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Encoding Schemes

November 2, 2012 10:21 am

Encoding Schemes

Code Name :   NRZ-L

Binary Code : 11001011

Code Definition:

Non-Return-to-Zero Level

  • “One” is represented by one level
  • “Zero” is represented by another level lower the one but not zero.

Code Name :   NRZ-I

Binary Code : 11001011

Code Definition:

Non-Return-to-Zero Inverse

  • “One” is represented by no change in level
  • “Zero” is represented by change in level.

Signal

                       

 

Code Name :   RZ

Binary Code : 11001011

Code Definition:

Return-to-Zero

  • “One” is represented by positive to zero
  • “Zero” is represented by negative to zero

Code Name :   Manchester

Binary Code : 11001011

Code Definition:

Manchester encoding uses an inversion at the middle of each bit interval for both synchronization and bit representation.

A negative to positive transition represent binary 1 and a positive to negative transition represent binary 0.

The rising edge in the centre of the data bit indicates either a logic ‘1’ or alternatively a logic ‘0’.

Code Name :   AMI

Binary Code : 11001011

Code Definition:

Alternate mark inversion (AMI) is a digital transmission technique in which binary values are sent by three voltage states.

  1. ‘0’ bits by a voltage of 0 volts.
  2. ‘1’ bits by a voltage of +V volts or -V volts alternatively

Code Name :   Differential Manchester

Binary Code : 11001011

Code Definition:

  • A 1 bit is indicated by the absence of a transition at the start of the interval.
  • A 0 bit is indicated by the presence of a transition.
  •  No transition during the interval indicates no signals are present.

 

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