Signal Processing Toolbox™

dfilt.delay - Delay filter

Syntax

Hd = dfilt.delay
Hd = dfilt.delay(latency)

Description

Hd = dfilt.delay returns a discrete-time filter, Hd, of type delay, which adds a single delay to any signal filtered with Hd. The filtered signal has its values shifted by one sample.

Hd = dfilt.delay(latency) returns a discrete-time filter, Hd, of type delay, which adds the number of delay units specified in latency to any signal filtered with Hd. The filtered signal has its values shifted by the latency number of samples. The values that appear before the shifted signal are the filter states.

Examples

Create a delay filter with a latency of 4 and filter a simple signal to view the impact of applying a delay.

h = dfilt.delay(4) 
h = 
     FilterStructure: 'Delay'
             Latency: 4      
    PersistentMemory: false  

sig = 1:7	     % Create some simple signal data
sig =
     1     2     3     4     5     6     7

states = h.states    % Filter states before filtering
states =
     0
     0
     0
     0

filter(h,sig)       % Filter using the delay filter
ans =
     0     0     0     0     1     2     3

states=h.states     % Filter states after filtering
states =
     4
     5
     6
     7

See Also

dfilt

dfilt.cascade

dfilt.df1