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2012 May - Volume 60 Number 5

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Papers

Directional Analysis with Microphone Array Mounted on Rigid Cylinder for Directional Audio Coding

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As a spatial-sound processing technique, directional audio coding can determine the direction of arrival of a sound wave. When based on a square array of four omnidirectional microphones, reliable estimation of direction is limited to a restricted frequency range. However, when a rigid cylinder is inserted into the array, the resulting acoustic shadows and scattering allow intermicrophone differences to be used in the quantization. Both methods estimate the direction reliably over the entire audible frequency range. Subjective listening tests corroborate the objective computations.


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The Assessment of Low-Frequency Room Acoustic Parameters Using Descriptive Analysis

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In small rooms, low-frequency modes have a degrading influence on the quality of the bass components of music. Using objective measures to correct these modes often fails because they do not correspond to the subjective experience of listeners. This research begins with a procedure that elicits a compact set of four verbal descriptors from subjects: articulation, resonance, strength, and depth. These are then mapped to three objective parameters: modal decay time, room volume, and source/receiver position. Results show the importance of reducing the decay time, which then provides an increase in articulation. Discussions suggest ways of extending the results.


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Subjective Preference of Modal Control Methods in Listening Rooms

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Methods to control the unwanted effects of low-frequency modes in critical listening rooms range from complex signal processing to the positioning of loudspeakers and listeners. A rigorous scientific experiment has been conducted to evaluate the perceived quality of eight low-frequency reproduction systems used to control the unwanted effects of room modes in a standard listening room. A strong correlation has been demonstrated between perceived improvements in quality and the decay times of low-frequency energy. For critical listening conditions, those systems ensuring a faster decay of low-frequency energy are preferred over those attempting to “flatten” the magnitude frequency response.


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An Improved Dissonance Measure Based on Auditory Memory

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Because dissonance is an important part of music analysis and psychoacoustic research, improving the model for predicting dissonance is useful. In this new model, musical events are assumed to reside in short-term memory, lasting on the range of 3 to 5 seconds. The total dissonance is the sum of the local dissonance from the new event and the interaction with elements in memory. In subjective tests with different kinds of music, the model with memory consistently better predicts listeners’ reports of dissonance. Dissonant sounds in music give rise to a physiological arousal response in listeners.


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Standards and Information Documents

AES Standards Committee News

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Audio connectors; digital audio measurement; digital audio interfaces; audio file transfer and exchange; audio applications of networks


Features

45th Conference Report, Helsinki

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Making Records in the 21st Century

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The art of making a living out of music production in the 21st century has changed beyond recognition compared with the situation thirty or forty years ago. AES workshops chaired by Nick Sansano and Jay LeBoeuf shed light on the business practices and technology that are behind the new generation of music production.


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49th Conference, London, Call for Papers

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50th Conference, Murfreesboro, Call for Papers

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Special Issue on Audio Networking, Call for Papers

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Departments

Section News Page: PDF (193KB)

Summary: Board of Governors’ Meeting Page: PDF (33KB)

Products and Developments Page: PDF (209KB)

Advertiser Internet Directory Page: PDF (103KB)

Sound Track Page: PDF (136KB)

Membership Information Page: PDF (55KB)

Section Contacts Directory Page: PDF (115KB)

AES Conventions and Conferences Page: PDF (65KB)

Extras

Table of Contents PDF (81KB)

Cover & Sustaining Members List PDF (72KB)

AES Officers, Committees, Offices & Journal Staff PDF (70KB)

 
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AES - Audio Engineering Society