scipy.signal.max_len_seq¶
- scipy.signal.max_len_seq(nbits, state=None, length=None, taps=None)¶
Maximum Length Sequence (MLS) generator
Parameters: nbits : int
Number of bits to use. Length of the resulting sequence will be (2**nbits) - 1. Note that generating long sequences (e.g., greater than nbits == 16) can take a long time.
state : array_like, optional
If array, must be of length nbits, and will be cast to binary (bool) representation. If None, a seed of ones will be used, producing a repeatable representation. If state is all zeros, an error is raised as this is invalid. Default: None.
length : int | None, optional
Number of samples to compute. If None, the entire length (2**nbits) - 1 is computed.
taps : array_like, optional
Polynomial taps to use (e.g., [7, 6, 1] for an 8-bit sequence). If None, taps will be automatically selected (for up to nbits == 32).
Returns: seq : array
Resulting MLS sequence of 0’s and 1’s.
state : array
The final state of the shift register.
Notes
The algorithm for MLS generation is generically described in:
The default values for taps are specifically taken from the first option listed for each value of nbits in:
- http://www.newwaveinstruments.com/resources/articles/
- m_sequence_linear_feedback_shift_register_lfsr.htm
New in version 0.15.0.