Last Updated: 20050816, mei
P16 - Posters: Miscellaneous -2
Sunday, October 9, 3:00 pm — 4:30 pm
P16-1 A Binaural Model to Predict Position and Extension of Spatial Images Created with Standard Sound Recording Techniques—Jonas Braasch, McGill University - Montreal, Quebec, Canada
A binaural model was used to investigate different microphone techniques (Blumlein, ORTF, MS, spaced omni). In contrast to previous attempts, the model algorithm was not only designed to predict the position, but also the spatial extent, of a reproduced spatial image. The model also contains elements to simulate the precedence effect, which is required for analyzing spaced-microphone techniques, and is also useful when measuring the influence of the concert space on the recording.
Convention Paper 6610 (Purchase now)
P16-2 An Unsupervised Adaptive Filtering Approach of 2- to 5-Channel Upmix—Yan Li, Peter Driessen, University of Victoria - Victoria, British Columbia, Canada
A new algorithm of converting 2-channel audio materials to 5-channel based on subband unsupervised adaptive filtering is proposed in this paper. This algorithm uses a subband analysis-processing-synthesis framework. In each subband, a robust stereo image is obtained using principal component analysis, and an effective energy redistribution among surround channels is achieved by mapping cross-correlation between two input channels to a weighted panning matrix.
Convention Paper 6611 (Purchase now)
P16-3 Investigation on the Related Effect Caused by ECM Miniaturization—Jun Lee, Zonghan Wu, Zongbao Hu, Tao Zhang, Shenzhen Horn Electroacoustic Technology Co., Ltd. - Shenzhen, China
Miniaturization is a very important issue that people must keep in mind during design and production of electronic components. The miniaturization of ECM (electret condenser microphone) needs the corresponding changes of ECM structure, dimensions, and circuit distribution. Such changes impact on the specifications of ECM. This paper discusses the related effect of ECM miniaturization, which is useful for the design of mini-microphones.
Convention Paper 6612 (Purchase now)
P16-4 On Amplitude Panning and Asymmetric Loudspeaker Set-Ups—Arno van Leest, Philips Research Laboratories - Eindhoven, The Netherlands
The aim of amplitude panning is to create a phantom sound source that is heard at a certain predetermined position by feeding a mono signal to several loudspeakers using particular weighting factors. Two models used for amplitude panning are of particular importance: the velocity and the energy model. A nice property of these models is that the position of a phantom sound source can be described as linear combinations of the vectors pointing toward the physical positions of the loudspeakers. In this paper we describe how the coefficients of these linear combinations can be numerically computed by means of simple matrix algebra, which meet both the velocity and the energy model simultaneously for a given optimization criterion.
Convention Paper 6613 (Purchase now)
P16-5 Phantom Audio Sources with Vertically Separated Loudspeakers—Shiva Sundaram, Chris Kyriakakis, University of Southern California - Los Angeles, CA, USA
Multichannel auditory displays and immersive audio systems are frequently integrated with video displays. Often in these applications, the video display placement makes it difficult to place the center loudspeaker in front of the listener. A solution to this problem is to create a phantom center channel in front of the listener using loudspeakers placed elsewhere. Conventionally, phantom sources can be created by amplitude-panned techniques in the horizontal plane. However, since it is practical and aesthetic to have loudspeakers above or below the video display, in this paper, we propose a technique to create a center phantom at 0 degrees elevation and 0 degrees azimuth to the listener using two vertically separated loudspeakers placed above and below the horizontal plane at 0 degrees azimuth. The phantom center is created using inverse filtering techniques. This technique can also be extended to create phantom sources in the median plane.
Convention Paper 6614 (Purchase now)
P16-6 Difference of the Sound Levels among 15 Japanese Terrestrial and Digital Satellite TV Broadcasting Channels—Eiichi Miyasaka, Takahiro Kamada, Musashi Institute of Technology - Yokohama, Kanagawa, Japan
Toward better sound services for elderly listeners, we investigated, for the first time, the sound levels of 15 Japanese terrestrial analog broadcasting channels and digital broadcasting channels including NHK and the Commercial Broadcasting Bureaus. The results show that (1) the daily averaged sound level of the terrestrial channels was –6.1 dB with 4 dB higher than that of BS digital channels, (2) the maximum level difference of the averaged sound levels between main programs and advertisements inserted in the programs was 15 dB, and (3) the average level difference was 2.9 dB. These results imply that there exist perceptually significant problems for elderly viewers.
Convention Paper 6615 (Purchase now)
P16-7 Electroacoustic Analogy Analysis of Electret Condenser Microphones with Noise-Canceling Effects—Fang-Ching Lee, Industrial Technology Research Institute - Hsinchu, Taiwan
An electroacoustic analogy is developed to analyze the open-circuit sensitivity, noise-canceling effect, and frequency response of electret condenser microphones. In contrast to conventional models of electret condenser microphones in the literature, the present electroacoustic analogy analysis (E.A.A.) model details the open-circuit sensitivity, noise-canceling effect and frequency response of microphones. Two commercially available electret condenser microphones are analyzed to demonstrate the model. The results show that the calculating results of discussed microphones consist with the measuring data.
Convention Paper 6616 (Purchase now)