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.

Audio signal processing

Abstract: In an audio coding system, an encoding transmitter represents encoded spectral components as normalized floating-point numbers The transmitter provides first and second control parameters that may be used to transcode the encoded spectral parameters A transcoder uses first control parameters to partially decode the encoded components and uses second control parameters to re-encode the components The transmitter determines the second control parameters by analyzing the effects of arithmetic operations in the partial-decoding process to identify situations where the floating-point representations lose normalization Exponents associated with the numbers that lose normalization are modified and the modified exponents are used to calculate the second control parameters

Systems And Methods For Rendering 3D Image Independent Of Display Size And Viewing Distance

Abstract: Methods and systems for providing and rendering 3D depth information are described. Specifically, the 3D depth information includes z-axis values provided in a normalized percentage format, that defines the position of an object relative to an infinity plane, a display screen, and a viewer, and can be used to render one or more images independent of display screen size and viewing distance.

Bit Error Correction without Redundant Data: a MAC Layer Technique for 802.11 Networks

Abstract: In wireless network monitoring, received packets such as MAC frames may contain bit errors. Such errors either makes the monitoring data less accurate, or forces the monitoring software to drop errored frames to avoid such inaccuracy. We present a MAC layer based measurement technique for monitoring 802.11 networks. It can correct bit errors in certain MAC headers without the use of FEC or redundant data. This allows greater accuracy and/or extended range in network monitoring even when signal reception is less than ideal. This technique has several other applications. First, it provides better support for cross-layer protocols such as UDP-Lite, because a MAC frame with a corrupted destination MAC address would have been discarded in the OS stack even with UDP-Lite enabled. Second, the technique allows blind estimation of bit error rate in the received MAC frame, so that a multimedia decoder can decide to whether perform soft-decoding on the corrupted media payload, or to rely on previous media packet for error concealment. Finally, it facilitates the use of NAK frames, which could improve 802.11 MAC layer performance if such modifications are adopted. We evaluate our technique in an 802.11 testbed, quantifying its performance gain over a normal 802.11 monitoring application.

Improvements in helical scan recording and playback systems

Abstract: A helical scan magnetic recording and reproducing system is of the type where time compressed audio signals are recorded in extensions of the video tracks. In orderto avoid a time delay of the reproduced audio relative to its original relationship to the video, additional audio playback heads (S1, S2) are located on the helical scanner so as to read the audio information sufficiently in advance of the video heads (P1, P2) to allow restoration of the original audio/video synchronism. The audio is recovered by a switch (26), de-interleaving circuit (28) - and time expansion circuits (30, 32). The arrangement allows full flexibility in audio editing even when the recorded audio signals are digitally encoded and interleaved. In order to avoid a time delay of the reproduced audio relative to the video when played back, additional audio recording heads are located on the helical scanner so as to record the audio information on tracks that when played back are reproduced sufficiently in advance of the video to allow restoration of the original audio/ video synchronism. The arrangement can thus can be employed to produce prerecorded tapes having time advanced audio such that synchronous audio/video is reproduced on conventional playback reproducing systems.

Upgradeable engine framework for audio and video

Abstract: An audio/video (A/V) system includes an audio/video (A/V) component configured to generate audio or video data. The A/V system includes one or more processing devices configured to implement an audio or video processing engine to process the audio or video data to generate one or more different domain representations of the audio or video data. The A/V system includes one or more audio or video processing applications that are each configured to access one or more of the different domain representations of the audio or video data, and to perform audio or video processing on the one or more accessed domain representations of the audio or video data. Each of the one or more processing applications access and process the domain representations independently of each other.