Peningkatan Akurasi Speaker Recognition System pada Lingkungan yang Mengandung Noise dengan Menggunakan Metode Discrete Wavelet Transform-Mel Frequency Cepstral Coefficient (DWT-MFCC) = The Accuracy Improvement of Speaker Recognition System in Noisy Environment using the Discrete Wavelet Transform-Mel Frequency Cepstral Coefficient (DWT-MFCC) Method