How does green laser pointer receive signals?

It is the use of two phase phase modulation system, also known as phase encoding (PE), it is the use of two phase), a difference of 180 magnetization reversal of direction on behalf of the data 'and 180 ° by 180 ° magnetization reversal in the direction of representative data '0' and '1 '. In other words, assume that the recorded data 'that is, assume that the recorded data '0', the provisions of the direction of the magnetization reversal from negative to positive, record data 'is becoming the direction from negative into positive record data '1 'is becoming two consecutive or two above' or negative. When the continuous emergence of two or more '1 'or '0' in order to maintain the above-mentioned principles, in order to maintain the above principles, the bit period at the beginning have to flip a computer component principle 8.2.3 magnetic recording means (5)Users may turn on and off the green laser pointer at any time with the ON/OFF keystroke on body. The record of the frequency modulation (FM) frequency modulation (FM) FM System of Computer Science rules in the record ' The record of the rules of the FM system, record '1 ', the center of not only the reign of the cycle the magnetization reversal of the center of a magnetization reversal, must also be and reign with the bit between the flip. record' cycle center is not overturned, to be flip. record '0 ', the center of the bit period does not produce the flip, but the boundary between the bit and bit flip once the boundary between the bit and bit flip once twice twice the frequency of the magnetization reversal when the record data recorded data magnetization reversal frequency for recording data '0 'twice, because when the magnetization reversal frequency record data this also known as the 'multiplier system' also known as the 'multiplier system.' The green laser pointer receives signals by the USB RF receiver.26 Principles of Computer Organization 8.2.3 magnetic recording method (6) to improve the frequency modulation (MFM) to improve this record of the frequency modulation (MFM) School of Computer Science basic FM system, this recording is basically the same with the FM system, namely, to record the data reign cycle center magnetization reversal cycle center of '1 'when the reign of magnetization reversal time, record data center of the bit period when magnetization turned transfer time does not flip. '0 'is not overturned. difference is that the only continuous record of more than two or not flip' starting position flip over when a '0 'before the reign of the cycle time rather than roll over at the start of each cycle, rather than at the start of each cycle, flip 27 computer component principle 8.2.3 Magnetic Recording way synchronization signal: read from the magnetic surface storage signal when the synchronization signal: the memory readout signal from the magnetic surface, in order to separate the time required for data reference signal separation of the time required for data reference signal.The shortest wireless control distance of this green laser pointer is 15m.