Insights into JD DingDong Smart Speaker: Speech Recognition, Custom Wake Words, and Natural Language Understanding

Interview with JD DingDong's chief scientist, who has over 20 years of experience in voice technology, introduces the team responsible for speech technology, natural language understanding, machine translation, and product innovation within JD's smart speaker division.

Since the first generation of JD DingDong smart speakers launched three years ago, the product has undergone more than 300 functional iterations, handling billions of interactions and accumulating extensive experience in speech recognition, synthesis, and wake‑up technologies.

To improve speech‑recognition accuracy, JD DingDong employs a microphone‑array for superior positioning, noise reduction, and echo cancellation, adopts cutting‑edge Chinese speech‑recognition models powered by the latest deep‑learning advances, and continuously updates algorithms. The company also tailors acoustic models for different user demographics and maintains a long‑term data collection pipeline to refresh vocabularies and language models.

Custom wake‑word functionality is emphasized as a way to create a personal connection between users and the device. Implementing user‑defined wake words requires massive training data, so JD leverages big‑data techniques to generate models from qualitative text, sets individualized wake‑word thresholds with a stable real‑time adjustment scheme, and applies objective rating criteria to guide users toward effective wake words.

Natural language understanding (NLU) in the speaker integrates three paradigms—probabilistic (empiricist), deep‑learning (connectionist), and knowledge‑graph (symbolic)—to balance false‑positive and false‑negative rates, supporting hundreds of domain‑specific intents.

The article also discusses how the product team balances technical possibilities with cost, manufacturability, and user experience, illustrating decisions such as microphone array placement versus maintenance concerns and the trade‑offs of offering flexible wake‑word placement.

Looking ahead, JD DingDong aims to continue adopting emerging technologies, expanding its IoT ecosystem, and delivering richer services, positioning the smart speaker as a core component of JD's future technological strategy.