| President’s Message (PDF-102KB) Jim Anderson | 771 |
| PAPERS | |
| Low-Frequency Loudspeaker–Room Simulation Using Finite Differences in the Time Domain—Part 1: Analysis (PDF-1.2MB) (HI-RES PDF-16.4MB) | |
| Adrian Celestinos and Sofus Birkedal Nielsen | 772 |
| A computer simulation using finite-difference time-domain techniques has been used to model the low-frequency transfer function between a loudspeaker and virtual microphones in a rectangular room. The model for the analysis was validated with measurements in an IEC standard listening space. Using the mean sound field deviation, the cumulative spectral energy decay, and the clarity metric, the properties of a sample room can be examined mathematically and visually. At frequencies between 30 and 100 Hz, sound pressure varies as much as 30 dB from one position to another. | |
| Adaptive RD Optimized Hybrid Sound Coding (PDF-1.2MB) (HI-RES PDF-7.8MB) | |
| Nicolle H. van Schijndel, Julien Bensa, Mads G. Christensen, Catherine Colomes, Bernd Edler, Richard Heusdens, Jesper Jensen, Søren Holdt Jensen, W. Bastiaan Kleijn, Valery Kot, Balázs Kövesi, Jonas Lindblom, Dominique Massaloux, Omar A. Niamut, Fredrik Nordén, Jan H. Plasberg, Renat Vafin, Steven van de Par, David Virette, and Oliver Wübbolt | 787 |
| Rather than select a single type of codec optimized for a particular application, the authors propose a generic sound-coding technology that combines a range of different coding algorithms based on the current properties of the audio and the channel constraints. Rate-distortion optimization is a promising method for such a framework. Subjective listening tests show the advantages of this kind of flexibility in such applications as Internet radio, portable storage, and mobile communications. Bit allocation is not fixed but flexible, which allows for adaptation to time-varying inputs and changing channel properties. | |
| Modifying the Directional Responses of a Coincident Pair of Microphones by Postprocessing (PDF-470KB) (HI-RES PDF-5.8MB) | |
| Christof Faller | 810 |
| By means of time–frequency signal processing, the effective directional response of stereo coincident microphones can be altered. This allows the spaciousness of the recording to be controlled without the use of artificial reverberation and with good localization. Effectively, the algorithm reduces the overlapping region of the microphone responses. Subjective testing shows that audio quality is very high and cardioid coincident stereo recordings are improved. Rear sound is rejected and the two signals remain in phase. | |
| Corpuscular Streaming and Parametric Modification Paradigm for Spatial Audio Teleconferencing (PDF-1.1MB) (HI-RES PDF-11.5MB) | |
| B. St. James and M. O. J. Hawksford | 823 |
| This paper presents a new paradigm for spatial audio teleconferencing that exploits the corpuscular nature of general audio parametric coding for low bit-rate audio compression. The paradigm consists of several processing tools. The spatial aspect is enacted by a dynamic rendition tool that optimizes placement of speech sources within the soundscape; the temporal aspects of a phoneme protection tool misalign corruptive and vulnerable speech elements in a multitalking environment. A novel means of echo suppression eliminates the need for adaptive filtering and real-time echo cancellation, which is difficult for multichannel audio. | |
| CORRECTIONS | |
| Correction to “Binaural Loudness for Artificial-Head Measurements in Directional Sound Fields” | |
| V. P. Sivonen and W. Ellermeier (PDF-36KB) | 844 |
| STANDARDS AND INFORMATION DOCUMENTS | |
| AES Standards Committee News (PDF-75KB) | 845 |
| AESSC progress report; audio networks; cable shields; loudspeaker polar radiation; digital interface for loudspeakers; audio metadata | |
| FEATURES | |
| 34th Conference Report, Jeju Island (PDF-4.0MB) | 850 |
| Let the Games Be Mobile (PDF-480KB) Francis Rumsey | 862 |
| New Officers 2008/2009 (PDF-164KB) | 866 |
| Review of Society’s Sustaining Members (PDF-683KB) | 870 |
| 126th Convention, Munich, Call for Papers (PDF-112KB) | 896 |
| 37th Conference, Denmark, Call for Papers (PDF-88KB) | 897 |
| Call for Nominations for the Board of Governors (PDF-41KB) | 898 |
| Call for Awards Nominations (PDF-55KB) | 899 |
| Bylaws: Audio Engineering Society, Inc. (PDF-89KB) | 900 |
| DEPARTMENTS | |
| Reviews of Acoustical Patents (PDF-346KB) | 847 |
| Upcoming Meetings (PDF-64KB) | 869 |
| News of the Sections (PDF-221KB) | 886 |
| Sound Track (PDF-64KB) | 890 |
| New Products and Developments (PDF-70KB) | 891 |
| Membership Information (PDF-208KB) | 892 |
| Advertiser Internet Directory (PDF-166KB) | 893 |
| In Memoriam (PDF-108KB) | 895 |
| Sections Contacts Directory (PDF-178KB) | 904 |
| AES Conventions and Conferences (PDF-114KB) | 912 |
| EXTRAS | |
| Cover & Sustaining Members List (PDF-101KB) | |
| AES Officers, Committees, Offices & Journal Staff (PDF-77KB) | |
| Advertisements (PDF-4.5MB) | |
