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Language Development and Neurological Theory presents a neuropsychological theory of language development. The discussions are organized around the following themes: cerebral specialization for language in normal and brain-damaged individuals; development of cerebral dominance; and speech perception. Much emphasis is placed on the issue of cerebral specialization, or lateralization. Comprised of 20 chapters, this volume begins with a review of some of the methods used to correlate neurophysiological and behavioral functions, as well as some of the issues involved in trying to unite the empirical science of neuropsychology and the rationalist science of linguistics. The next chapter deals with lateralization for speech sounds shown by young infants and possible factors in the sound signal responsible for the differentiation. Subsequent chapters focus on asymmetries in young children during continuous verbal-nonvisual and visual-nonverbal story tasks; the effects of multi-language elementary school program on the degree of lateralization for language; intramodal and cross-modal pattern perception in stroke patients with lateralized lesions; and visual half-field asymmetries in deaf and hearing children. Several hypotheses as to why language is lateralized to the left hemisphere rather than to the right are also examined. This book is addressed to researchers and students of the neuropsychology of language, whether they call themselves psychologists, neuropsychologists, neurologists, or linguists.
It has been recognized for a long time that a conventional sequential processor is inefficient for operations on pictorial data where relatively simple operations need to be performed on a large number of data elements (pixels). Though many parallel processing architectures for picture processing have been proposed in the past, very few have actually been implemented due to the costs involved. With LSI technology, it is becoming possible to realize parallel architectures at a modest cost. In the following the authors review some of the proposed architectures for pattern recognition and image processing.
Pitch (i.e., fundamental frequency FO and fundamental period TO) occupies a key position in the acoustic speech signal. The prosodic information of an utterance is predominantly determined by this parameter. The ear is more sensitive to changes of fundamental frequency than to changes of other speech signal parameters by an order of magnitude. The quality of vocoded speech is essentially influenced by the quality and faultlessness of the pitch measure ment. Hence the importance of this parameter necessitates using good and reliable measurement methods. At first glance the task looks simple: one just has to detect the funda mental frequency or period of a quasi-periodic signal. For a number of reasons, however, the task of pitch determination has to be counted among the most difficult problems in speech analysis. 1) In principle, speech is a nonstationary process; the momentary position of the vocal tract may change abruptly at any time. This leads to drastic variations in the temporal structure of the signal, even between subsequent pitch periods, and assuming a quasi-periodic signal is often far from realistic. 2) Due to the flexibility of the human vocal tract and the wide variety of voices, there exist a multitude of possible temporal structures. Narrow-band formants at low harmonics (especially at the second or third harmonic) are an additional source of difficulty. 3) For an arbitrary speech signal uttered by an unknown speaker, the fundamental frequency can vary over a range of almost four octaves (50 to 800 Hz).
Originally published in 1978, this seventh volume of an international series continues the objective to increase and disseminate scientific knowledge in the area of human attention, performance and information processing, and to foster international communication in this area. This volume covers the following topics: time in perception; word perception and reading; speech perception and coding; hemisphere differences; response and physiological processes; theories and models. Today it can be read and enjoyed in its historical context.