Justice Abdul Nazeer dismissed the petition filed by Karnataka State Cable T V Operators' Association observing there was no merit in it and refused to grant any more time.
The court had earlier extended the March 31 deadline several times.
The Association had pleaded for more time, saying they have sought information from the Multi-System Operators on the selling and package cost of STBs.
Only about 40 per cent of households in Bangalore and Mysore have digitised TV connections.
As part of the second phase of the digitisation of TV viewing, the Centre had set March 31 as deadline for installation of STBs in 38 cities.