| 摘要 |
<p>The data transmission conversion system, for converting a 15-secondary-group bundle of a 12MHz C F system with tertiary group construction, and vice versa, constructs 3 subbands each of 5 secondary groups. These subbands are used to convert secondary group and tartiary group construction of a bundle of 15 secondary groups having a mutual spacing of 8 and 12 kHz. Each of the 3 subband is converted into a low frequency band. Each of the 3 tertiary groups of the quaternary group are converted directly in frequency within the 15 secondary- group bundles.</p> |
