Abstract: The present invention discloses methods of archiving and optimizing lectures, presentations and other captured video for playback, particularly for blind and low vision individuals. A digital imaging device captures a preselected field of view that is subject to periodic change such as a whiteboard in a classroom. A sequence of frames is captured. Frames associated with additions or erasures to the whiteboard are identified. The Cartesian coordinates of the regions of these alterations within the frame are identified. When the presentation is played back, the regions that are altered are enlarged or masked to assist the low vision user. In another embodiment of the invention, the timing of the alterations segments the recorded audio into chapters so that the blind user can skip forward and backward to different sections of the presentation.

Abstract: A scanning projector includes a mirror that scans in two dimensions, at least one of which is sinusoidal. A digital phase lock loop locks to the sinusoidal movement of the mirror. A free-running pixel clock is provided. An interpolation component interpolates pixel intensity data from adjacent pixels based on the position of the mirror when a pixel clock arrives.

Abstract: Method, device, computer program and information storage means for transmitting a source frame into a video display system, the video display system (10) comprising a plurality of projectors, the video display system (10) further arranged to produce a projected image (106) from the source frame (100), each projector (102, 103, 104, 105) arranged to display a sub-frame (106A, 106B, 106C, 106D) of the projected image (106). The video display system further comprises capability to arrange a display delay, equal to a delay between reception of a source frame synchronization signal and a sub-frame display synchronization signal, dependent on the positions and the orientations of the video projectors, such that display of the projected image begins before at least one projector has received an associated complete sub-frame.

Abstract: A PLL circuit (1a, 1b) for generating a pixel-clock signal based on a hsync signal. The PLL circuit comprises a phase-frequency detector arranged to receive the hsync signal and a frequency divided pixel-clock signal, and generate up and down signals based on the hsync signal and the frequency-divided pixel-clock signal. A charge pump (20) is arranged to generate an output signal based on the up and down signals and a loop filter (30) is arranged to generate a frequency-control signal based on the output signal of the charge pump (20). Furthermore, a VCO (40a, 40b) is arranged to generate an oscillating signal and adjust the frequency of the oscillating signal in response to the frequency-control signal. The VCO (40a, 40b) is adapted to have a tuning range with a center frequency which is larger than or equal to 4 GHz.

Abstract: Techniques for synchronizing audio and video content for presentation to a user at a same rate are provided. Streams of content from two or more sources of media, each media source having an associated clock, are synchronized by a synchronizing component and processor with respect to a master clock. As well, techniques are provided for ensuring that output devices are synchronized at preview startup. That is, such techniques ensure that the output devices start playing the media at the same time as well as at the same rate.

Abstract: The addition of temporal positions to an inverted index allows for temporal queries in addition to phrase queries. Store additional binary data for each term instance in the word-level index to prepare for searching in response to time-based queries from a user is accomplished through the use of Lucene's binary payload feature where the payload structure is defined for use in such searches. The pre-defined payload fields consist of three integers, which account for 12 extra bytes that must be stored for each term instance. A content database on the Master/Administrator server node provides the indexes for search into content in response to user events, returning results in JSON format. The search results may then be used to locate and present content segments to a user containing both requested search term results and the time location and duration within a content asset where the search term(s) is found.

Abstract: An apparatus includes an image segment classification means that analyzes an input video to generate image segment groups each segment including image segments which include an identical object; a sound segment classification means that analyzes the input video to generate sound segment groups each segment including sound segments which include an identical object; an inter-segment group score calculation means that calculates a similarity score between each image segment group and each sound segment group; and a segment group correspondence decision means that decides, using the scores, whether or not an object in the image segment groups and an object in the sound segment groups are the same.

Abstract: Some embodiments of the invention provide a method for synchronizing an audio stream with a video stream. This method involves searching in the audio stream for audio data having values that match a distinct set of audio data values and synchronizing the audio stream with the video stream based on the search. In some embodiments, the distinct set of audio data values is defined by a predetermined distinct tone. In other embodiments, the distinct set of audio data values is defined by audio data contained in the video stream.

