AES New York 2013
Engineering Brief EB4
EB4 - Applications in Audio
Saturday, October 19, 11:30 am — 1:15 pm (Room 1E07)
David Romblom, McGill University - Montreal, Quebec, Canada; Centre for Interdisciplinary Research in Music Media and Technology (CIRMMT) - Montreal, Quebec, Canada
EB4-1 SyncAV—Workflow Tool for File-Based Video Shootings—Andreas Fitza, University of Applied Science Mainz - Mainz, Germany
The Sync-AV workflow tool eases the sorting and synchronization of video and audio footage without the need for expensive special hardware. It supports pre-production, shooting and post-production. It consists of these elements: a script-information and metadata-gathering web app that’s connected to a server database; a local import client that manages the footage ingest and sorts the files together; the client also takes care of the synchronization of the video that contains audio and separately recorded audio files and it renames the files and implements the metadata; and the client uploads this synchronized preview files to our server so they can be shown at our web app. This e-Brief shows the current development and some specific solutions of Sync-AV.
Engineering Brief 118 (Download now)
EB4-2 Inconsistencies in the Practical Design and Measurement of Sound Systems in Reverberant Spaces Requiring a Minimum STI Standard—David McNutt, The McNutt Group - Chicago, IL, USA; Columbia College Chicago - Chicago, IL, USA
Minimum Speech Transmission Index measurement is now a requirement for Emergency Communication Systems as set forth in NFPA 72 2013 code. Professional audio design engineers have the greatest effect on potential intelligibility through their choice of the type, number, and distribution of loudspeakers and the power at which they are driven. Design Engineers often model sound systems for STI using EASE. Using this STI modeling approach can lead to varying results especially in reverberant sound fields. This brief discusses the conflicting results of three design/build projects in highly reverberant spaces in the Federal Plaza in Chicago.
Engineering Brief 119 (Download now)
EB4-3 The Advantages of Using Active Crossovers in High-End Wireless Speakers—David Jones, CSR Limited - Manchester, UK
With the availability of standardized wireless interfaces and high performance codecs, wireless speakers can be designed that suit the consumer demands of compactness and ease of use. This paper will examine the performance benefits of using active crossovers and digital equalization in an amplification subsystem based on a high performance digital input switching amplifier. Measurements of distortion and damping factors will be compared in an example signal chain and the influence these parameters have on the perceived audio quality of the speaker system will be discussed.
Engineering Brief 85 (Download now)
EB4-4 Low Latency Replacement of ISDN and 4-Wire for Remote Broadcasts—Anthony Faust, Atlantic Post Production - Toronto, ON, Canada; Netmondi
Integrated Services Digital Network (ISDN) lines are being replaced by other forms of Internet Protocol (IP) connectivity for high-quality remote broadcasts. In particular, the use of bonding diversity (diversity) over multiple public Internet networks for remote broadcasts has been proven in challenging environments with excellent results. This high-performance of this approach makes it likely to become the standard for remote broadcasts.
Engineering Brief 120 (Download now)
EB4-5 Design and Construction of the Stringer: A Polyphonic Signal Switcher for 13-pin DIN M—Michael Palumbo, Concordia University - Montreal, Quebec, Canada; Pouya Hamidi, McGill University - Montreal, QC, Canada; Richard King, McGill University - Montreal, Quebec, Canada; The Centre for Interdisciplinary Research in Music Media and Technology - Montreal, Quebec, Canada; Donald Pavlasek, McGill University - Montreal, Quebec, Canada
The Stringer is a polyphonic signal switcher for use with 13-pin DIN MIDI guitar pickups. Used as an intermediary between a guitar and a synthesizer pedal, the purpose of the device is to isolate a single string for monophony, such as bass note accompaniment. A height-and-depth-adjustable fulcrum bar supports the performer’s feet, and brings them closer to the foot switches, allowing for smoother and faster string switching. The current model can isolate strings 6, 5, and 4; mute all strings; and can run in bypass mode to pass all string signals through for standard operation. The circuit is powered by a 9V DC external adapter, and housed in a custom aluminum chassis.
Engineering Brief 121 (Download now)
EB4-6 Design of a Sound Reinforcement System for Koerner Hall—Jeffery Bamford, Engineering Harmonics Inc. - Toronto, ON, Canada
Built over three years, the 1,135-seat Koerner Hall is the jewel of the new TELUS Centre for Performance and Learning at the Royal Conservatory of Music in Toronto, Canada. Since its opening in September 2009, Koerner Hall's beautiful design, flexible performance characteristics and superb acoustics have been praised by critics and performers alike. The hall achieved the highest possible acoustic rating—N1—rendering it ideal for the finest acoustical performances of classical music, jazz, and world music. The incorporation of variable acoustics makes it equally well suited to amplified music, lectures, and film presentations. This Engineering Brief will review the process and design of the sound reinforcement system. It features an innovative and almost invisible 'voice-stick' to maximize intelligibility, rather than sound reinforcement. The system must provide coverage for the audience as to performers on and around the stage in an extremely intimate venue. Testing the design with a computer and mock-up will also be discussed.
Engineering Brief 122 (Download now)
EB4-7 Consistently Stable Loudspeaker Measurements Using a Tetrahedral Enclosure—Geoff Hill, Hill Acoustics Limited - Leigh on Sea, Essex, United Kingdom
A major problem for the loudspeaker and transducer industries throughout the world is an inability to rely upon measurements routinely exchanged between suppliers and customers. A system is proposed that offers a unique and stable test environment giving an opportunity to standardize and compare results between measurement sites. It works by having an enclosure shape that eliminates standing-waves and having acoustic foam to eliminate any remaining high frequencies. It then rigidly defines the measurement geometry together with interchangeable sub baffles, ensuring rapid and accurate change over and repeatable measurements. So that with several in use in the design, production and customer chain results will be comparable unit to unit throughout the world to an unprecedented degree.
Engineering Brief 123 (Download now)