US 2003/0227987 A1 · Decoding method and manchester decoder

Abstract

A method and a corresponding decoder for decoding a Manchester encoded binary data signal includes receiving the Manchester encoded binary data signal having a first sequence of central bit transitions and a second sequence of initial bit transitions. A local clock signal is generated, and the central bit transitions of the Manchester encoded binary data signal are determined. Determination of the central bit transitions includes measuring the time interval elapsing between a pair adjacent central bit transitions, expressed as a number N of cycles of the local clock signal, and selecting each successive central bit transition based upon the time interval N measured between the pair of central bit transitions which immediately precede the successive central bit transition.

Claims26

Dependent claims

Method for decoding a Manchester encoded binary data signal (RX_DATA), said method comprising the following steps:

receiving the binary data signal (RX_DATA) comprising a first sequence of central bit transitions (40) and a second sequence of initial bit transitions (42),
generating a local clock signal (CK), and
determining the central transitions (40) of said encoded binary data signal (RX_DATA),
characterized in that the central transitions (40) determining step comprises the following steps:
measuring, by means of the local clock signal (CK), the time interval elapsing between a pair of adjacent central transitions (40), said interval being expressed as a number N of cycles of the local clock signal (CK),
selecting each successive central transition (40) on the basis of the time interval N measured between the pair of central transitions (40) which immediately precede said successive central transition (40).

3 more elements

Decoder (20) for a Manchester encoded binary data signal (RX_DATA), said data comprising a first sequence of central bit transitions (40) and a second sequence of initial bit transitions (42), said decoder comprising:

a generator (22) for supplying a local clock signal (CK),
a first state machine (30) for generating a first signal (HALF_EDGE) comprising pulses (41) corresponding to said central transitions (40), the first signal being obtainable starting from said encoded binary data signal (RX_DATA),
a counter device (24), increased by said clock signal (CK), for measuring a time interval elapsing between two adjacent central transitions (40),
characterized in that the first state machine (30) comprises:
means (53,55) for generating a second signal (ANY_EDGE) comprising pulses corresponding to both sequences (40,42) of central and initial transitions,
masking means (56,57) for selecting each successive central transition (40) eliminating from said second signal pulses corresponding to any initial transition (42) which precedes said successive central transition (40), said masking means (56, 57) being such as to eliminate said initial transition (42) on the basis of the time interval measured between the pair of selected adjacent central transitions (40) which immediately precede said successive central transitions (40).

3 more elements

Dependencies are inferred from the claim text.

Decoding method and manchester decoder

Life of this patent

Decoding method and manchester decoder

Life of this patent

Abstract

Claims26