Original sentence: A small, but increasing number of music radio stations and stations that carry drama on DAB in the UK are being broadcast in mono when some believe that they should be in stereo, though the majority of UK digital radios have a single speaker.However, most of these reduced bit-rate stations are new entrants to UK radio broadcasting.These stations are, however, generally available in stereo on the digital TV platforms, where capacity constraints are not such a concern.Transmission on DAB is far more expensive than on FM, and measures taken by broadcasters to limit their costs have resulted in some broadcasters choosing to broadcast a lower bitrates to reduce their transmission costs, this delivers sound quality, that some believe, is inferior to traditional FM (see Criticisms of DAB in the UK)
Edited sentence: A large and increasing number of music radio stations and stations that carry drama on DAB in the UK are being broadcast in mono when they should be in stereo.For stationary reception, FM can suffer from hiss when the signal is weak, whereas DAB produces a "bubbling mud" sound when the received signal is too weak for proper decoding.However, in the UK, Denmark, Norway and Switzerland, which are the leading countries with regard to implementing DAB, the vast majority of stereo radio stations on DAB have a lower sound-quality than FM due to the bit rate levels used on DAB being too low.The original objectives of converting to digital transmission were to enable higher fidelity, more stations and more resistance to noise, co-channel interference and multipath than in analogue FM radio.These stations are virtually all available in stereo on the digital TV platforms, however, as well as being stereo on FM.This assumes that the listener has good reception on both DAB and FM, however, but FM can suffer from fading caused by multipath when the receiver is travelling at high speed which DAB is less prone to.Transmission on DAB is far more expensive than on FM, and measures taken by broadcasters to limit their costs have resulted in some DAB ensembles having to carry too many channels, forcing bit rates to be reduced to levels that deliver sound quality inferior to traditional FM (see Criticisms of DAB in the UK)