In digital audio broadcasting, standards are much more unified with practically all countries choosing to adopt the Digital Audio Broadcasting standard (also known as the Eureka 147 standard). The exception being the United States which has chosen to adopt HD Radio. HD Radio, unlike Eureka 147, is based upon a transmission method known as in-band on-channel transmission that allows digital information to “piggyback” on normal AM or FM analogue transmissions.
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Practically all countries choose to adopt HD Radio.
Practically all countries choose to adopt in-band on-channel transmission.
Practically all countries choose to adopt the Digital Audio Broadcasting standard.
Practically all countries choose to adopt the Eureka 147 standard.