GY-63_MS5611/libraries/NeumannCorrector/README.md
2023-12-02 16:17:42 +01:00

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NeumannCorrector

NeumannCorrector is an Arduino library for a correcting a random streams of bits.

Description

NeumannCorrector is an EXPERIMENTAL library.

The goal of a NeumannCorrector is to extract a random stream of bits from a stream that is unbalanced in the number of ones and zeros. The working is based upon the fact that in such a stream there will always be an equal amount of 0->1 transitions as 1->0 transitions. The algorithm compares pairs of bits, resulting in an often substantial lower bitrate at the outside. At least a factor 2 and often more. For large number of bits the unbalance(skew/bias) is removed.

The 0.1.0 version is more or less a reference implementation. It can be used for experiments and for educational purposes.

As always remarks are welcome.

Interface

#include "NeumannCorrector.h"

Core

  • NeumannCorrector() constructor, internal seize = 32 bits.
  • void clear() sets the internal buffer to 0.
  • uint8_t available() returns bits available in internal buffer.
  • uint8_t size() returns the size of the internal buffer. (32 hardcoded).

Add

  • void add(uint8_t in) adds zero or more bits of the param to the internal buffer.

Get

  • uint8_t get() returns 8 bits from the internal buffer, even if these are not available.
  • uint16_t get16() returns 16 bits from the internal buffer, even if these are not available.
  • uint32_t get32() returns 32 bits from the internal buffer, even if these are not available.

Future

Must

  • documentation

Should

Could

  • add xor mask in constructor, to xor every incoming value
    • or a multiply add shift mask?
  • extend unit tests.
  • add16() + add32() ?

Wont

  • add a non-zero starting value for internal buffer?

Support

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Thank you,