## 8 Conclusions  
Digital transformation is an important topic for today's researchers. The migration from the analog into the digital domain remains a challenge in a number of fields. Broadcasting, among many, is one of them. Undeniably, the DAB+ system is one of the leading standards of terrestrial digital radio transmission. Compared with analog FM radio, it offers greater possibilities of delivering high-quality content. Its main feature, related with forming the ensemble for a number of predefined audio or data services, enables flexibly \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Profile** & **DAB+ MOS Score** & **FM MOS Score** & **MOS Difference** \\ \hline Talk 1 & 4.37 & 3.91 & 0.46 \\ Arts & 4.30 & 4.28 & 0.02 \\ Talk 2 & 4.36 & 3.68 & 0.68 \\ Pop Music & 4.26 & 4.21 & 0.05 \\ Regional PL & 4.38 & 3.61 & 0.77 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Difference in subjective MOS judgements of simulcasted DAB+ and FM radio programs—evaluated multiplex ensemble configuration. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Profile** & \
\begin{tabular}{c} **Bitrate (kbps)** \\ **Previous Config.** \\ \end{tabular} &
\begin{tabular}{c} **Bitrate (kbps)** \\ **Investigated Config.** \\ \end{tabular} & **MOS Difference** \\ \hline Talk 1 & 112 & 112 & 0.14 \\ Arts & 128 & 128 & \(-\)0.07 \\ Talk 2 & 112 & 112 & 0.52 \\ Pop Music & 112 & 128 & \(-\)0.04 \\ Regional PL & 104 & 112 & 0.25 \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Difference in subjective MOS judgements of DAB+ radio programs—previous and investigated multiplex ensemble configuration. assigning bitrates and easily reconfiguring the multiplex when needed. Nowadays, many broadcasts are simulcasted in DAB+ and FM. This fact implies a direct comparison of the quality offered by both technologies carried out by listeners themselves. Currently, only one country went fully digital and performed a total switchover from analog FM to digital DAB+ radio. Other countries involved in the digitalization process are still making adjustments in order to best meet user demands. This paper shows the development of the digital radio market, as well as a case study of a selected DAB+ multiplex ensemble, including offered radio programs, their profile, and allocated resources. It presents the results of numerous subjective and objective quality evaluation studies concerning broadcasting in both digital and analog techniques, over the past years. The results of this particular study may help both researchers and scientists, as well as policy makers and professionals from all over the world, that are involved in the digitalization process. It also provides a good background for new parties, particularly those active in the field of broadcasting and electronic media that currently may hesitate about joining the digital radio market. Future studies may focus on new broadcasters that recently joined the commercial multiplex. It would be interesting to investigate their requirements as content providers when it comes to delivering high-quality services to the end user. Moreover, it would be surely curious to analyze an even broader range of audio signals, including different music genres and not to mention various profiles of the AAC codec itself. A survey, concerning possibilities, limitations and user expectations related with DAB+ that could help understand the radio market may be found in [53]. Further studies and analyses on the digital radio market and user expectations are described in [54; 55]. On the other hand, a study focused on current trends in the consumption of multimedia content using online streaming platforms is available in [56]. Moreover, cooperation with other authors, as well as institution, would contribute to the development of guidelines and recommendations that are necessary for accelerating the digitalization process. The switchover itself requires both higher penetration and increase in the popularity of the DAB+ broadcasting standard. Undoubtedly, a broader program offer would accelerate the process.