Semiconductor group Toumaz said it was trading in line with expectations and said it forecast a 30% rise in revenue in the first half of the year.The London-listed group said the jump in revenue will be driven by its digital audio business, with the connected audio division registering growth of approximately 60% in the year to date in terms of volume.The group said its digital radio unit was boosted by sizeable growth in Norway and Germany, while the group said its healthcare division had continued to grow and expected further hospitals trials on its vital signs monitoring system to start in the short term future.Toumaz shares were up 0.71% to 3.40p at 11:19 on Thursday.