A brief survey of a DCT-Based Speech Enhancement System
نویسندگان
چکیده
Discrete Cosine Transform (DCT) has similar performance to the Karhunen-Loeve Transform (KLT) & same properties to the Discrete Fourier Transform (DFT). It is advantageous for speech enhancement as it provides better energy compaction capability. Though there is a perfectly stationary signal, frame to frame variations of DCT coefficients are observed. In pitch synchronous analysis DCT based speech enhancement system is introduced to overcome the problem. The window shift is based on pitch period hence the drawbacks of fixed window shift are reduced by DCT. Afterwards a Wiener filter with an adaptive controller is used to noise. This proposed speech enhancement system gives good quality of speech which can be used in no. of applications.
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