1. Digital Audio Encoding:
The first step is to encode the digital audio signal using an appropriate audio codec, such as MP2, MP3, AAC, or HE-AAC. This process involves converting the audio waveform into a digital bitstream that can be transmitted efficiently.
2. Multiplexing:
Next, the encoded digital audio signal is multiplexed with other data, such as station identification, program information, and error correction codes, to create a digital audio transport stream.
3. Modulation:
The digital audio transport stream is then modulated onto a carrier frequency using a modulation scheme such as frequency modulation (FM) or quadrature amplitude modulation (QAM). This process converts the digital signal into an analog signal that can be transmitted over the airwaves.
4. Transmission:
The modulated analog signal is then transmitted from a radio transmitter to the intended coverage area. The transmitter uses an antenna to broadcast the signal over the FM radio band, which typically ranges from 88 MHz to 108 MHz.
5. Reception and Demodulation:
At the receiver's end, the FM radio picks up the transmitted analog signal and demodulates it to extract the digital audio transport stream.
6. Decoding:
The digital audio transport stream is then de-multiplexed to separate the encoded audio signal from other data. The encoded audio signal is then decoded using the appropriate audio decoder to reproduce the original digital audio.
7. Playback:
The decoded digital audio is then played back through the FM radio's speaker or headphones, allowing the user to listen to the digital radio broadcast.
It's worth noting that digital radio broadcasting standards may vary in different regions or countries, and specific protocols, such as DAB (Digital Audio Broadcasting) or HD Radio, might be employed for DRB.