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Sequential System for Recognizing Spoken Digits in Real Time

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A real time system for recognizing the ten digits spoken in Italian language is described.

An analyzer, composed of 17 filters uniformly covering the frequency range from 110 Hz to 5600 Hz and the corresponding rectifying and level-detecting units, yields a set of 17 binary outputs as functions of time. These outputs are processed by a real time system composed of ten units, each of which performs the classification of one of the ten digits. Each unit is characterized by a few combinational networks, recognizing the vowels or some consonants or some typical transitions of the word, and by a sequential circuit analyzing the time evolution of the outputs of the combinational networks.

The performance of the system is without faults in recognizing the ten recorded voices used in the learning process. Much less efficiency may be found in recognizing other voices, but for many speakers some training is sufficient to obtain better performances.
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Document Type: Research Article

Publication date: January 1, 1967

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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