User`s guide

Dyadic Analysis Filter Bank

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Latency

Zero Latency. The Dyadic Analysis Filter Bank block has no tasking latency for

frame-based operation, which is always single-rate. The block therefore

analyzes the first input sample (received at t=0) to produce the first output

sample at each port.

Nonzero Latency. The Dyadic Analysis Filter Bank block has tasking latency

only for sample-based operation, which is always multirate. As shown in the

table below, the amount of latency, D, depends on the structure (symmetric or

asymmetric) of the n-level tree used by the block.

In the above cases, the block repeats a zero initial condition in each channel for

the first D output samples. For example, in single-tasking mode, the

asymmetric tree structure generates 2

n-1

zero-valued output samples at each

port in each channel before propagating the first analyzed input sample

(computed from the input received at t=0).

See “Excess Algorithmic Delay (Tasking Latency)” in Chapter 3 and “The

Simulation Parameters Dialog Box” in the Simulink documentation for more

information about block rates and Simulink’s tasking modes.

Multirate... Symmetric Tree Asymmetric Tree

Single-tasking

One sample 2

n-1

samples

Multitasking

One sample 2

n-1

samples

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