Abstract
Results obtained with a sound spectrograph and pattern playback are presented in this paper. The playback synthesizes speech sounds, using modulated light transmitted through a photographic copy of an original spectrogram, or reflected from a hand-drawn version. Tests of connected speech so produced indicate that a rather high order of intelligibility is achieved. The hand-drawn spectrograms can be simplified and schematized to a considerable degree without appreciable loss. In general, either type of spectrogram can be modified in a variety of ways, and the effects of these modifications can then be evaluated by listening tests.
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