AES New York 2007
Applications in Audio
Poster Session P8
Saturday, October 6, 9:30 am — 11:00 am
P8-1 Pump Up the Volume: Enhancing Music Phone Audio Quality and Power Using Supercapacitors for Power Management—Pierre Mars, CAP-XX (Australia) Pty. Ltd. - Sydney, NSW, Australia
As multimedia and music phones grow in popularity, consumers want an iPod-quality, uninterrupted audio experience without the buzzing and clicks associated with wireless transmission. This paper describes the problems delivering high power and high quality audio in music-enabled mobile phones and how a supercapacitor can overcome them. Typically, the audio amplifier power supply input in a mobile phone is connected directly to Vbattery. This paper compares audio performance between the typical setup and connecting the audio amp supply to a supercapacitor charged to 5V through a current limited boost converter.
Convention Paper 7206 (Purchase now)
P8-2 Digital Audio Processing on a Tiny Scale: Hardware and Software for Personal Devices—Peter Eastty, Oxford Digital Limited - Oxfordshire, UK
The design of an audio signal processor, graphical programming environment, DSP software, and parameter adjustment tool is described with reference to the hardware and software requirements of the audio sweetening function in personal devices, particularly cell phones. Special care is taken in the hardware design to ensure low operating power, small size (4mm*4mm package), or 0.5 to 1 sq. mm area depending on geometry, stereo analog, and digital I/O and high performance. The parameter adjustment tool allows real time control of the DSP so that processing may be customized to the actual properties of the audio sources and the acoustic properties of the enclosure and loudspeakers. A live demonstration of the programming and parameter adjustment of the processor will be given as part of the presentation of the paper.
Convention Paper 7207 (Purchase now)
P8-3 Enhancing End-User Capabilities in High Speed Audio Networks—Nyasha Chigwamba, Richard Foss, Rhodes University - Grahamstown, South Africa
Firewire is a digital network technology that can be used to interconnect professional audio equipment, PCs, and electronic devices. The Plural Node Architecture splits connection management of firewire audio devices between two nodes namely, an enabler and a transporter. The Audio Engineering Society’s SC-02-12-G Task Group has produced an Open Generic Transporter guideline document that describes a generic interface between the enabler and transporter. A client-server implementation above the Plural Node Architecture allows connection management of firewire audio devices via TCP/IP. This paper describes enhancements made to connection management applications as a result of additional capabilities revealed by the Open Generic Transporter document.
Convention Paper 7208 (Purchase now)
P8-4 Sharing Acoustic Spaces over Telepresence Using Virtual Microphone Control—Jonas Braasch, Daniel L. Valente, Rensselaer Polytechnic Institute - Troy, NY, USA; Nils Peters, McGill University - Montreal, Quebec, Canada
This paper describes a system that is used to project musicians in two or more co-located venues into a shared virtual acoustic space. The sound of the musicians is captured using spot microphones. Afterward, it is projected at the remote end using spatialization software based on virtual microphone control (ViMiC) and an array of loudspeakers. In order to simulate the same virtual room at all co-located sites, the ViMiC systems communicate using the OpenSound Control protocol to exchange room parameters and the room coordinates of the musicians.
Convention Paper 7209 (Purchase now)
P8-5 A Tutorial: Fiber Optic Cables and Connectors for Pro-Audio—Ronald Ajemian, Owl Fiber Optics - Flushing, NY, USA
There have been many technological breakthroughs in the area of fiber optic technology that have allowed an easier transition to migrate into the professional audio arena. Since the current rise of copper prices in the worldwide markets, there has been an increase of
usage in fiber optic based equipment, cables, and connectors deployed for pro-audio and video. This prompted the writing of this tutorial to bring the professional audio community up to date with some old and new fiber optic cables and connectors now being deployed in pro-audio. This tutorial will help audio professionals understand the jargon and to better understand fiber optic technology now being deployed in pro-audio.
Convention Paper 7210 (Purchase now)
P8-6 The Most Appropriate Method of Producing TV Program Audio Focusing on the Audience—Hisayuki Ohmata, NHK Science & Technical Research Laboratories - Tokyo, Japan; Akira Fukada, NHK Broadcasting Center - Tokyo, Japan; Hiroshi Kouchi, NHK Kofu Station - Kofu, Yamanashi, Japan
When audiences watch TV programs, they often perceive a difference in audio levels. This is a real annoyance for them, and it is caused by differences in program audio. In order to have equal audio levels, it is necessary to produce audio under the same conditions for all programs. To solve this problem, we propose a method to produce TV program audio. We make clear the manner in which different monitoring levels influence mixing balance at various mixing stages. This paper also describes management of audio levels for programs with different digital broadcasting head rooms.
Convention Paper 7211 (Purchase now)
P8-7 Beyond Splicing: Technical Ear Training Methods Derived from Digital Audio Editing Techniques—Jason Corey, University of Michigan - Ann Arbor, MI, USA
The process of digital audio editing, especially with classical or acoustic music using a source-destination method, offers an excellent opportunity for ear training. Music editing involves making transparent connections or splices between takes of a piece of music and often requires specifying precise edit locations by ear. The paper outlines how aspects of digital editing can be used systematically as an ear training method, even out of the context of an editing session. It describes a software tool that uses specific techniques from audio editing to create an effective ear training method that offers benefits that transfer beyond audio editing.
Convention Paper 7212 (Purchase now)
P8-8 New Trends in Sound Reinforcement Systems Based on Digital Technology—Piotr Kozlowski, Pawel Dziechcinski, Wroclaw University of Technology - Wroclaw, Poland; Wojciech Grzadziel, Pracownia Akustyczna, Acoustic Design Team - Wroclaw, Poland
This paper presents new aspects of modern sound reinforcement system’s designing that came into view because of the prevalence of digital technology. The basic structure of modern digital electro acoustical systems is explained using as an example the one installed at Wroclaw Opera House. This paper focuses on some aspects connected to digital transmission of audio signals, proper audience area sound coverage, achieving smooth frequency response, getting directive propagation at low frequencies, and controlling the system. Some measurement and tests about the topics presented in the paper have been done during the tuning of the system at Wroclaw Opera House. Achieved results prove that it is possible to acquire these targets.
Convention Paper 7213 (Purchase now)
P8-9 Using Audio Classifiers as a Mechanism for Content-Based Song Similarity—Benjamin Fields, Michael Casey, Goldsmiths College, University of London - London, UK
As collections of digital music become larger and more widespread, there is a growing need for assistance in a user's navigation and interaction with a collection and with the individual members of that collection. Examining pairwise song relationships and similarities, based upon content derived features, provides a useful tool to do so. This paper looks into a means of extending a song classification algorithm to provide song to song similarity information. In order to evaluate the effectiveness of this method, the similarity data is used to group the songs into k-means clusters. These clusters are then compared against the original genre sorting algorithm.
Convention Paper 7267 (Purchase now)
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