Analog Devices,inc.

Christian Willibald Bohm

Timothy J Cummins

Brian Paul Murray

Peter Hall

A system architecture allows for the transmission of multiple HDCP encrypted audio/video streams over a single unified cable to multiple receivers using a daisy chain topology. Each individual audio/video stream is first encrypted and then combined into a uniform stream, and the uniform stream is transmitted to each of the receivers. Each receiver contains a decryption engine that operates independently of the engines in the other receivers, therefore allowing each receiver to select to a unique channel and decrypt and display one of the audio/video streams.

Encryption topology for transporting multiple AV streams over a unified medium

A method and apparatus for maintaining communication between an HDMI sources and an HDMI sink by monitoring data received from the HDMI source, and, based on the monitoring, dynamically switching between a first and a second mode without user intervention. The device may include a head end connector, a tail end connector and a cable. The head end connector may include a controller, a memory and an electrical signal transceiver. The controller may monitor data output from the source, and based on the outputted data; the controller may determine whether to maintain a first communication method or a second communication method.

Method and apparatus for providing robust display digital channel transmission

Embodiments provide for a method for eliminating pathological sequences in a serial bit stream. Parallel data words having a first bit length are received. The received data words may be analyzed for a pathological sequence. If a pathological sequence is present in a data word, the data word containing the pathological sequence may be segmented into data segments having bit lengths less than a pathological sequence. The data word may be reformatted by generating reformatted data words having a second bit length. The reformatted data words may contain at least one of the data segments and the second bit length is greater than the first bit length. The reformatting may be performed by adding framing bits to the segments to form the reformatted data words. The reformatted data words are transmitted in place of the data word containing the pathological sequence.

Method and apparatus for improving the reliability of a serial link using scramblers

An apparatus and a method for providing serialized HDMI data from an HDMI source to an HDMI sink. An HDMI transmitter may include inputs including control inputs, a deserializer, and a parser. The inputs may receive serialized HDMI data from an HDMI data source. A deserializer may deserialize the serialized HDMI data received on each of the respective inputs and outputting parallel data for each of the inputs. A parser may parse the parallel data output from the deserializer from each of the respective inputs into serial video data at a first clock rate and audio data at a second clock rate. Control inputs of the transmitter may be set to a first mode in which from the deserializer is caused to bypass the parser, and the parallel data is output from the HDMI transmitter.

Method and apparatus for connecting HDMI devices using a serial format

A comb filter for use in a video decoder is described. The comb filter includes a line memory for storing as successive pairs of U and V samples of a decoded video signal corresponding to a previous horizontal line of video information and a line memory for storing a second previous horizontal line of video information. The filter also includes a circuit to calculate an average value of both U and V from a previous sample and a corresponding sample from a previous line. The filter also includes a circuit for calculating a correction term for each one of the averages. The correction term is calculated from the opposite color component as was used to calculate the average value.

Adaptive comb filter that cancels hugand cross-luminance errors

A video decoder is provided wherein digitized samples of an input video signal are produced at a fixed sampling rate and, from such digitized samples, a fixed number of re-sampled digitized samples are produced for each detected sync pulse included in the video signal. The re-sampled digitized samples are stored in a buffer memory and are retrieved from such buffer memory at a rate synchronized to the sync pulse. With such an arrangement, the analog to digital converter operates at a fixed sampling rate, and overflow situations are avoided.

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Rattenberg, Germany

Christian Willibald Bohm