This allows the AC-4 data stream to be edited/spliced at video frame boundaries to maintain synchronization without the need to decode and re-encode the audio. A/V Frame Alignment: AC-4 is the first emission audio format that allows the audio frame sizes to precisely match the video frame size.Advanced Accessibility: Service providers can easily and efficiently deliver secondary audio in 5.1 surround sound for the visually impaired without doubling the file size or bitrate.Advanced Dialogue Enhancement: End-users can have control of the dialogue level in relation to other sounds in the programme - suiting individual hearing needs and preferences.It acts across a wide range of devices and applications (home theatre to mobile) and can be configured to align with numerous worldwide standards and/or recommendations. Intelligent Loudness: Fully automated loudness management means more precise control and eliminates problems with cascaded processing.Solving several key issues currently facing the industry, the main benefits of AC-4 include: Users will be able to hear what the football match sounds like from the stands or the field and experience the kind of sound that transports them right to the centre of the action, whether they are playing a game or watching a movie. AC-4 enables new, more immersive and personalized consumer audio experiences in the future. The specification meets modern entertainment requirements with features to simplify the synchronization of audio and video, to take into account adaptive streaming, complex audio sets, and a very rich support for metadata.”Īfter the widespread and popular AC-3 format, the AC-4 audio codec standard, ETSI TS 103 190, is designed by industry experts to go beyond providing simple compression efficiency. “ AC-4 is designed to be an advanced standard for both audio for video and audio-only delivery. “ Our broad representation of industry stakeholders in ETSI allows us to offer new solutions as technologies and consumer usage evolve”, says Simon Fell, Chair of ETSI Broadcast Technical Committee. New advanced features are designed for the multi-channel, multiple devices environment of our “digital natives” era.
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