Download From Joint Stereo to Spatial Audio Coding - Recent Progress and Standardization Within the evolution of perceptual audio coding, there is a long history of exploiting techniques for joint coding of several audio channels of an audio program which are presented simultaneously. The paper describes how such techniques have progressed over time into the recent concept of spatial audio coding, as it is under standardization currently within the ISO/MPEG group. As a significant improvement over conventional techniques, this approach allows the representation of high quality multi-channel audio at bitrates of only 64kbit/s and below.
Download Assessing Applause Density Perception Using Synthesized Layered Applause Signals Applause signals are the sound of many persons gathered in one place clapping their hands and are a prominent part of live music recordings. Usually, applause signals are recorded together or alongside with the live performance and serve to evoke the feeling of participation in a real event within the playback recipient. Applause signals can be very different in character, depending on the audience size, location, event type, and many other factors. To characterize different types of applause signals, the attribute of ‘density’ appears to be suitable. This paper reports first investigations whether density is an adequate perceptual attribute to describe different types of applause. We describe the design of a listening test assessing density and the synthesis of suitable, strictly controlled stimuli for the test. Finally, we provide results, both on strictly controlled and on naturally recorded stimuli, that confirm the suitability of the attribute density to describe important aspects of the perception of different applause signal characteristics.