title: Full 2-port vector-corrected network analyzer in the acoustic domain

authors: MacDonell, Marcus Scott Glengarry

abstract: This manuscript presents the theory and design of a Vector-corrected Network Analyzer (VNA) realized in the acoustic domain. This is a novel measurement instrument based on the established microwave vector network analyzer. It employs directional couplers to separate forward and reverse traveling waves in acoustic waveguide. This instrument is intended to supersede the acoustic impedance tube. Advantages include greatly increased measurement speed and potential for traceability to external standards. Traceability is achieved by means of a calibration through an analytical solution of the error matrix produced from the measurement of a limited number of available acoustic standards. Operation is verified through analysis of the acoustic S-parameters of a passive, asymmetrical, reciprocal acoustic device constructed inside the acoustic waveguide. To the best of our knowledge this Acoustic Vector-corrected Network Analyzer (AVNA) is the first of its kind.

text: Full 2-port vector-corrected network analyzer in the acoustic domain This manuscript presents the theory and design of a Vector-corrected Network Analyzer (VNA) realized in the acoustic domain. This is a novel measurement instrument based on the established microwave vector network analyzer. It employs directional couplers to separate forward and reverse traveling waves in acoustic waveguide. This instrument is intended to supersede the acoustic impedance tube. Advantages include greatly increased measurement speed and potential for traceability to external standards. Traceability is achieved by means of a calibration through an analytical solution of the error matrix produced from the measurement of a limited number of available acoustic standards. Operation is verified through analysis of the acoustic S-parameters of a passive, asymmetrical, reciprocal acoustic device constructed inside the acoustic waveguide. To the best of our knowledge this Acoustic Vector-corrected Network Analyzer (AVNA) is the first of its kind.

year: 2022

title: Renegotiating the terms of engagement: Public relations, marketing, and contemporary challenges

authors: McKie, David

subjects: Complexity

abstract: Territorial disputes between public relations and marketing are nothing new. At the end of the first decade of the 21st century, Hutton (2010) refocused them as a matter of survival in the face of marketing attempts "to include or subsume much or all of public relations" (p. 509). In addition to aligning with his call to resist marketing imperialism, this article seeks to renegotiate traditional turf wars between the two fields through a review of recent significant marketing books. Advocating a complexity-based perspective, it argues that evolving disciplines, like evolving species, need to respond not only to each other but also to the wider environment and that requires cooperation as well as competition. It also draws on complexity thinking as a resource for improving disciplinary intersections and for adapting to the uncertain and turbulent conditions of the present.

text: Renegotiating the terms of engagement: Public relations, marketing, and contemporary challenges Territorial disputes between public relations and marketing are nothing new. At the end of the first decade of the 21st century, Hutton (2010) refocused them as a matter of survival in the face of marketing attempts "to include or subsume much or all of public relations" (p. 509). In addition to aligning with his call to resist marketing imperialism, this article seeks to renegotiate traditional turf wars between the two fields through a review of recent significant marketing books. Advocating a complexity-based perspective, it argues that evolving disciplines, like evolving species, need to respond not only to each other but also to the wider environment and that requires cooperation as well as competition. It also draws on complexity thinking as a resource for improving disciplinary intersections and for adapting to the uncertain and turbulent conditions of the present.

year: 2012

title: Technology, culture and location in a recent New Zealand sonic art project

authors: Whalley, Ian

subjects: music

abstract: The HIEMPA (Hybrid Instruments from Electroacoustic Manipulation And Models of Pütorino and Aquascape) project combined a team of people with technical, artistic, environmental and cultural expertise toward the artistic outcome of extending the New Zealand sonic art tradition. The project involved collecting audio samples from the aquascape of the Ruakuri Caves and Nature Reserve in Waitomo, South Waikato, New Zealand; and samples of a variety of Pütorino – a New Zealand Mäori wind instrument. Following a machine learning analysis of this audio material and an analysis of the performance material, hybrid digital instruments were built and mapped to suitable hardware triggers. The new instruments are playable in real-time, along with the electroacoustic manipulation of Pütorino performances. The project takes into account the environmental and cultural significance of the source material, with the results to be released as a set of compositions. This paper discusses the research process.

text: Technology, culture and location in a recent New Zealand sonic art project The HIEMPA (Hybrid Instruments from Electroacoustic Manipulation And Models of Pütorino and Aquascape) project combined a team of people with technical, artistic, environmental and cultural expertise toward the artistic outcome of extending the New Zealand sonic art tradition. The project involved collecting audio samples from the aquascape of the Ruakuri Caves and Nature Reserve in Waitomo, South Waikato, New Zealand; and samples of a variety of Pütorino – a New Zealand Mäori wind instrument. Following a machine learning analysis of this audio material and an analysis of the performance material, hybrid digital instruments were built and mapped to suitable hardware triggers. The new instruments are playable in real-time, along with the electroacoustic manipulation of Pütorino performances. The project takes into account the environmental and cultural significance of the source material, with the results to be released as a set of compositions. This paper discusses the research process.

year: 2008