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Last Updated: 20050816, mei

P3 - Restoration, Storage & Car Audio

Friday, October 7, 1:30 pm — 3:30 pm

Chair: Brett Crockett, Dolby Laboratories - San Francisco, CA, USA

P3-1 Preferred Listening Levels in the Automotive EnvironmentEric Benjamin, Brett Crockett, Dolby Laboratories - San Francisco, CA, USA
In recent years the automobile passenger compartment has become increasingly important as a location in which entertainment, primarily audio entertainment, is consumed. Listener preference for dialog levels in the domestic environment is fairly well understood, and it follows conversational speech levels. It has been known for some time that preferred listening levels for music are higher than those for dialog, and it has also been observed that because of the high ambient noise levels in the automobile passenger compartment that higher listening levels are used in order to bring the reproduction levels above the noise level. What is the range of noise levels within the automobile passenger compartment and how does that affect listener preference for sound reproduction levels?
Convention Paper 6533 (Purchase now)

P3-2 High Frequency Compensation for Compressed Digital Audio Using Sampled-Data ControlKoji Fujiyama, Naoya Iwasaki, Riku Kaibe, Hiroshi Kano,, SANYO Electric Co., Ltd. - Hirakata, Osaka, Japan; Yutaka Yamamoto, Kyoto University - Kyoto, Japan
The demands are growing for improving the quality of compressed digital audio as portable non-CD players become popular. Because high compression causes poor sound quality, a solution to improve it is being sought. An effective solution is to generate high frequency components from the lower one. We propose the idea of using imaging components and digital filters designed using "Sampled-Data Control" to minimize the error between an assumed original analog signal and interpolated digital signal. We successfully improved the sound quality of compressed audio by realizing the close frequency spectrum to CD especially for the sound with low bit rate.
Convention Paper 6534 (Purchase now)

P3-3 Are There Criteria to Evaluate Optical Disc Quality that Are Relevant for End-Users?Jean-Marc Fontaine, Jacques Poitevineau, Laboratoire d'Acoustique Musicale - Paris, France
This paper deals with long-term preservation of sound and audiovisual heritage collections. Once-recordable optical discs (among other media) can fulfill such an objective, provided rigorous measures are taken, essentially through careful inspection of the discs by means of a specific equipment. We have studied disc quality criteria by considering thoroughly end-users applications, especially during data transfer processing (initial quality) and later accesses to existing collections (aging behavior). We show that error rates cannot be adopted as unique quality descriptors and other parameters have to be defined, e.g., from the data provided by our research-grade analyzer. A multidimensional statistical method such as Principal Component Analysis (PCA) gives promising indications toward this goal. The studies we have been conducting for many years are now reinforced thanks to the constitution of a network (Groupe d’Intérêt Scientifique-GIS in France) that combines complementary abilities and research equipment.
Convention Paper 6535 (Purchase now)

P3-4 An Open Design and Implementation for the Enabler Component of the Plural Node Architecture of Professional Audio DevicesJun-ichi Fujimori, Yamaha - Hamamatsu, Japan; Harold Okai-Tettey, Richard John Foss, Rhodes University - Grahamstown, South Africa
The Plural Node architecture is an implementation architecture for professional audio devices that adhere to the Audio and Music (A/M) protocol. The Plural-Node implementation architecture comprises two components on separate IEEE 1394 nodes—a “Transporter” component dedicated to A/M protocol handling and an “Enabler” component that controls the Transporter and provides high level plug abstractions. An open generic transporter specification has been developed for the transporter component. This paper details an open design and implementation for the enabler component that allows for connection management via abstract mLAN plugs.
Convention Paper 6536 (Purchase now)

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