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For some years now, the introduction of digital terrestrial television (DTTV), also called DVB-T (Digital Video Broadcast - Terrestrial) in Europe and DTV (Digital Television) in the United States, has been progressing rapidly throughout the world. 

DVB-T is an international transmission standard for terrestrial digital television.  Digital TV signals are transmitted in the same frequency range as their analog predecessors.  This is also the range in which RF wireless audio transmission technology operates.  Users of wireless audio transmission are able to use the analog TV channels as secondary users.  In Europe and Africa, analog television occupies only 7 MHz of the 8 MHz wide UHF channel.  Until now, the remaining 1 MHz gap has been used for communication, reporting transmitters and to some extent for wireless microphones.

Figure 1: TV channel with analog television signal

Therefore, before the introduction of digital television, the UHF frequency range was shared by analog TV transmitters and wireless audio transmission equipment.

 
 AnalogTV channel (8 MHz wide)
 Transmission frequency of an RF wireless microphone 
                                                            (200 kHz wide)

Figure 2: Previous use of the UHF range by analog TV channels and wireless audio transmission equipment

Digital television, however, completely occupies the 8 MHz wide channel.  Due to the form of the new digital signal that DVB-T uses, the 1 MHz gap is no longer available.

Figure 3: TV channel with DVB-T signal

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