ipDTL

ipDTL is an IP codec running in a Web-browser and used for remote broadcasts in television and radio, as well as voice-over.[1] It is a replacement for classic ISDN audio codecs, with which it has backward compatibility. It is also capable of video transmissions and can be used in the field with some mobile devices.[2]

History

ipDTL was invented by former BBC sound engineer Kevin Leach and utilizes the open-source codec OPUS since it first became available in the Google Chrome web browser.[3] It enables higher audio quality than ISDN by accessing a website through a web browser.[1] Audio quality of 72 kbit/s mono for voice contributors,[4] 320 kbit/s for outside broadcasts with music, and 3 Mbit/s video at 1080p for video contributions on TV programs are possible.[1] Leach launched the technology in 2013 as an initially free service for radio stations, but shifted to a subscription model shortly after.[5]

Overview

ipDTL utilizes the WebRTC and Web audio technologies. It is designed primarily for Blink-based browsers like Google Chrome or Opera and runs on all platforms except iOS where these browsers are supported. The codecs used are Opus for audio and VP8 for video. The supported audio bandwidth is up to 320kbit/s (stereo), and up to 3Mbit/s for video (1080p).[1]

Connections are DTLS-encrypted and established point-to-point.[3] Where a point-to-point connection is not possible, TURN relay servers are used to route the audio. TURN servers in the US, UK, Brazil, Australia and Japan are available, with an independent backup system being maintained at ipdtl2.com. Connections can also be made through a special URL that allows users to access another account and connect with it.[1] ipDTL uses a proprietary signaling method but also supports SIP for interoperability with other devices and applications such as Comrex Access and Media5-fone, and can transcode between Opus, G.722 and G.711.[6] It also supports interoperability with legacy ISDN hardware via cloud based bridging servers.[7]

ipDTL powers hybrIP - a talk show system - which allows screening calls using any computer.


See also

References
  1. Sparrow, Mark (12 November 2014). "Could ipDTL spell the end of ISDN for broadcasting and voiceovers?". Forbes. Retrieved 17 February 2015.
  2. "Interview: Kevin Leach, In:Quality - remote broadcasting". Asia Radio Today. Retrieved 17 February 2015.
  3. Jackson, Will (14 November 2014). "Cheap, easy remotes via Internet". Radio World. Retrieved 17 February 2015.
  4. Williams, Neil. "How to do a voiceover using ipDTL". Neil Williams Voice Over Artist. Retrieved 19 April 2017.
  5. Martin, Roy. "Technical Innovation Award for InQuality". Radio Today. Retrieved 17 February 2015.
  6. Cunningham, Steve (1 April 2014). "Test Drive: ISDN Replacements - ipDTL". Radio and Production Magazine. Retrieved 17 February 2015.
  7. King, Rana (13 October 2015). "ISDN with ipDTL for Voice Over Actors Now Possible". Voice Over Herald. Retrieved 1 September 2016.
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