Abstract: A method and device for synchronizing audio/video signals is provided. A first and a second auxiliary signal are generated, wherein the first and the second auxiliary signals are pulse-shaped, and transmitted to a first and a second rendering device via a first and a second transmission path, respectively. The first audio/video output signal based on the first auxiliary signal and a second audio/video output signal based on the second auxiliary signal are outputted to a user. The user adjusts a delay of the first and/or second transmission path by synchronizing the first audio/video output signal with the second audio/video output signal.

Abstract: Presented herein is a method of presenting alternative audio content for an audio/visual content segment, such as a television program or a motion picture. In the method, the audio/visual content segment is received into a media content receiver. The audio/visual content segment includes primary visual content and primary audio content. A request to receive alternative audio content for the audio/visual content segment is transmitted. After transmitting the request, the alternative audio content is received into the media content receiver. The primary audio content is replaced with the alternative audio content to generate a revised audio/visual content segment. The revised audio/visual content is transferred for presentation to a user.

Abstract: A display apparatus can avoid a load increase and display rapidly the video of a selected channel. The display apparatus includes a synchronizing unit. The synchronizing unit adjusts a timing, in which a video is displayed based on a predetermined reference frame received and decoded at first after channel selection, toward shifting earlier than a time of original display of the video based on a time information attached to the reference frame.

Abstract: A system and method for characterizing the relative offset in time between audio and video signals and enables the receiver of the audio and video signals to resynchronize the audio and video signals. Signal characterization data is dynamically captured and encoded into frames of video and audio data that is output by a television origination facility. The signal characterization data is extracted by the receiver and signal characterization data is recomputed for the received frames. The extracted signal characterization data is compared with the recomputed signal characterization data to compute the relative offset in time between the video and one or more audio signals for a frame. The receiver may then resynchronize the video and audio signals using the computed relative offset.

Abstract: A method for enriching digital photographs, the method comprising: receiving a digital photograph and video data captured before a time at which the digital photograph is captured until after said time, wherein the video data comprises a sequence of video frames; processing the digital photograph and the video frames to layer the digital photograph and the video frames into a plurality of layers thereby creating a plurality of video layer sequences; defining an order of the plurality of layers; generating playback guidance, the playback guidance defining how to combine the video layer sequences during playback; and transmitting the order, the video layer sequences and the playback guidance to a display device for playback.

Abstract: According to one configuration, a computer environment includes a first monitoring system, a second monitoring system, and an analyzer. The first monitoring system produces video of an item being entered into a point of sale system. The second monitoring system monitors events associated with entering of the item into the point of sale system. The analyzer detects, via a communication from the second monitoring system, an occurrence of at least one event associated with entering of the item. Based on communication, the analyzer correlates the at least one event to a particular time in the video when the at least one event occurred.

Abstract: Embodiments of the present invention may provide a clock and timing generation scheme for a video signal processor (e.g., a scaler), which enables fast switching between different input video standards without disturbing the output clock or timing. The scheme also may minimize the number of video frames that are dropped or repeated at the output. This may be achieved by locking the video's output timing to the input timing and also by utilizing a frame buffer to remove instantaneous discontinuities caused when an input is changed.

Abstract: A video signal and an audio signal are transmitted from a source device to a sink device in conformity with respective predetermined interfaces through respective transmission channels. The respective interfaces include bidirectional interface such as an HDMI and an IEEE1394. A controller acquires delay information (TLv) representing the total delay time of the devices connected to the transmission channels conforming to the bidirectional interface and corrects the difference in reproduction time between the video and audio signals by using the acquired delay information (TLv).

Abstract: It is difficult to implement a conventional phase lock loop circuit in a sink device within an HDMI system because the low frequency input causes the conventional phase lock loop circuit to absorb unnecessary noise during a long waiting period. Therefore, the present invention provides a low jitter clock regenerator comprises: an input clock; a divider to divide said input clock into a slower clock; a phase lock loop circuit to regenerate said slower clock to a reference clock; and a parameter transformer to tune said divider and said phase lock loop circuit to increase the adjustment speed of said phase lock loop circuit. The present invention also provides a method to reorganize parameters in order to create new parameters which are better suitable for a clock recovery circuit in a sink device within an HDMI system.

