8.3.7.5.1 IrDA Modulation

For baud rates up to and including 115.2 kbit/s, the RZI modulation scheme is used. “0” is represented by a light pulse of 3/16th of a bit time. Some examples of signal pulse duration are shown in the following table.

Table 8-26. IrDA Pulse Duration
Baud RatePulse Duration (3/16)
2.4 kbit/s78.13 μs
9.6 kbit/s19.53 μs
19.2 kbit/s9.77 μs
38.4 kbit/s4.88 μs
57.6 kbit/s3.26 μs
115.2 kbit/s1.63 μs

The following figure shows an example of character transmission.

Figure 8-43. IrDA Modulation