A dyadic filter bank is any octave filter bank,^{12.6} as illustrated qualitatively in Figure 11.34. Note that is the top-octave bandpass filter, is the bandpass filter for next octave down, is the octave bandpass below that, and so on. The optional scale factors result in the same sum-of-squares for each channel-filter impulse response.
channel-filter impulse response can be defined as
(12.123) |
(12.124) |