Digital System A, known globally as Eureka 147 DAB (Digital Audio Broadcasting), represents a strategic advancement in digital radio technology. It is engineered as a high-quality, robust, multi-service digital broadcasting system with broad applications designed for vehicular, portable, and fixed receivers. Its architecture is inherently flexible, supporting deployment across terrestrial, satellite, hybrid (satellite and terrestrial), and cable broadcast networks.

The system was developed by the Eureka 147 Consortium and has been formally endorsed by the European Broadcasting Union (EBU) as the preeminent standard for digital sound broadcasting. The complete technical specification is codified and publicly available as the European Telecommunications Standard ETS 300 401.

A foundational architectural choice in its design was the decision to structure the system according to a layered model. This framework is fully compliant with the Open Systems Interconnection (OSI) basic reference model established by the International Organization for Standardization (ISO). This layered approach provides a logical and modular description of the system’s functions.

This monograph will systematically dissect this layered architecture, proceeding from the application level, which defines the services offered to the listener, down through the intermediate layers to the physical transmission of the radio signal.