The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
O. Mccarthy - One of the best experts on this subject based on the ideXlab platform.
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a 20 w stereo class d Audio Output power stage in 0 6 spl mu m bcdmos technology
IEEE Journal of Solid-state Circuits, 2004Co-Authors: P. Morrow, Eric Gaalaas, O. MccarthyAbstract:This paper presents a highly power efficient 2/spl times/20-W class-D Audio Output power stage implemented in 0.6-/spl mu/m BCDMOS technology. The presented power stage is capable of driving 2/spl times/8-/spl Omega/ loads from a 20-V power supply at a power efficiency approaching 90%. Circuit details of thermal detection, over-current protection, and startup speaker click/pop are also presented. The performance of open-loop Class-D Output stages are limited by the distortion mechanisms present within the power stage itself. A third-order PWM modulator was prototyped and used to dramatically improve the performance of the Class-D Output stage by using feedback. The results of this work are also presented.
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A 20-W stereo class-D Audio Output power stage in 0.6-/spl mu/m BCDMOS technology
IEEE Journal of Solid-State Circuits, 2004Co-Authors: P. Morrow, Eric Gaalaas, O. MccarthyAbstract:This paper presents a highly power efficient 2/spl times/20-W class-D Audio Output power stage implemented in 0.6-/spl mu/m BCDMOS technology. The presented power stage is capable of driving 2/spl times/8-/spl Omega/ loads from a 20-V power supply at a power efficiency approaching 90%. Circuit details of thermal detection, over-current protection, and startup speaker click/pop are also presented. The performance of open-loop Class-D Output stages are limited by the distortion mechanisms present within the power stage itself. A third-order PWM modulator was prototyped and used to dramatically improve the performance of the Class-D Output stage by using feedback. The results of this work are also presented.
Wolfgang Straßer - One of the best experts on this subject based on the ideXlab platform.
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Tangoscope: A Tangible Audio Device for Tabletop Interaction
2017Co-Authors: Jörg Edelmann, Yvonne Kammerer, Birgit Imhof, Peter Gerjets, Wolfgang StraßerAbstract:Tabletop installations allow multiple users to playback digital media simultaneously. With public speakers, however, simultaneous auditory content gets superimposed, leading to a confusing and disturbing user experience. In this paper, we present Tangoscope, a tangible Audio Output device for tabletop interaction. As we augmented headphones with a visual marker-based identification mechanism, with the Tangoscope each user is provided with individual auditory content. To allow for an instruction-free and intuitive usage of the Audio device we employed the metaphor of a real stethoscope. A first user study indicated the self-explaining use of the Tangoscope.
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INTERACT (3) - Tangoscope: a tangible Audio device for tabletop interaction
Human-Computer Interaction – INTERACT 2011, 2011Co-Authors: Jörg Edelmann, Yvonne Kammerer, Birgit Imhof, Peter Gerjets, Wolfgang StraßerAbstract:Tabletop installations allow multiple users to playback digital media simultaneously. With public speakers, however, simultaneous auditory content gets superimposed, leading to a confusing and disturbing user experience. In this paper, we present Tangoscope, a tangible Audio Output device for tabletop interaction. As we augmented headphones with a visual marker-based identification mechanism, with the Tangoscope each user is provided with individual auditory content. To allow for an instruction-free and intuitive usage of the Audio device we employed the metaphor of a real stethoscope. A first user study indicated the self-explaining use of the Tangoscope.
P. Morrow - One of the best experts on this subject based on the ideXlab platform.
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a 20 w stereo class d Audio Output power stage in 0 6 spl mu m bcdmos technology
IEEE Journal of Solid-state Circuits, 2004Co-Authors: P. Morrow, Eric Gaalaas, O. MccarthyAbstract:This paper presents a highly power efficient 2/spl times/20-W class-D Audio Output power stage implemented in 0.6-/spl mu/m BCDMOS technology. The presented power stage is capable of driving 2/spl times/8-/spl Omega/ loads from a 20-V power supply at a power efficiency approaching 90%. Circuit details of thermal detection, over-current protection, and startup speaker click/pop are also presented. The performance of open-loop Class-D Output stages are limited by the distortion mechanisms present within the power stage itself. A third-order PWM modulator was prototyped and used to dramatically improve the performance of the Class-D Output stage by using feedback. The results of this work are also presented.
