# TDC

From JP1 Remotes

# **TDC**

### TDC-38 and TDC-56

IRP notation for TDC-38: {38k,315,msb}<-1,1|1,-1>(1:1,D:5,S:5,F:7,-89m)+ IRP notation for TDC-56: {56.3k,213,msb}<-1,1|1,-1>(1:1,D:5,S:5,F:7,-89m)+ EFC translation: 7-bit MSB.

There are two variants of this protocol, with different frequencies but with the same number of carrier cycles in each burst, which makes the duration of a burst also differ. TDC-38 has a 38kHz carrier and is used by Danish TDC IPTV. TDC-56 has a 56.3kHz carrier and is used by Italian ALICE Home TV box. These implementations effectively use a 6-bit OBC as bit 0 of F is always the complement of bit 1, but there are other implementations which do not follow that pattern.