Abstract: Systems and methods are operable to synchronize presentation between video streams and separately received audio streams. An exemplary embodiment receives a first media content stream at a media device, wherein the first media content stream comprises at least a video stream portion; receives a second media content stream at the media device, wherein the second media content stream comprises at least an audio stream portion; delays the audio stream portion of the second media content stream by a duration corresponding to at least one synchronization time delay; communicates the video stream portion of the first media content stream to a visual display device; and communicates the delayed audio stream portion of the second media content stream to an audio presentation device, wherein a visual scene of the video stream portion of the first media content stream is substantially synchronized with sounds of the audio stream portion of the second media content stream.

Abstract: A television receiver computes a delay time of an image displayed on the television receiver with respect to an audio signal transmitted from the television receiver to an audio amplifier, based on video delay information as EDID data, delay information transported from a disc recorder and information of a time required until audio data received from the disc recorder is transmitted to an audio amplifier. The audio amplifier controls a delay time lasting until the audio responsive to the received audio data is outputted so that the delay time matches the aforementioned delay time. Thereby, the displayed image in the television receiver and the audio output in the audio amplifier are synchronized.

Abstract: Embodiments of the present invention provide systems and methods for non-invasive, “in-service” AV delay detection and correction. These systems and methods do not modify the audio signal or the video signal, nor do they rely on any metadata to be carried with the audio signal or the video signal via the distribution path. Instead, agents located at various points along the distribution path generate very small signature curves for the audio signal and the video signal and distribute them to a manager via a separate data path other than the distribution path. The manager calculates a measured AV delay caused by the distribution path based on these signature curves, and then optionally corrects the measured AV delay by adjusting an in-line delay in the distribution path.

Abstract: A video processing system may include a video deserializer, a video serializer and a programmable video processing device. The video deserializer may have an input for receiving a serial data stream containing video data and a serial to pseudo-parallel converter, coupled to the serial data stream, for generating a plurality of serial output lanes from the serial data stream. The video serializer may have a plurality of inputs for receiving serial data streams and a pseudo-parallel to serial converter, coupled to the plurality of input serial data streams, for generating a single serial data stream from the plurality of input serial data streams. The programmable video processing device may be coupled to the video deserializer and the video serializer, and may have a plurality of interface pins for receiving the plurality of serial output lanes from the deserializer and for transmitting the plurality of serial data streams to the serializer.

Abstract: According to one embodiment, a content synchronizing method includes: first transmitting when receiving an acquiring request for reference time to determine a timing to synchronize a plurality of pieces of content executed by a plurality of modules with each other from a first module out of the modules, the acquiring request for the reference time to a second module out of the modules; receiving source information indicating an acquisition source of the reference time from the second module; and acquiring reference time information indicating the reference time from the acquisition source indicated by the source information, wherein second transmitting to the first module, together with the reference time information, processing time information indicating processing time from receiving the acquiring request until transmitting the reference time information, the processing time information being used to calculate a time lag between time in the first module and the reference time.

Abstract: A multi-modal quality estimation unit (11) estimates a multi-modal quality value (23A) on the basis of an audio quality evaluation value (21A) and a video quality evaluation value (21). In addition, a delay quality degradation amount estimation unit (12) estimates a delay quality degradation amount (23B) on the basis of an audio delay time (22A) and a video delay time (22B). A video communication quality estimation unit (13) estimates a video communication quality value (24) on the basis of a multi-modal quality value (23A) and a delay quality degradation amount (23B).

Abstract: A synchronization signal control circuit according to embodiments includes a phase difference detecting section and a vertical synchronization correction control section. When a vertical synchronization period of an input video signal is within a compensation period range between a minimum vertical synchronization period and a maximum vertical synchronization period, the synchronization signal control circuit outputs a display vertical synchronization signal used for displaying the input video signal to a display section capable of providing a display based on the input video signal. The phase difference detecting section detects a phase difference between an input vertical synchronization signal based on the input video signal and the display vertical synchronization signal. The vertical synchronization correction control section corrects the cycle period of the display vertical synchronization signal within the compensation period range so as to reduce the phase difference.

