1,721,961 research outputs found
Extension of the optimal source distribution for binaural sound reproduction
No full textBinaural reproduction over loudspeaker requires system inversion which is often referred to as cross-talk cancellation. Such process is the major factor to degrade the quality of 3D sound reproduction but the Optimal Source Distribution (OSD) provides simple and effective signal processing and loudspeaker design principle which enables lossless crosstalk cancellation process. The OSD takes advantage of its physical property which ensures that in-phase and out-of-phase components of the binaural reproduction process are balanced. Hence the bulk of the crosstalk cancellation is achieved by its loudspeaker design principle and the related natural interference in the sound field. Inverse filters of the OSD have a unique property where only the simple phase change is required in essence for the perfect crosstalk cancellation. Therefore, each filter has flat frequency response that lead to advantages in many respects. It is shown here that the advantage of the OSD is further enhanced by separating in-phase and out-of-phase components through an alternative system design
Subjective and objective evaluation of the Optimal Source Distribution for virtual acoustic imaging
No full textA recently proposed "OSD" system overcomes a number of problems, such as loss of dynamic range, deterioration in control performance by small errors and room reflections, which are often associated with binaural synthesis over loudspeakers, by means of a conceptual monopole transducer pair whose span varies as a function of frequency. This paper reports results of objective and subjective evaluation of the system
Optimal source distribution system for virtual acoustic imaging
No full textWhen binaural sound signals are presented with loudspeakers, the system inversion involved gives rise to a number of problems such as, for example, loss of dynamic range and a lack of robustness to small errors of control performance. These problems for such systems are investigated and this has resulted in the proposal of a new system, the Optimal Source Distribution ("OSD") system, which overcomes these problems by means of variable transducer span. A practical solution to realize a variable transducer span by discretization is also described. Several examples of the "OSD" system are demonstrated which in practice produce a very robust system over the whole audible frequency range. The relationship to the "Stereo Dipole" system is also described
Robustness to head misalignment of virtual sound imaging systems
No full textWhen binaural sound signals are presented with two loudspeakers, the listener's ears are required to be in the relatively small region which is under control of the system. Misalignment of the head results in inaccurate synthesis of the binaural signals. Consequently, directional information associated with the acoustic signals is inaccurately reproduced. When the two loudspeakers are placed close together, the spatial rate of change of the generated sound field is much smaller than that generated by two loudspeakers spaced apart. Therefore, the performance of such a system is expected to be more robust to misalignment of the listener's head. Robustness of performance is investigated here with respect to head displacement in three translational and three rotational directions. A comparison is given between systems consisting of two loudspeakers either placed close together or spaced apart. The extent of effective control with head displacement and the resulting deterioration in directional information is investigated in the temporal and spectral domain by analyzing synthesized binaural signals. Subjective localization experiments are performed for cases in which notable differences in performance are expected from the previous analysis. It is shown that the system comprising two loudspeakers that are close together is very robust to misalignment of the listener's head
Optimal source distribution for multiple listener virtual sound imaging
No full textWhen binaural sound signals are presented with loudspeakers, the system inversion involved gives rise to a number of problems such as, for example, loss of dynamic range and a lack of robustness to small errors of control performance. These problems for such systems are investigated and this has resulted in the proposal of a new system, the Optimal Source Distribution ("OSD") system, which overcomes these problems by means of variable transducer span. A practical solution to realize a variable transducer span by discretization is also described. Several examples of the "OSD" system are demonstrated which in practice produce a very robust system over the whole audible frequency range. The relationship to the "Stereo Dipole" system is also describe
Visual reinforcement audiometry with cross-talk cancellation. A feasibility study (Poster)
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