Genomic signal processing (GSP) focuses on the study of genomic data using digital signal processing technologies. Genomic data must be transformed or mapped to a numeric representation before tools of digital signal processing can be used. There are various DNA numeric representations (DNR) techniques such as Voss vector representation, integer sequence representation, real sequence representation, atomic number numerical representation, EIIP sequence representation, etc. In this paper, we have represented DNA sequence into numeric representations and then used short-time Fourier transform (STFT) for evaluation of PSD and correlation sequence of DNA. Genetic data can be used to identify patients who are at high risk of getting certain diseases and in this way, GSP can be used for better treatments of patients.