Wiktionary
subband
alt. A subdivision of a band (especially one of frequency) n. A subdivision of a band (especially one of frequency)
Usage examples of "subband".
Called the A-3, this Bell Telephone device not only switched the substitution assignments for its five subbands but inverted them as well.
The engineers soon learned the nature of the A-3 system and found that they had to wire circuits for only the six different combinations of subband substitutions.