Pere Artís

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Parametric loudspeakers are often used in beam forming applications where a high directivity is required. Withal, in this paper it is proposed to use such devices to build an omnidirectional source of sound. An initial prototype, the omnidirectional parametric loudspeaker (OPL), consisting of a sphere with hundreds of ultrasonic transducers placed on it has(More)
  • P Artis
  • La Psychiatrie de l'enfant
  • 1994
Based on his experience as psychopedagogue in a special education facility for adolescents with psychopathological disturbances, the author develops the idea that the learning difficulties cannot be reduced to intellectual deficits due to constitutional causes or traumatic experiences. The observation and analysis of the difficulties suggest that(More)
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