Signal-Adapted Binary Tree-Structured Paraunitary Filter Bank Design

Signal udapted filter bank design that uses energv compaction as the adaptation criterion has been applied in the pmf io quadrature mirror filter fQMF) banks, av well as io M-channel FIR paraunito?yyfilrer banks. In this paper, we extend ihis analysis io free siructured filter banb having signal adapted, FIR QW banks at each level, and show that fewer puranierer nliacarion to represent filter coeffcients is required far tree structured fiber banks with similar energy compaction peiforniance, compared to an equivalent stnicfure filter bonk with M channels. 1. totroduction Digital filter banks such as the one shown in Figure 1 have been employed in the past to decompose a signa