Digital transmission data supply method, involves generating digital extension data based on flow of user data and fixing extension data such that portion of frequency in frequency spectrum of digital transmission data is minimized

摘要

The method involves generating digital extension data based on a flow of digital user data. A data supply circuit (1) inserts the digital extension data to a predetermined position in a digital transmission data. The circuit then supplies the digital transmission data to a transmission medium (3). The digital extension data is fixed such that the portion of frequency in a frequency spectrum of the digital transmission data is minimized. An independent claim is also included for a data supply circuit comprising an extension data generator.