Dolby E

Abstract: Multiple channels of audio are combined either to a monophonic composite signal or to multiple channels of audio along with related auxiliary information from which multiple channels of audio are reconstructed, including improved downmixing of multiple audio channels to a monophonic audio signal or to multiple audio channels and improved decorrelation of multiple audio channels derived from a monophonic audio channel or from multiple audio channels. Aspects of the disclosed invention are usable in audio encoders, decoders, encode/decode systems, downmixers, upmixers, and decorrelators.

Abstract: Commonly used audio file formats relate directly to the audio channels, i.e. the audio information is stored like it is fed to the loudspeaker. However, for obtaining a general description of audio information, a paradigm shift is necessary. Instead of storing the loudspeaker channels, a new audio format may use the description of the spatial sound field. A method for encoding or transmitting an audio signal comprises the steps of providing one or more audio source signals (X src ), determining for each of said audio source signals a specific position to which it relates, generating data sets containing the determined positions (r src ) of the audio sources, and encoding or transmitting (62) the data sets together with said audio source signals. Advantageously, this allows conversion into Higher Order Ambisonics (HOA) format and subsequent re-conversion into conventional audio data that can be adapted to a given loudspeaker configuration.

Abstract: Fundamentals of Audio and Acoustics Psychoacoustics and Perception Acoustical Noise Control Acoustical Treatmen t for Ind oor Ar eas Acoustics for General Purpose Rooms Acoustics for Auditoriums and Concert Halls Acoustics for Stadiums and Outdoor Venues Acoustics for Cinemas Modeling and Auralization Resistors, Capacitors, and Inductors Audio Transformers and their Uses Tubes, Discrete Solid-State Devices, and Integrated Circuits Heat Sinks and Relays Transmission Techniques--Wire Microphones Loudspeakers, Enclosures, and Headphones Loudspeaker Cluster Design Power Supplies Amplifier Design Preamplifiers and Mixers Atenuators Filters and Equalizers Delay Mixing Consoles VI Meters and Devices Disk Recording and Playback Magnetic Analog and Digital Recording and Playback MIDI Compact Discs, DVD Audio and Video, SACD and other Digital Media DSP Technology Grounding Gain Structures Sound System Design Computer-Aided Sound System Design Designing for Speech Intelligibility In-Ear Monitoring Virtual Systems Digital Audio Interfacing and Networking Complete Interpretation Systems Assistive Listening Systems Intercoms Image Projection Dolby Surround and Dolby Digital Audio Measurements Fundamentals and Units of Measurements Loudspeakers Loudspeaker Cluster Design Preamplifiers and Mixers Analog Consoles and Systems Digital Consoles Compact Discs, DVD Audio and Video, SACD and other Digital Media MIDI Sound System Design Designing a Sound System with a Computer Gain Structures Grounding Virtual Systems Digital Audio Interfacing and Networking Designing for Speech Intelligibility Modeling and Auralization Dolby Surround Sound Audio Measurements Digital Media Fiber Optic Transmission Intelligibility:

Abstract: Method and apparatus for high-speed reproduction of a customized group of audio programs on a slave medium enables the reproduction of musical recordings at a point-of-sale terminal. Master programs are prerecorded by a Dolby ADM (adaptive delta modulated) technique to condense their "information" content and permit higher data throughput during high-speed reproduction. In a "premastering" process to make encoded masters, a special multiplexer board provides interfacing between Dolby ADM digital audio data and a conventional data processing system. The multiplexer board performs computer-like data blocking and also writes a unique sync code directly in the data block. The data processing system also catalogs and edits the blocked digital audio; places encrypted catalog, pricing, and other indicia in the data file representing the music; and sends the data file to a conventional 16-bit PCM file writer for making encoded CD music ROMS which contain the ADM data representing the encoded audio program. A high-speed reproduction device, under control of a desk top personal computer, extracts timing and ADM data from the CD music ROM at high speed and controls high-speed tape drives to compile selected recordings on a single cassette tape in a form compatible with Dolby B noise reduction.