| PAPERS | |
| Long Interpolation of Audio Signals Using Linear Prediction in Sinusoidal Modeling (PDF-557KB) | |
| Mathieu Lagrange, Sylvain Marchand, and Jean-Bernard Rault | 891 |
| A new synthesis technique, based on linear prediction of sinusoidal parameters, is proposed as a means to interpolate missing audio in gaps lasting as long as one second. Recreated musical partials include the expected vibrato and tremolo, thereby creating a natural sound for complex polyphonic signals. This parametric approach is an improvement over the more common methods of sinusoidal and temporal interpolation. Subjects judged the result as being a higher quality. | |
| Development and Evaluation of a Model for Predicting the Audibility of Time-Varying Sounds in the Presence of Background Sounds (PDF-220KB) | |
| Brian R. Glasberg and Brian C. J. Moore | 906 |
| A model for predicting the audibility of a target signal in the presence of a noisy background can be applied to many stimuli, such as announcement signals in aircraft or trains and ring tones of mobile telephones in urban environments. Rather than using a model that assumes steady state, this study considers time-varying signals and background sounds, which have more applications to real situations. However, the complexity of informational masking makes the problem more difficult. | |
| Directional Resolution of Head-Related Transfer Functions Required in Binaural Synthesis (PDF-432KB) | |
| Pauli Minnaar, Jan Plogsties, and Flemming Christensen | 919 |
| When a signal recorded in an anechoic environment is convolved with a pair of head-related transfer functions (HRTFs), the listener experiences a sound source in a virtual space. An infinite number of HRTFs are needed to represent all possible locations. Interpolation among a limited number of HRTFs greatly reduces the need for a complete set, but such an approach assumes knowledge of the spatial resolution of the set and the accuracy of the resulting interpolation. In this study the spatial resolution of the basis set was determined to produce interpolated results that were subjectively identical to actual HRTFs. | |
| New Type of Acoustic Filter Using Periodic Polymer Layers for Measuring Audio Signal Components Excited by Amplitude-Modulated High-Intensity Ultrasonic Waves (PDF-521KB) | |
| Minoru Toda | 930 |
| Because of nonlinearity in acoustic wave propagation, audio frequencies can be generated by strong ultrasonic signals. For example, two signals closely spaced in frequency create an audio signal at the difference frequency as if air were a demodulator. Measuring these demodulation products is difficult because the nonlinearity of microphones also produces similar signals. A new type of acoustic filter using periodic polymer layers greatly reduced the influence of the microphone by providing an acoustic low-pass function. In this paper a detailed theory for multilayer films as a filter confirms the approach. | |
| STANDARDS AND INFORMATION DOCUMENTS | |
| AES Standards Committee News (PDF-123KB) | 942 |
| Tape care and handling; audio preservation and restoration; library and archive systems; audio metadata; audio connectors | |
| FEATURES | |
| Program Loudness Revisited (PDF-625KB) | 945 |
| The Evolving World of Film Sound (PDF-222KB) | 951 |
| New Officers 2005/2006 (PDF-228KB) | 954 |
| Review of Society's Sustaining Members (PDF-414KB) | 958 |
| 120th Convention, Paris, Call for Papers (PDF-75KB) | 992 |
| DEPARTMENTS | |
| News of the Sections (PDF-185KB) | 978 |
| Sound Track (PDF-185KB) | 982 |
| New Products and Developments (PDF-184KB) | 983 |
| Available Literature (PDF-184KB) | 984 |
| Upcoming Meetings (PDF-184KB) | 985 |
| Membership Information (PDF-301KB) | 986 |
| Advertiser Internet Directory (PDF-309KB) | 989 |
| In Memoriam (PDF-309KB) | 991 |
| Sections Contacts Directory (PDF-123KB) | 993 |
| AES Conventions and Conferences (PDF-197KB) | 1000 |
| EXTRAS | |
| Cover & Sustaining Members List (PDF-133KB) | |
| AES Officers, Committees, Offices & Journal Staff (PDF-97KB) | |
