1-D Perfect Reconstruction Filter Bank
Our audio compression scheme is some what different from the image compression
scheme. The similarities include a 4-level DWT - IDWT structure. The differences
include a real-time implementation on DSP56002 EVM, Daubechies-24 basis
& a Static Bit allocation scheme. The output was quantized for a compression
ratio of x4. However, we did not code the loss-less coding step on the
56002.
The Decomposition and Reconstruction Filter Banks are given below in
Figure 1 & Figure 2. In our implementation, we used the Polyphase form
for these structures thereby increasing the computational efficiency.
Figure 1: 1-D 4 Level Analysis Tree
Figure 2: 1-D 4 Level Synthesis Tree corresponding to the
Analysis Tree in Figure 1.