Graduate Thesis Or Dissertation
 

Digital translation of speech formant frequencies

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/5t34sn309

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  • In recent years, studies indicate that the second formant of normal speech contains the majority of the information necessary for speech intelligibility. This thesis presents a system to translate the second formant frequencies to within a more adequate hearing range of the partially deaf. The digital speech translator, DISTRAN, utilizes pulse amplitude modulation of an input audio signal. The pulse amplitude modulated signal is gated into a series of storage circuits in synchronism with a first digital signal whose frequency constitutes the desired sample rate. The contents of the storage circuits are then sequentially read out at a second, altered frequency so as to construct a second pulse amplitude modulated signal whose basic frequency is altered from that of the first. Redundant segments of speech are discarded or added so that the time interval of the processed speech is that of the original. The second pulse amplitude modulated signal is then demodulated, which converts the second pulse amplitude modulated signal into an output audio signal, altered in frequency from the input.
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