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Blog Central

Ken Tankel

Recent Posts

Audio over IP and the Future of Television

Posted by Ken Tankel on Oct 29, 2015 12:00:00 AM


Video and audio were handled separately for years before SDI video with embedded audio came into use.  Embedded audio appeared to be a step forward.  The reality is that embedded audio has not reduced lip sync issues and metadata is still easily separated from the audio that it describes.  This is particularly unfortunate because metadata will become more essential with new audio services.  Audio embedding and de-embedding was never perfect and it remains limited.  SDI is, at heart, a video format and it cannot support the future of audio.  Channel based audio is heading for replacement by carriage of the objects that make up the channels.  Multiple languages, emergency audio, and services for the blind are all competing for space in broadcast services.  These expanded audio services provide flexibility and enhanced consumer experiences for broadcast and OTT services and even handheld devices.  AES67, Livewire+ and related standards offer a path to making all of this work – including lip sync!  AES and SMPTE are working together, and the results will enable the sub-sample accurate linking of Audio over IP (which has existed in radio for over a decade and is growing in TV) and video, all without requiring it to be glued together until final delivery.

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Topics: AES67, Audio over IP, AoIP for Television

How Do You Measure Up?

Posted by Ken Tankel on Jul 9, 2014 9:00:00 AM

Over the past several years, the worldwide attention of audio loudness in television broadcasting has grown and it’s now common knowledge that both proper audio measurement and loudness control are required in all aspects of content delivery. Today, there is a new international standard for measuring loudness. Knowing what it is, and understanding how to use it, are critical steps in making reliable and useful loudness measurements.

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Topics: Audio Loudness