Abstract: A display controller 102 sequentially outputs at least two image signals, thereby allowing an image to be displayed on a liquid crystal display section 105 in accordance with the image signals, wherein among the image signals to be outputted, an image signal of a first output image and an image signal of a second output image have a relationship that provides an image having no correlation to the first output image when image brightness values of the respective signals are added for each pixel, and wherein a frame frequency when the image signal is outputted is an integral multiple of a frame frequency for an image signal of an input image, the integral multiple being two or more.

Abstract: A system and method for characterizing the relative offset in time between audio and video signals and enables the receiver of the audio and video signals to resynchronize the audio and video signals. Signal characterization data is dynamically captured and encoded into frames of video and audio data that is output by a television origination facility. The signal characterization data is extracted by the receiver and signal characterization data is captured for the received frames. The extracted signal characterization data is compared with the captured signal characterization data to compute the relative offset in time between the video and one or more audio signals for a frame. The receiver may then resynchronize the video and audio signals using the computed relative offset.

Abstract: A process to detect video glitches and audio-video synchronization errors arising during playback or capture. The process encodes an external time stamp into video and audio streams directly at the output of a digital media playback device. The process captures the stamped video and audio streams and analyzes the external stamp by comparing it with a presentation time stamp and a capture time stamp.

Abstract: A method includes synchronizing audio and video streams including aligning the audio path and the video path by introducing a variable delay to the audio path or the video path to substantially equalize the end-to-end delay of both the audio path and the video path. An apparatus includes a digital to analog convertor for synchronizing audio and video where the audio path and the video path are aligned by introducing a variable delay to the audio path or the video path to substantially equalize the end-to-end delay of both the audio path and the video path.

Abstract: To solve the problems in the prior art, the present invention provides a method for measuring a time difference between digital video signals and digital audio signals, wherein said method comprises the steps of extracting respective time series data from respective frequency domains of said digital video signals and said digital audio signals; statistically identifying the cross-correlation of said time series data in said frequency domains, thereby measuring the time difference between said digital video signals and said digital audio signals.

Abstract: This invention relates to a device and a method of generating a first and a second fingerprint (102,104) usable for synchronization of at least two signals (101,103) and corresponding method and device for synchronizing two or more signals. A fingerprint pair is generated on the basis of a segment of a first signal e.g. an audio signal and of a segment of a second signal e.g. a video signal at each synchronization time point. The generated fingerprint pair(s) are stored in a database (203) and communicated or distributed to a synchronization device (303). During synchronization, fingerprint(s) of the audio signal and fingerprint(s) of the video signal to be synchronized are generated and matched against fingerprints in the database. When a match is found, the fingerprints also determine the synchronization time point, which is used to synchronize the two signals. In this way, a simple, reliable and efficient way of synchronizing at least two signals is obtained.

Abstract: Methods of generating a pixel clock signal for a multimedia source are provided in which a transmission clock signal having a first frequency is generated from a reference clock signal that has a second frequency. The generated transmission clock signal is multiplied by a multiple to generate the pixel clock signal. The pixel clock signal has a third frequency that is the product of the second frequency and the multiple.

Abstract: Measurement of the relative timing between images and associated information, for example video and audio. Image mutual event characteristics are recognized in the images and associated mutual event characteristics are recognized in the associated information. The image mutual events and associated mutual events are compared to determine their occurrences, one relative to the other as a measure of relative timing. Particular operation with audio and video signals is described.

Abstract: An apparatus for performing a correlation between a test sound signal replayable at variable speed and a reference sound signal, which is a digitally stored version of the test sound signal, has a determinator for determining a measure for the replay speed of a test sound signal; a variator for varying a test sound signal sampling rate, to generate a modified test sound signal depending on the measure for the replay speed, or for varying a reference sound signal sampling rate, to generate a modified reference sound signal depending on the measure for the replay speed, the variator being formed to vary the test or reference sampling rate so that a deviation between a test or modified test sound signal replay speed and a reference or modified reference sound signal replay speed is reduced; and a comparator for comparing the test or modified test sound signal and the reference or modified reference sound signal to obtain a correlation result.

