Coding in the Field I will now discuss the exact coding of Sony and NEC systems. Pioneer, Onkyo, Akai, Canon, Goldstar, Hitachi, Kenwood, NEC, Teac, and Yamaha all use the NEC chip. IR data is always transmitted least significant bit first so the first data bit sent is lowest order. In a real binary representation it would be the rightmost bit having a weight of 1. Sony data consists of a different number of bits in the message.
Some remotes can control more than one device so they can send codes of different lengths.
Here is an example from a Sony DVD S7000 as it appears in the ProntoEdit Hex Display. 03f6 Let us break it up to decipher it. The code length is 20 bits plus 1 more pair for the lead in. The lead in burst. Four units of on followed by 1 unit of off, where a unit is 600 microseconds.