Dolby Laboratories

About: Dolby Laboratories is a company organization based out in Amsterdam, Netherlands. It is known for research contribution in the topics: Audio signal & Audio signal flow. The organization has 956 authors who have published 1726 publications receiving 29456 citations.

Voice activity detector for audio signals

Abstract: According to one aspect, a method for detecting voice activity is disclosed, the method including receiving a frame of an input audio signal, the input audio signal having an sample rate; dividing the frame into a plurality of subbands based on the sample rate, the plurality of subbands including at least a lowest subband and a highest subband; filtering the lowest subband with a moving average filter to reduce an energy of the lowest subband; estimating a noise level for each of the plurality of subbands; calculating a signal to noise ratio value for each of the plurality of subbands; and determining a speech activity level of the frame based on an average of the calculated signal to noise ratio values and a weighted average of an energy of each of the plurality of subbands. Other aspects include audio decoders that decode audio that was encoded using the methods described herein.

Eyeglasses for personal and commercial use including reuse in 3d theater and other repeated operations

Abstract: 3D glasses including features for an enhanced viewing experience with lower production and operating costs for theaters. Keyed lenses and removable temples facilitate assembly and field repairs. Specific angles of lens placement, and the provision of specific anti-reflective areas on the frames enhance the quality of the optical path content being viewed. RFID and radio chips increase accountability and collection of use statistics. Smooth areas enhance cleaning and lower the time and material costs for between use cleanings.

Processing object-based audio signals

Abstract: An audio processing system and method which calculates, based on spatial metadata of the audio object, a panning coefficient for each of the audio objects in relation to each of a plurality of predefined channel coverage zones. Converts the audio signal into submixes in relation to the predefined channel coverage zones based on the calculated panning coefficients and the audio objects. Each of the submixes indicating a sum of components of the plurality of the audio objects in relation to one of the predefined channel coverage zones. Generating a submix gain by applying an audio processing to each of the submix and controls an object gain applied to each of the audio objects. The object gain being as a function of the panning coefficients for each of the audio objects and the submix gains in relation to each of the predefined channel coverage zones.

Edge directed image processing

Abstract: Information is accessed, which relates to an edge feature of an input video image at an input resolution value. The information relates multiple input image pixels to the edge feature, which has a profile characteristic. The information includes, for input pixels that form a component of the edge feature, an angle value corresponding thereto. An output image is registered, at an output resolution value, to the input image. Based on the registration, the edge feature related information is associated with output pixels. The associated information designates at least some of the output pixels as registered with the input image edge feature and the corresponding edge angle value. Edge component input pixels are selected based on the edge angle value. The selected edge component input pixels are processed, which deters deterioration of the profile characteristic of the edge feature in the output image.

End-to-End Delay for Hierarchical B-Pictures and Pulsed Quality Dual Frame Video Coders

Abstract: Real-time video applications require tight bounds on end-to-end delay. Hierarchical bi-directional prediction requires buffering frames in the encoder input buffer, thereby contributing to encoder input delay. Long-term frame prediction with pulsed quality requires buffering at the encoder output, increasing the output buffer delay. We compare the end-to-end delay of these two approaches using simulations to determine the delay vs. compression efficiency trade-off.