Digital Audio Broadcasting DAB+ isn't exactly mainstream in China, but for in-vehicle radios exported to Europe, not having DAB+ basically means you can't get into the OEM supply chain. The EU has required member states to push for DAB+ as a standard feature in new vehicles since late 2020. Germany, Austria, and the Nordic countries moved fast. Some Southern European countries have been more relaxed in enforcement. Every country moves at its own pace. The aftermarket head unit market followed suit. DAB+ certification revolves around three standards systems: WorldDAB functional certification, CE-RED RF compliance, and individual member state localization requirements. You need all three to truly be covered.
One commonly confused point needs clarifying first: ETSI updated EN 300 401 to V2.3.1 a while back, but that standard governs DAB transmitters. In-vehicle DAB+ is a receiving device — receiver RF compliance falls under EN 303 345, which is not affected by EN 300 401 V2.3.1. Even if the transmitter-side standard gets revised, old receiver reports don't automatically become invalid. ETSI provides a 12-to-24-month transition period where both old and new version reports can be used for RED-CE certification.
1. WorldDAB functional certification governs reception performance. Can it find stations, maintain signal when weak, switch channels quickly — that's WorldDAB's domain. Testing follows the ETSI TS 103 461 series, covering sensitivity, adjacent channel selectivity, multipath fading, dynamic reception, and a complete suite of receiver performance tests. Functional certification yields a WorldDAB-issued Receiver Profile certificate indicating the Profile level achieved. Profile 1, 2, and 3 have progressively stricter requirements. Sensitivity ranges from -98dBm to tighter specs — not all products target the same numbers.
2. CE-RED RF compliance governs electromagnetic compatibility. DAB+ is a pure receive device with virtually no RF transmission — unlike WiFi and Bluetooth, which require high-power transmission testing. In the vehicle environment, EMC interference mainly comes from Bluetooth, WiFi, and T-Box transmitters, not from DAB+ itself. RED-EMC testing follows EN 301 489-19 — the DAB receiver-specific EMC standard. Don't generically write "EN 301 489 series." Receiver performance standards are covered by EN 303 345. These are two independent standards — don't mix them up.
3. Localization requirements vary by country. Germany requires testing actual reception of local broadcast stations on top of WorldDAB. France mandates that new vehicles can receive both FM and DAB+ signals, but whether the system auto-switches to DAB+ when FM signal disappears is the automaker's UI design logic — not a regulatory mandate. Italy values field road test data. Switzerland has lots of mountainous terrain, so automakers run additional local road tests beyond standard testing — but Switzerland hasn't published an independent standard stricter than WorldDAB.
II. DAB+ Core Test Items Breakdown
1. Sensitivity testing is the foundation. The lab uses a DAB+ signal source to transmit a standard test stream, gradually reducing signal strength to see how low the module can go and still decode. Different Profile levels have different metrics. Vehicle products have somewhat relaxed metrics because the antenna is mounted inside the vehicle body where the metal frame causes significant signal attenuation. Antenna installation position, front-end LNA selection, and antenna matching network determine the sensitivity ceiling. Design and tuning time for these components is much longer than the testing itself.
2. Adjacent channel selectivity tests interference resistance. DAB+ channel spacing is 1.712MHz. An interfering signal is injected on adjacent channels to see if the module can still decode normally under interference. WorldDAB defines six standard channel models — from open rural to dense urban — all recreated using channel emulators. Channel emulators are expensive, and labs capable of this test are limited. Booking ahead is critical.
3. Dynamic reception testing targets vehicle scenarios. Simulates a vehicle driving at high speed between transmitter sites, checking whether DAB+ can quickly lock onto new frequencies. Automakers have been paying more attention to electric motor noise in recent years, adding reception testing under motor operating conditions during pre-testing. But this isn't a new ETSI standard-level test item — TS 103 461 already includes external interference scenarios.
4. Weak field strength road testing is the most labor-intensive localization requirement. You drive a specified route through designated cities, recording reception success rates at different locations. Germany's route is the longest, covering highways, tunnels, and city centers. Road test data includes GPS coordinates, received signal strength, bit error rate, and subjective audio quality scoring.
III. DAB+ Certification Process
Industry practice is to run WorldDAB functional testing first. After obtaining functional certification, send the same hardware/software version samples for EN 303 345 and RED-EMC testing. Reverse the order — finish RED first, then adjust DSP parameters — and the RED report becomes invalid. Wasted money.
The entire process takes two to three months. If testing fails and design changes are needed, minor upper-layer audio decoding parameter adjustments only require partial retesting — one to two weeks. Only changes to core demodulation algorithms, LNA parameters, or RF matching networks require a full retest, extending the timeline by over a month. Confirm hardware and software versions are stable before submission. Changes to the demodulation core chain and RF parameters are costly, but minor upper-layer application tweaks don't invalidate everything.
Preparing around five sample units is industry convention — neither WorldDAB nor ETSI mandates a specific number. Road test samples and lab samples must have identical hardware and software versions.
For DAB+ certification standards and test items, contact BlueAsia Technology Testing & Certification consultant at 13534225140 (Benson).
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