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A 20-W stereo class-D Audio Output power stage in 0.6-/spl mu/m BCDMOS technology
IEEE Journal of Solid-State Circuits, 2004Co-Authors: P. Morrow, Eric Gaalaas, O. MccarthyAbstract:This paper presents a highly power efficient 2/spl times/20-W class-D Audio Output power stage implemented in 0.6-/spl mu/m BCDMOS technology. The presented power stage is capable of driving 2/spl times/8-/spl Omega/ loads from a 20-V power supply at a power efficiency approaching 90%. Circuit details of thermal detection, over-current protection, and startup speaker click/pop are also presented. The performance of open-loop Class-D Output stages are limited by the distortion mechanisms present within the power stage itself. A third-order PWM modulator was prototyped and used to dramatically improve the performance of the Class-D Output stage by using feedback. The results of this work are also presented.
Mohan S Kankanhalli - One of the best experts on this subject based on the ideXlab platform.
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Progressive Audio Scrambling in Compressed Domain
IEEE Transactions on Multimedia, 2008Co-Authors: Wei-gang Fu, Mohan S KankanhalliAbstract:Audio scrambling can be employed to ensure confidentiality in Audio distribution. We first describe scrambling for raw Audio using the discrete wavelet transform (DWT) first and then focus on MP3 Audio scrambling. We perform scrambling based on a set of keys which allows for a set of Audio Outputs having different qualities. During descrambling, the number of keys provided and the number of rounds of descrambling performed will decide the Audio Output quality. We also perform scrambling by using multiple keys on the MP3 Audio format. With a subset of keys, we can descramble to obtain a low quality Audio. However, we can obtain the original quality Audio by using all of the keys. Our experiments show that the proposed algorithms are effective, fast, simple to implement while providing flexible control over the progressive quality of the Audio Output. The security level provided by the scheme is sufficient for protecting MP3 music content.
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ISCAS (6) - Progressive scrambling for MP3 Audio
2005 IEEE International Symposium on Circuits and Systems, 1Co-Authors: Wei Qi Yan, Mohan S KankanhalliAbstract:Audio scrambling can be employed in Audio distribution for the purpose of guaranteeing the confidentiality. Electronic commerce in Audio products would be facilitated by the development of solutions which can ensure security/privacy, have efficiency in the compressed domain to reduce the bandwidth requirements, flexibility of implementing progressive Audio quality control and be computationally inexpensive for use in real-time systems. This paper proposes an effective progressive scrambling algorithm that works with MP3 Audio. We perform multiple-level scrambling based on keys to produce a set of Audio Outputs of differing qualities. During decoding, the keys provided, and rounds of descrambling performed, decide the quality of the Audio Output. Our experiments show that the proposed algorithm is effective, fast, simple to be implemented, and at the same time it does provide flexibility to control the quality of Audio Output progressively. We also present some experimental results to show its utility in real-time systems.
Jörg Edelmann - One of the best experts on this subject based on the ideXlab platform.
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INTERACT (3) - Tangoscope: a tangible Audio device for tabletop interaction
Human-Computer Interaction – INTERACT 2011, 2011Co-Authors: Jörg Edelmann, Yvonne Kammerer, Birgit Imhof, Peter Gerjets, Wolfgang StraßerAbstract:Tabletop installations allow multiple users to playback digital media simultaneously. With public speakers, however, simultaneous auditory content gets superimposed, leading to a confusing and disturbing user experience. In this paper, we present Tangoscope, a tangible Audio Output device for tabletop interaction. As we augmented headphones with a visual marker-based identification mechanism, with the Tangoscope each user is provided with individual auditory content. To allow for an instruction-free and intuitive usage of the Audio device we employed the metaphor of a real stethoscope. A first user study indicated the self-explaining use of the Tangoscope.
