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What is the theory of Acoustics of Speech and Hearing?
The Acoustics of Speech and Hearing is an H-level graduate course that reviews the physical process involved in the production as well as propagation and reception of human speech.
It gives importance to how the acoustics and mechanics of the speech and auditory system define what sounds are capable of producing and what sounds it is able to sense.
It gives importance to acoustic cues used in determining the direction of the sound source and the acoustic and mechanical mechanisms involved in speech production.
Advanced Structural Dynamics
It also gives importance to the acoustic and mechanical mechanism used by the transducer and analyzes sounds in the ear. This is an experimental procedure to find which aspects of the signal are used by listeners in decoding speech either to find out more about the signal or to find out more about the listener. This usually asks listeners to identify a word or to discriminate between pairs of words. This uses synthetic or manipulated speech signals to get control over the exact sound.
What is the Acoustics of Speech Signal?
The acoustic speech signal received by a listener is a function of the source and distance as well as early reverberation and late reverberation, and noise and depends on the Speech Audibility Index, which is defined as the proportion of the combined direct speech and early reverberation.
This is also known as early reflections whose level is above that of the combined noise and late reverberation and the Speech Audibility Index rises from 0 to 100% as the effective signal-to-noise ratio rises from -15 to +15 dB. Both reverberation and ambient noise are low in order to maintain Speech Audibility Index at an optimal level.
Speech Audibility Index is used to predict various measures of speech perception and the results are highly dependent on the complexity of the language as well as the characteristics of the listener and the conditions that are tolerable for normally hearing adults in casual conversation which can be difficult for adults and children in learning situations and is not tolerable for persons with deficits of hearing and language as well as attention or processing.
Sound-field amplification improves Speech Audibility Index for all listeners in a noisy room and it offers less benefit when the primary problem is reverberation. If it is not properly installed, it can make the reverberation problem worse and there is no good substitute for reverberation control. Audiologists have an important contribution to make the identification and resolution of continuing inadequacies of classroom acoustics.
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