Japan A simulator is proposed to examine detection threshold of the distortion due to time jitter. Signals with artificial time jitter are simulated on digital data using over-sampling, interpolation, and decimation. With this method, quantitatively controlled distortion is added to musical signals and the signals can be presented to human subjects through a conventional DA converter. The amount of the distortion hardly depends on the equipment. We are examining detection threshold of time jitter.
Preliminary results show that some subjects can detect jitter of several hundreds nanoseconds.
In order to accommodate head movement, it is possible to design 3D sound systems that continuously select appropriate virtual audio filters that correspond to a listener s varying head position. The required spatial resolution of the audio filters depends on the size of the sweet spot. Here the size of the sweet spot of a two speaker 3D audio system is evaluated subjectively at symmetric and asymmetric head locations.