A Comparison of Discrete Cosine Transform and Discrete Wavelet Transform Techniques in Audio Compression
Pengarang : Endra, S. Kom.,MT
Abstract– Transform coding is one of lossy audio compression methods which converts time domain sampled audio signal into a transform coefficients. In this paper, a comparison of Discrete Cosine Transform (DCT) and Discrete Wavelet Transform (DWT) coding compression performance has done. WAV audio format that contains uncompressed audio is used as audio signals that will be compressed. The average of coefficients absolute value is used as a threshold value.
Experimental results show that DCT and DWT coding have almost the same compression performance. Audio signal that has many peaks and transience decreases the compression performance, both for DCT and DWT coding. DCT coding has a better compression performance than DWT coding for higher threshold value.
Keywords– Transform coding, DCT, DWT, WAV audio format