Extraction of Speech Transmission Index from Speech Signals Using Artificial Neural Networks
This paper presents a novel method to extract Speech Transmission Index (STI) from reverberated speech utterances using an artificial neural network. The convolutions of anechoic speech signals and simulated impulse responses of rooms of various kinds are used to train the artificial neural network. A time to frequency domain transformation algorithm is proposed as the pre-processor. A multi-layered feed forward neural network trained by back-propagation is adopted. Once trained, the neural network can accurately estimate Speech Transmission Index from speech signals received by a microphone in rooms. This approach utilises a naturalistic sound source, speech, and hence has potential to facilitate occupied measurement.
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