The Manchester coding used for the PHY I and PHY II layers includes the clock inside the transmitted data by representing a logic 0 with an OOK symbol " 01 " and a logic 1 with an OOK symbol " 10 ", all with a DC component.
12.
Each word is preceded by a 3 ?s sync pulse ( 1.5 ?s low plus 1.5 ?s high for data words and the opposite for command and status words, which cannot occur in the Manchester code ) and followed by an odd parity bit.
13.
The 16 bits comprising each word are transmitted using Manchester code, where each bit is transmitted as a 0.5 ?s high and 0.5 ?s low for a logical "'1 "'or a low-high sequence for a logical "'0 " '.
14.
:: Early digital magnetic recording systems used Manchester coding, which has no DC bias ( meaning there's no net current over a nontrivial sequence ); I would expect a Manchester coded magnetic recording scheme would similarly result in no net change of the magnetic field over a non-small region-regardless of what is stored.
15.
:: Early digital magnetic recording systems used Manchester coding, which has no DC bias ( meaning there's no net current over a nontrivial sequence ); I would expect a Manchester coded magnetic recording scheme would similarly result in no net change of the magnetic field over a non-small region-regardless of what is stored.
16.
However, it is helpful to see NRZ transitions as happening on the trailing ( falling ) clock edge in order to compare NRZ-Level to other encoding methods, such as the mentioned Manchester code, which requires clock edge information ( is the XOR of the clock and NRZ, actually ) see the difference between NRZ-Mark and NRZ-Inverted.
17.
The handset contains a keypad and a transmitter integrated circuit ( IC ) driving an IR LED . The command data is a Manchester coded bitstream modulating a 36 kHz carrier . ( Often the carrier used is 38 kHz or 40 kHz, apparently due to misinformation about the actual protocol . ) The IR signal from the transmitter is detected by a specialized IC with an integral photo-diode, and is amplified, filtered, and demodulated so that the receiving device can act upon the received command.
