Elettronica e Telecomunicazioni

Architectural acoustics - Setting up the interiors- Parte III
by Leonardo Scopece and Alberto Ciprian
To get a full acoustic treatment, you must place acoustic components. Often, however, you may choose the wrong type of equipment, obtaining a insufficient or unexpected effects. This is the last one of three articles on the acoustics; it deals with the description of the various component types, analyzing the pros and cons depending on the type of application. Often the best approach starts with a theoretical analysis, based on knowledge of the physical behavior of waves, the positioning of the elements and the verification of this analysis with practical applications. We analyze the surround, holophonic and ambisonic systems. In conclusion we consider some examples of real envirorments: the Rai Auditorium in Turin and the House of Sound at the University of Parma.

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		Cover	Contents	G.F. Barbieri Editorial
	Broadcasting of MPEG Surround Sound Services via Digital Radio by Paolo Casagranda andLeonardo Scopece This paper introduces multi-channel audio on digital radio. Multi-channel audio technology is briefly described, with special attention to its implementation on the DAB+ Digital Radio. Interoperability tests results are then reported, together with considerations about current European recommendations.
	3D - Virtual Microphone System - Highly Directive Probe by Leonardo Scopece, Angelo Farina and Andrea Capra The article describes the theory of the new microphone system for shooting and recording multi-channel sound and some practical application. The system is based on 32 capsules placed on a spherical probcan and sintetizes in real time up to 7 virtual microphones; their directivity (from an omni-directional mircrophone, to a standard cardioid one, up to a 6th order ultradirective one) and their spatial location can be dynamically chosen. A graphical interface allows their placement and movement on a video 360° image. The system is based on a new mathematical approach to the calculation of the matrix of FIR filters which are real-time convolved with the signals from the microphone capsules, the latency time is minimized thanks to a partitioned convolution processor.
	Architectural acoustics - Setting up the interiors- Parte III by Leonardo Scopece and Alberto Ciprian To get a full acoustic treatment, you must place acoustic components. Often, however, you may choose the wrong type of equipment, obtaining a insufficient or unexpected effects. This is the last one of three articles on the acoustics; it deals with the description of the various component types, analyzing the pros and cons depending on the type of application. Often the best approach starts with a theoretical analysis, based on knowledge of the physical behavior of waves, the positioning of the elements and the verification of this analysis with practical applications. We analyze the surround, holophonic and ambisonic systems. In conclusion we consider some examples of real envirorments: the Rai Auditorium in Turin and the House of Sound at the University of Parma.