Assignment Problem: Speech Recognition Task: Designing a Simple Speech Recognition System
This project asks you to use the Fast Fourier Transform (FFT) to extract information from speech signals. In order to complete this project, you need to calculate the FFT, convert between the FFT bin number and the corresponding frequency in Hz, and interpret graphs of the FFT of signals. You also would be able to design digital filters to remove noise or unwanted signals from the available speech signals. To do so, you will design digital filters to suppress the noise such that it will no longer affect the decision making of the speech recognition system. The specifications of the filter are not given, which requires the students to design a filter, test it, and if necessary, modify it.
The first scenario: As the main part of this project, you will design a simple speech recognition system which is able to recognize if a recorded voice signal is "Yes" or "No". This part of the project can be implemented in the following steps:
a) Data collection
b) Partitioning the database into training and test sets
c) Calculating FFT
d) Feature extraction
e) Classification
f) Test and verification
The second scenario: Aiming to improve the performance of the speech recognition system in the first scenario, students will redesign the system to make it capable of working under a noisy condition. That is, when a specific noise (such as a single tone) is added to the voice samples.
The third scenario: In this scenario, students write a code which is capable of recognizing "Yes" and "No" from the echo-affected recording samples.
The fourth scenario: As the fourth scenario, you will design a speech recognition system which is able to distinguish male speaker from the female ones. This part can be implemented using an approach similar to the first scenario. The database prepared (data collected) for the first scenario can also be used for this scenario.
The fifth scenario: In this scenario, you will design a speech recognition system similar to that of the first scenario which is able to distinguish four arbitrary chosen words (instead of the two words "Yes" and "No" in the first scenario).
The sixth scenario: Implementing the fifth scenario on a remote control toy car.
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Attachment:- Speech Recognition System.rar