Forming sequential objects (Stephen Smoliar )

Subject: Forming sequential objects
From:    Stephen Smoliar  <smoliar(at)ISS.NUS.SG>
Date:    Tue, 14 Sep 1993 22:02:52 -0400

Stephen McAdams writes: > >One of the important processes that gives rise to sequential objects >is segmentation. For a theoretical treatment of this in music, >see Lerdahl and Jackendoff's grouping preference rules. Notwithstanding Francesco Gimi's observation that electro-acoustic music is probably more relevant than tonal music for this problem, I think it is worth observing that Lerdahl and Jackendoff have problems even in their own domain. Basically, those rules seem to work for melody, which means that they can also accommodate accompanied melody. However, there is far more to tonal music than accompanied tonal melody. If the system falls apart the first time it encounters a Bach fugue, how strong can it be? I think there are two basic approaches we take when we try to do segmentation in the visual domain. One is edge detection, for which there is a vast literature in computer vision. There other is determining the extent of a region of a given texture, such as a cloud or a grassy field. That one is a bit trickier but is again being addressed by computer vision. Perhaps Donald Francis Tovey's observation that counterpoint is perceived as texture should not be taken strictly as metaphorical. I would think that the interesting research question is one of whether or not existing computer vision techniques can be adapted to audio signals. Stephen W. Smoliar; Institute of Systems Science National University of Singapore; Heng Mui Keng Terrace Kent Ridge, SINGAPORE 0511 Internet: smoliar(at) FAX: +65-473-9897

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