Monday, May 22, 15:00 — 18:00 (Gallery Window Area 2)
EB07-01 Establishing the Performance of a DIY Tapped Horn Subwoofer
Andy Wardle (Presenting Author)
A DIY Tapped Horn subwoofer was constructed and driven using modestly priced hardware. The position of the acoustic center, frequency and polar responses were established under pseudo-free field conditions. Polar responses and results were compared to a commercially available device. The DIY product performed comparatively poorly with respect to amplitude and frequency response but displayed comparable polar response. Very low frequencies (<80 Hz) displayed no directionality, with effective pattern control beginning at 100 Hz in line with the cutoff frequency predicted by its mouth area. It was established that if processed appropriately, multiple units would provide additional SPL and lower the frequency of pattern control providing a viable alternative to more expensive products for small to medium scale outdoor events.
Engineering Brief 341
EB07-02 The Influence of the Passive Electronic Components Quality on the Electroacoustic Parameters of the Audio Devices
Maciej Sabiniok (Presenting Author)
A large group of young and inexperienced electronics engineers interested in building audio devices asked how the quality of the passive components such as resistors and capacitors affected on the electroacoustic parameters of designed circuits. This group also includes students who are the members of the Polish Student Section of the Audio Engineering Society at Wroclaw University of Science and Technology willing to work with audio electronics and obtain the best possible quality of the constructed equipment. The aim of this paper is to investigate the impact of the varying passive components quality into the audio circuits performance. The results will allow students to know the limitations related to the choice of passive components.
Engineering Brief 342
EB07-03 Design of a Digitally Controlled Graphic Equalizer
Marcelo Herrera Martinez (Presenting Author), Carlos Mauricio Betancur Vargas (Author), Jonnathan Montenegro Niño (Author), Dario Alfonso Páez Soto (Author), Vladimir Trujillo Olaya (Author)
This article deals with the design of a digitally audio controller for use in general applications. The goal is to create a 10-band graphic equalizer of which the signal gain or attenuation in every octave band is controllable by a smartphone /tablet application. The application provides a user interface to enhance perceptive audio quality intuitively. Making the equalizer digitally controllable by an app eliminates the necessity of manually adjusting the equalizer faders, thus the need of the presence of a musician/engineer at the location of the equalizer is removed. Preset configurations are easily activated in the equalizer hardware with only one touch within the app. Further testing and optimization efforts are required for the validation of the system.
Engineering Brief 343
EB07-04 Design of an Algorithm for VST Audio Mixing Based on Gibson Diagrams
Marcelo Herrera Martinez (Presenting Author), Belman Jahir Rodriguez Nino (Author)
This project consists on the creation of a plugin on the Ableton Live platform, with the aim of providing visually the audio mixing process in real-time. The software programming is developed on Max for Live–a program to establish the link between Max Msp and Ableton Live. The plugin is assigned for each channel with the aim of visualizing the correspondent sound to a “sphere“ object on a 3D window and there to observe the variations in real time of loudness, panning, and frequency analysis based on David Gibson´s interpretation in his book The Art of Mixing.
Engineering Brief 344