Methods for generating an AV bitstream (e.g., an MPEG-2 transport stream or bitstream segment having adaptive streaming format) such that the AV bitstream includes at least one video I-frame synchronized with at least one audio I-frame, e.g., including by re-authoring at least one video or audio frame (as a re-authored I-frame or a re-authored P-frame). Typically, a segment of content of the AV bitstream which includes the re-authored frame starts with an I-frame and includes at least one subsequent P-frame. Other aspects are methods for adapting such an AV bitstream, audio/video processing units configured to perform any embodiment of the inventive method, and audio/video processing units which include a buffer memory which stores at least one segment of an AV bitstream generated in accordance with any embodiment of the inventive method.

The present technique relates to a data processing apparatus and a data processing method each of which enables a burden imposed on processing on a reception side to be reduced.

A data processing apparatus produces signaling containing a Null cell number exhibiting the number of Null cells of cells of a sub-frame included in a physical layer frame, and processes the signaling so as for the signaling to be contained in a preamble of the physical layer frame, thereby enabling a burden imposed on processing on a reception side to be reduced. The present technique, for example, can be applied to data transmission complying with the broadcasting standards such as ATSC3.0.

Provided is a transmission apparatus that sequentially transmits each audio data unit of audio data to a reception side via a predetermined transfer channel. A counter value and a parity value associated with the counter value are, for every predetermined number of audio data units, added to the audio data. The counter value and the parity value added for every predetermined number of audio data units change according to an encryption state.

The present disclosure relates to a transmission device and reception device for data in a wireless AV system. The transmission device comprises: a processor for encoding media data thereby generating a compressed bitstream; and a communication unit for: fragmenting the compressed bitstream and mapping the compressed bitstream to an MSDU; generating, for transmission of the MSDU, an MPDU frame sequentially comprising an MAC header, a frame body, and an FCS for the MAC header; generating, for the transmission of the MPDU frame, a PPDU sequentially comprising a preamble, at least one PSDU, and a TRN field; and transmitting the PPDU frame through a radio channel. A radio resource for transmission of actually necessary data can be secured by minimizing unnecessary overhead information (i.e., control-related information in the MAC header) from among data transmitted over radio.

In a video signal transmission system using fiber optic cable, an improved optical transceiver module (fiber module) having integrated video signal processing capabilities can be used in video signal transmitters for video sources, video signal receivers for display devices, or video switching devices. The improved fiber module has a form factor complying with the Small Form-factor Pluggable standard, and a standard optical fiber connector. In addition to an optical transceiver, the improved fiber modules includes a ¼ inch signal processing chip programmed to perform video signal processing. The mainboard of the video signal transmitter or receiver or the video switching device has additional signal processing chips for processing non-video signals such as audio, data, network, RS-232, and IR remote control signals, but they do not perform video signal processing. Another embodiment is a fiber optic cable with an electrical signal connector module that integrates a video signal processing chip.

A system and method for identifying a viable channel within an allocated downstream spectrum and establishing communication via a modem thereon. The disclosed technology provides for the broadband analysis of some or all of the available downstream spectrum to obtain a mapping of available channels and directing the modem to establish downstream communication upon at least one of these channels. The system includes an interface via which a user can specify parameters governing the analysis of the available downstream spectrum and the identification of a viable downstream channel.

A method and apparatus is disclosed for enabling synchronous capture of forward and return signals at a remote PHY device for detecting CPD. The remote PHY device provides the forward signal to and receives the return signal from a coaxial cable plant. The return signal contains an actual CPD signal generated by an interaction between the forward signal and a CPD source in the cable plant. The forward signal propagates from the remote PHY device to the CPD source and the actual CPD signal propagates from the CPD source to the remote PHY device all within a round-trip interval. The method comprises: capturing the forward signal from an output associated with the remote PHY device; generating from the forward signal a simulated CPD signal having frequencies in a return channel; band-limiting the simulated CPD signal to the return channel to produce a reference CPD signal; supplying the reference CPD signal to the remote PHY device; in the remote PHY device, receiving the reference CPD signal in the return channel; and (f) in the remote PHY device, capturing the return signal from the return channel over a capture duration of at least the round-trip interval. The reference CPD signal is used to detect the actual CPD signal from the return signal.

A method of detecting CPD in an HFC network that includes a remote PHY device (RPD) is disclosed. The RPD includes a transmitter, receiver, and diplexer having forward and return legs. The receiver receives a return signal from a cable plant via the return leg. The transmitter provides a forward signal to the cable plant via the forward leg. A portion of the forward signal leaks through the return leg and travels to the receiver. The return signal contains a CPD signal generated by the forward signal and a CPD source in the cable plant. The forward signal propagates from RPD to CPD source and CPD signal propagates from CPD source to RPD within a round-trip interval. The method comprises: (a) adjusting the capturing bandwidth of the receiver to include return and leaked forward signals; (b) operating receiver to capture return and leaked forward signals over a limited duration of at least the round-trip interval; and (c) detecting CPD signal by processing captured leaked forward and return signals.

Systems and methods related to battery triggering for activation of an optical data interconnect system are described. One aspect includes signal conversion electronics configured to convert received optical signals to an electrical signal. An amplifier may convert the electrical signal to differential electrical signals and transmit the differential electrical signals to a sink. A first conductor and a second conductor may interface the amplifier with a sink side resistor network. The first conductor and the second conductor may conduct a composite signal including the differential electrical signals and a first power signal from the sink side resistor network. A filter connected to the first conductor and the second conductor may be configured to receive the composite signal, and filter a second power signal from the composite signal that is at least a portion of the first power signal. A voltage regulator may connect the second power signal to the amplifier.

A video signal transmitter or receiver for handling multiple video signals, including mainboard signal processing circuitry, one master fiber module, and one or more add-on fiber modules. Video data signal for the multiple videos are transmitted over the master and add-on fiber modules, but no video control signal is transmitted over any add-on fiber module. Video control signal for all of the multiple videos are transmitted on a first subset of channels of the master fiber module in a multiplexed manner. The mainboard signal processing circuitry cooperates with the signal processing chip of the master fiber module to process all video control signals, with the master fiber module processing video control signals for at least two videos. Non-video signals are processed by the mainboard circuitry and transmitted on a second subset of channels of the master fiber module (same as or different from the first subset of channels).