary data signal and a video data signal into a composite data signal using the control signal. Techniques to receive the auxiliary data are also disclosed.

Growing community of inventors

San Jose, CA, United States of America

William Conrad Altmann