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Abstract-SocialSignal Processing is the research domain aimed at bridging the social intelligence gap between humans and machines. This article is the first survey of the domain that jointly considers its three major aspects, namely modeling, analysis and synthesis of social behaviour. Modeling investigates laws and principles underlying social interaction, analysis explores approaches for automatic understanding of social exchanges recorded with different sensors, and synthesis studies techniques for the generation of social behaviour via various forms of embodiment. For each of the above aspects, the paper includes an extensive survey of the literature, points to the most important publicly available resources, and outlines the most fundamental challenges ahead.

Types of absorber 11 2.2 Reverberation control 12 2.2.1 A statistical model of reverberation 17 2.3 Noise control in factories and large rooms with diffuse fields 20 2.4 Modal control in critical listening spaces 22 2.5 Echo control in auditoria and lecture theatresbasic sound propagation models 23 2.5.1 Sound propagation-a wave approach 24 2.5.2 Surface impedance, admittance, reflection coefficient, and absorption coefficient 25 2.6 Absorption in sound insulation-transfer matrix modelling 29 2.6.1 Transfer matrix modelling 29 2.7 Pipes, ducts, and silencers-porous absorber characteristics 31 2.7.1 Characterizing porous absorbers 32 2.8 Enclosures, barriers, and roads 33 2.9 Natural noise control 34 2.10 Hearing protection devices 35 2.11 Loudspeaker cabinets 36 2.12 Automotive absorbents and vehicle refinement 36 vii

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