Abstract: A pitch bearing for a wind turbine rotor comprises a rotor hub and at least one rotor blade, the pitch bearing comprising a cylindrical inner bearing ring connectable to a rotor blade of the wind turbine rotor, a cylindrical outer bearing ring connectable to the rotor hub of the wind turbine rotor and an annular reinforcement section for reinforcing the outer bearing ring. The annular reinforcement section adjoins the cylindrical outer bearing ring at its radial outer surface.

Abstract: An audio/video synchronous playback device includes a first synchronization section for repeating or skipping a first video data sequence in units of a video frame interval thereof to synchronize the first video data sequence with an audio data sequence, and a second synchronization section for repeating or skipping a second video data sequence in units of a video frame or video field interval thereof to synchronize the second video data sequence with the audio data sequence. A first video data sequence output and a second video data sequence output having different frame frequencies are separately synchronized with one channel of audio data sequence output with their respective precisions.

Abstract: A system and method for characterizing the relative offset in time between audio and video signals and enables the receiver of the audio and video signals to resynchronize the audio and video signals. Signal characterization data is dynamically captured and encoded into frames of video and audio data that is output by a television origination facility. The signal characterization data is extracted by the receiver and signal characterization data is captured for the received frames. The extracted signal characterization data is compared with the captured signal characterization data to compute the relative offset in time between the video and one or more audio signals for a frame. The receiver may then resynchronize the video and audio signals using the computed relative offset.

Abstract: A video signal synchronization signal generating apparatus for making a display reference synchronization signal Vb that serves as a reference of video display and has a first frequency and an input synchronization signal Vi that constitutes images and has a second frequency synchronized with each other, the apparatus including: a frequency ratio generating section configured to divide a frequency that is double the first frequency by the second frequency to calculate a frequency ratio n; a Vx generation comparator circuit section configured to generate coincidence signal Vx? having pulses that are inserted by equally dividing one period of the input synchronization signal Vi by the frequency ratio n; and a Vx generation circuit section configured to remove the alternate pulses of the coincidence signal Vx? to generate synchronization signal Vx of a same phase as the phase of the input synchronization signal Vi.

Abstract: An audio/video system comprises an audio signal processing path having an audio path delay and a video signal processing path having a video path delay. The audio path delay may be different from the video path delay. The audio path delay and/or the video path delay may change, for example because of replacement of a component within the audio signal processing path or the video signal processing path. Delay matching (synchronization) in the audio/video system comprises adjusting the audio path delay to be substantially equal to the video path delay. Matching the audio path delay to the video path delay generally includes adding delay to the signal processing path with the lesser delay.

Abstract: Systems and methods of conducting collaborative sessions between mobile devices may provide for determining a time delay associated with a set of participating mobile devices, and determining a command execution time based at least in part on a clock of a managing device and the time delay. One or more control messages may be transmitted to the participating mobile devices, wherein the control messages include the command and the command execution time. Upon receiving a control message, each participating mobile device may determine a local execution time based at least in part on the command execution time and an offset of the clock of the managing device relative to a local clock. Execution of the command can therefore be coordinated across the set of participating mobile devices.

Abstract: A system synchronizes a video presentation to a master time reference (e.g., a corresponding audio presentation) by modifying a video cadence. The system detects when a displayed video leads or lags a master time reference by a programmable level or more. The system minimizes the synchronization error by inserting or removing source video frames to or from a frame cadence pattern.

Abstract: A first frame of data is encoded and a first timestamp associated with the first frame of data is generated. The first timestamp includes complete timing information. The first frame of data and the associated first timestamp is transmitted to a destination. A second frame of data is encoded and a second timestamp associated with the second frame of data is generated. The second timestamp includes a portion of the complete timing information. The second frame of data and the associated second timestamp is then transmitted to the destination. Additional frames of data are encoded and additional timestamps associated with the additional frames of data are generated. The majority of the additional timestamps include a portion of the complete timing information.

