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AES Munich 2009
Poster Session P18

Saturday, May 9, 10:30 — 12:00

P18 - Assessment, Evaluation

P18-1 WhisPER—A New Tool for Performing Listening TestsSimon Ciba, André Wlodarski, Hans-Joachim Maempel, Technical University of Berlin - Berlin, Germany
A software tool is presented for performing experiments in the field of perceptual audio evaluation and psychoacoustic measurement, controlling the interaction with both the subject and the playback environment. For this purpose a repertoire of test procedures has been implemented, including popular qualitative and quantitative approaches. By using OpenSound Control commands, not only traditional multichannel reproduction is supported, but also advanced spatial audio reproduction such as dynamic binaural synthesis or wavefield synthesis. WhisPER has been written in MATLAB to facilitate its further development within the scientific community. As opposed to existing libraries it provides a coherent graphical user interface system allowing easier access and configuration also for users without advanced programming experience.
Convention Paper 7749 (Purchase now)

P18-2 Psychoacoustic Assessment of the Noise Emitted by the Machines. The Case of the GrindersMarcos D. Fernández, José Antonio Ballesteros, Iván Suárez; Samuel Quintana; Isabel González, Escuela Universitaria Politécnica de Cuenca, Universidad de Castilla-La Mancha - Cuenca, Spain
Sound quality it is used as the suitability of the sound emitted by a machine, depending on the characteristics of that sound and the perceptual sensation received that reflects the degree of acceptance of the machine by the user. In order to evaluate the sound quality of the grinders under study, binaural recordings, are required of the emitted sounds to determine the objective psychoacoustic parameters, and then, to make subjective tests to a representative number of people about the impression made by that particular sound.
Convention Paper 7750 (Purchase now)

P18-3 Investigations of the Effects of Nonlinear Distortions on Psychoacoustical MeasuresStephan Herzog, Technical University Kaiserslautern - Kaiserslautern, Germany
The perception of nonlinear distortions of audio devices, in particular the perception of nonlinear distortions of digital audio, is only insufficiently described by typical measures like THD. To provide a better insight into perceptual effects of nonlinear distortions, their audibility, and the impact on the psychoacoustical measures like loudness and sharpness is examined. For this purpose a test method has been developed. The first step in the test is the measurement of the frequency response of the device under test with an efficient method to enable the separation of linear and nonlinear processing. The second step of the test consists of the computation of the psychoacoustical measures and the thresholds for the audibility of nonlinear distortions. Both computations are based on the same psychoacoustical model to obtain consistent results. Results for several types of distortion obtained with simulations and measurements on analog circuits are presented.
Convention Paper 7751 (Purchase now)