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blue ray is noticeably better than broadcast
Minimum audio stream on Bluray is 16bit 48kHz linear PCM, so similar to CD. Can be as high as 24 bit 192kHz.
DVB uses lossy compression (mostly AAC, it seems), bit depth, sample rate and data rate are chosen to suit the content but can be as low as 32kHz sample rate and 32kbit/s data rate for primary streams.
gbj_tester
I’ve no idea but it seems to get better with picture resolution, ie blue ray is noticeably better than broadcast Cash in the Attic on Virgin fibre optic.