muhammad11
Member level 2
Any expert especially in digital communication should answer.Is it possible to transmitt digital signal for radio broadcasting on air.If not then why DRM and DAB say that they have digital transmitter
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The signals carry data which is converted back to analog in the receivers but the RF is still 'analog' using QAM or QPSK. Instead of the audo being represented by different carrier levels or frequencies, it is digitized and the digits are sent over the air instead. The primary reason is it is possible to compress digital data (like in a ZIP file) so more can be sent within a given bandwidth than if it stayed analog. DRM for example gives quite high quality stereo audio with a text channel for information and it is sent in a channel only about 50% wider than a low quailty AM broadcast.
Brian.