Data transmission and recording.

摘要

A data transmission apparatus capable of selecting a first mode in which one data word is made up of m bits with a predetermined sampling frequency and a second mode in which one data word is composed of n bits (m > n) with the same sampling frequency, comprises an insertion circuit (13) for inserting bits (dummy data) of (m - n) bits into the data words of n bits before encoding, an error correction encoder (15) commonly used for the first and second modes, a circuit (16) for eliminating the inserted (m - n) bits from the data, and an adder (18) for adding a block synchronization signal to the data prior to transmission or recording.