User`s guide

Random Source
5-361
a five-channel output is equivalent to specifying an Initial seed vector
of
[1012141618].
For complex outputs (
Output complexity parameter set to Complex), a
length-N seed vector can be specified to set a distinct initial generator seed to
be used for the real components of each individual channel. The block
increments these values by 1 to determine the initial seeds used for the
imaginary components of the corresponding channels.
When a scalar seed is specified for a multichannel complex output, the block
uses the specified seed for the real components of the first channel, and
increments the seed by 2 for the real components of each additional channel.
The block increments the specified seed by 1 for the imaginary components of
the first channel, and increments the first channel’s imaginary seed by 2 for
the imaginary components of each additional channel. For example, specifying
an
Initial seed value of 10 for a five-channel complex output is equivalent to
specifying an
Initial seed vector of [10 12 14 16 18]. These values are used
to seed the real-component generator for each channel; the vector
[11 13 15 17 19] is used to seed the imaginary-component generator for each
channel.
Sample Period
The Sample time parameter value, T
s
, specifies the random sequence sample
period when the
Sample mode parameter is set to Discrete. In this mode, the
block generates the number of samples specified by the
Samples per frame
parameter value, M, and outputs this frame with a period of M
∗T
s
. For M=1,
the output is sample-based; otherwise, the output is frame-based.
When
Sample mode is set to Continuous, the block is configured for
continuous-time operation, and the
Sample time and Samples per frame
parameters are disabled. Note that many blocks in the DSP Blockset do not
accept continuous-time inputs.