WASET
    Samba Raju and  Chiluveru and  Manoj Tripathy,  Speech Intelligibility Improvement Using Variable Level Decomposition DWT.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2020, vol. 157(1). 23 - 26
    [viewed 29 March 2024]. Available from: https://publications.waset.org/pdf/10011030.