Abstract: A video horizontal synchronizer outputting a line timing signal and an indicating flag of a received video signal for use in a video signal post-processing unit, including a filter outputting a wide bandwidth filtered and a narrow bandwidth filtered signals of the received video signal, a dynamic slicer threshold generator generating a slicer threshold, a timing recovery circuit generating a phase error and the line timing signal, a phase error statistics circuit averaging the phase error to generate a average phase error, a HSYNC checker generating a matching flag indicating whether a periodic pattern appears in the narrow bandwidth filtered signal according to the line timing signal, and a finite state machine controlling the dynamic slicer threshold generator, the timing recovery circuit, the phase error statistics circuit and the HSYNC checker and generating an indicating flag when the average phase error is small enough and the matching flag is confirmed.

Abstract: Provided are a method and apparatus for reproducing digital broadcasting. The method includes parsing an input video stream to extract a presentation time stamp (PTS) and a compressed frame and decoding the extracted compressed frame to generate frames sequentially. If a PTS corresponding to a current frame does not exist, a virtual PTS is generated based on the extracted PTS The extracted PTS or the virtual PTS is compared with a system time clock (STC) in synchronization with a vertical synchronization signal and an output time of a display frame is determined.

Abstract: A process for scanning and/or synchronizing audio/video events is described. According to the process, a signal is acquired and divided into a plurality of segments corresponding to different moments of the signal. A spectrogram is generated and peaks are located in the spectrogram. Transition peaks are located among said peaks, and the bands of such transition peaks are combined in one or more transitions to which hashes correspond. The hashes are associated with the time at which the transitions occur in the signal. Means for scanning and/or synchronizing audio/video events are also disclosed.

Abstract: A method is provided for synchronising visual and audio data for a television system. The television system includes display means for displaying visual data thereon and audio means for allowing audio data to be sounded via said system. The method includes the steps of undertaking one of displaying a visual indicator on said display means or sounding an audio indicator via said audio means and, after a time delay or period of time, undertaking the other of displaying the visual indicator or sounding the audio indicator, the period of time between the display of said visual indicator and the sounding of said audio indicator being adjustable by a user of said television system using synchronisation means.

Abstract: A verbal description method and system. A computing system broadcasts first audio data and video data associated with the first audio data. The computing system determines that the video data comprises a graphic without a description in the first audio data. The computing system receives audible description data associated with the graphic. The computing system generates second audio data comprising the first audio data and the audible description data. The computing system synchronizes portions of the second audio data with associated portions of the video data. The computing system generates synchronized audio/video data comprising the portions of said second audio data aligned with the associated portions of said video data. The computing system broadcasts the synchronized audio/video data.

Abstract: A digital video editing and playback system and methods of editing and playing back digital video are provided. The system includes a video processor adapted to receive video segments from multiple sources. The video segments include synchronization information. The video processor includes software instructions adapted to be executed by the video processor. The software instructions are adapted to evaluate the synchronization information from various video segments and to form associations between video segments from different sources that correspond to a common event.

Abstract: A verbal description method and system. A computing system broadcasts first audio data and video data associated with the first audio data. The computing system determines that the video data comprises a graphic without a description in the first audio data. The computing system receives audible description data associated with the graphic. The computing system generates second audio data comprising the first audio data and the audible description data. The computing system synchronizes portions of the second audio data with associated portions of the video data. The computing system generates synchronized audio/video data comprising the portions of said second audio data aligned with the associated portions of said video data. The computing system broadcasts the synchronized audio/video data.

Abstract: A video audio system includes an audio processing apparatus capable of processing audio signals input from a plurality of input sources and a video processing apparatus capable of displaying a video image based on a video signal input from a selected input source. The video processing apparatus executes image processing based on the selected input source type notified by the audio processing apparatus, and transmits delay time information required for the image processing. The audio processing apparatus delays an audio signal based on the delay time information transmitted from the video processing apparatus.

Abstract: A clock recovery circuit in a digital display unit for recovering a time reference signal associated with analog display data. The clock recovery circuit includes a phase-locked loop (PLL) implemented in digital domain and an analog filter to eliminate any undesirable frequencies from the output signal of the PLL. The PLL includes independent control loops to track long term frequency drifts of the time reference signal and the transient phase differences respectively. By providing such independent control loops, the generated clock can be better synchronized with the time reference signal. This invention is directed to a method of scaling a source image formed of a number of source image elements to provide a destination image formed of a number of destination image elements using a line buffer and no frame buffer.