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Recently, technologies for parametric coding of multi-channel audio signals have received wide attention under the name of " Spatial Audio Coding. " In contrast to a fully discrete representation of multi-channel sound, these techniques allow for a backward compatible transmission at bitrates only slightly higher than rates commonly used for mono / stereo(More)
This article provides a compact overview of the history, technology, and performance of MPEG Surround. The technology of MPEG Surround is based on the spatial audio coding (SAC) principle: In the encoder, a mono- or stereophonic down- mix is generated from the multichannel input signal, and additional parametric side information is extracted to guide the(More)
We propose algorithms significantly extending the limits for maintaining exact representations in the verification of linear hybrid systems with large discrete state spaces. We use AND-Inverter Graphs (AIGs) extended with linear constraints (LinAIGs) as symbolic representation of the hybrid state space, and show how methods for maintaining compactness of(More)
We present a method which computes optimized representations for non-convex polyhedra. Our method detects so-called redundant linear constraints in these representations by using an incremental SMT (Satisfiability Modulo Theories) solver and then removes the redundant constraints based on Craig interpolation. The approach is motivated by applications in the(More)
In this paper we present a complete method for verifying properties expressed in the temporal logic CTL. In contrast to the majority of verification methods presented in previous years, we support unbounded model checking based on symbolic representations of characteristic functions. Among others, our method is based on an advanced and-inverter graph (AIG)(More)
We address the problem of model checking hybrid systems which exhibit nontrivial discrete behavior and thus cannot be treated by considering the discrete states one by one, as most currently available verification tools do. Our procedure relies on a deep integration of several techniques and tools. An extension of AND-Inverter-Graphs (AIGs) with first-order(More)
Combinational equivalence checking is an essential task in circuit design. In this paper we focus on SAT based equivalence checking making use of incremental SAT techniques which are well known from their application in bounded model checking. Based on an analysis of shared circuit structures we present heuristics which try to maximize the benefit from(More)
Recently, a new approach in low bitrate coding of stereo and multi-channel audio has emerged: Spatial audio coding permits an efficient representation of multi-channel audio signals by transmitting a downmix signal along with some compact spatial side information describing the most salient properties of the multi-channel sound image. Besides its impressive(More)
In this paper we present a complete method for verifying properties expressed in the temporal logic CTL. In contrast to the majority of verification methods presented in recent years, we support unbounded model checking based on symbolic representations of characteristic functions. Among others, our method is based on an advanced And-Inverter Graph (AIG)(More)