crc12¶
-
baseband.mark4.header.
crc12
(stream) = <baseband.vlbi_base.utils.CRCStack object>¶ Cyclic Redundancy Check for a bitstream.
See https://en.wikipedia.org/wiki/Cyclic_redundancy_check
Once initialised, the instance can be used as a function that calculates the CRC, or one can use the
check
method to verify that the CRC at the end of a stream is correct.This class is specifically for arrays in which multiple bit streams occupy different bit levels, and the dimension is treated as the index into the bits. A single stream would thus be of type
bool
. Unsigned integers represent multiple streams. E.g., for a 64-track Mark 4 header, the stream would be an array ofnp.uint64
words.- Parameters
- polynomialint
Binary encoded CRC divisor. For instance, that used by Mark 4 headers is 0x180f, or x^12 + x^11 + x^3 + x^2 + x + 1.
See also
baseband.vlbi_base.utils.CRC
for calculating CRC for a single value or an array of values.