Broadcast Fundamentals

Transcription

1 Broadcast Fundamentals Česká Televize Friday 12 December 2014 Tobias Habann Broadcast Systems Engineer

2 Dolby s History of Innovation noise reduction 5.1-channel digital audio surround sound for headphones 3D Digital Cinema 7.1-channel cinema sound 1965 Today home theater real-time 5.1 broadcast HD audio for PCs mobile entertainment Dolby Atmos TM cinema sound Dolby Atmos TM for the home

3 Redefining the Consumer Audio Experience Accessible Engaging Immersive Adaptable Audio Description, Dialog Enhancement Perfect for sports, live events, movies and interactive shows Lifelike experience Optimal playback on every device

4 Dolby Technologies in Broadcast

5 Dolby End to End Chain (Live Production)

6 Dolby Technologies in Broadcast Contribution Dolby E Transmission Lossless True HD (for BluRay) Lossy Dolby Digital (AC-3) Dolby Digital Plus (E-AC-3)

7 Dolby E Dolby E Support for Eight Channels Multichannel Audio for Live Events Frame-Accurate Audio Multiple Encode and Decode Carries Metadata

8 Dolby Digital Plus (E-AC-3) Dolby Digital Plus (E-AC-3) Bandwidth Savings (5.1 Surround Sound by 192 k/bits) Always Hear What the Director Intends (Through Metadata Support) Used to deliver Surround Sound via OTT Services Support of Audio Description Receiver Mixed Most Future Proof Codec on the market Decoders Implemented in almost all HD TV s on the Market in Europe

9 Dolby End to End Chain (Live Production)

10 Metadata Metadata is a set of parameters which controls the encoding of PCM into a multichannel compressed format such as Dolby Digital Plus (E-AC-3) and the decoding back to PCM. Operational metadata is any metadata parameter that is required for the Dolby Digital Plus decoder to reconstruct the audio samples. All other metadata parameters fall into the Informational metadata group. Informational metadata parameters might provide an indication to the playback system, or even to the end-user, but do not change the way the audio is decoded.

11 Important Dolby Digital Plus (E-AC-3) metadata parameters ialnorm: RC: ownmix: Indicates the long term A-weighted loudness level Leq(A) of the associated audio. Essential for proper loudness management. Selects predefined compression mode based on both the rendering equipment and the type of content. Essential for intelligibility and listening comfort Controls how a multichannel surround program will be rendered on Pro-logic, stereo or mono receivers. The secret of the Multiscreen Advantage hannel coding: Specifies the number of channels in the program and their physical arrangement. Essential for proper multichannel sound reproduction

12 Dolby Digital Plus is Backwards Compatible Device Muxed A/V file/stream Video Stream Dolby Digital Plus Audio demux AV DSP Video Decoder DD+ Decoder HDMI S/PDIF Analog Reference Specification: ATSC A/52B, Annex E ETSI TS , Annex E

13 Audio Description Broadcast Mixed Typically Main 5.1 and a Audio Description Bitrate and Spectrum Inefficient (similar to simulcast) Described Service unlikely to be a 5.1 service Main 5.1 PID A PID A Main 5.1 Downmix AD 2.0 ENCODE Main 5.1 PID B MUX DEMUX PID B DECODE Main 2.0+AD AD

14 Audio Description Receiver Mixed Encoder and Receiver must be carefully matched E-AC-3 Metadata update rate (timing) is sent in PID B Audio packets AD systems based on other codecs use PES packets Bitrate and Spectrum efficient (AD is a mono track) 5.1 mix capability with Dolby MS11 based receivers (2.0 in Dolby MS10) Main 5.1 PID A PID A Main 5.1 AD 1.0 ENCODE Main PID B AD MUX DEMUX PID B DECODE + Main 5.1+AD Mixing Metadata

15 Case-Studies

16 Dolby Digital Plus On-Air in Europe On-Air HEVC Trials DVB-T2 Berlin Germany UHD HEVC, Dolby Digital Plus DVB-T2 Munich Germany HD, HEVC, Dolby Digital Plus DVB-S2 Hispasat Spain 4K, HEVC, Dolby Digital Plus DVB-T2 Spain 4k, HEBC, Dolby Digital Plus DVB-S2 Astra France UHD HEVC Dolby Digital Plus On-Air DVB-T France, Spain, Poland, Serbia, Italy, Austria Monocast Countries were Dolby Digital Plus is in the terrestrial specifications Turkey, Austria, Slovenia, Slovakia, Czech Republic, Georgia, Poland, UK, South Africa, Nigeria

17 Next Generation Audio supported by Dolby Digital Plus Objects in Movies and Broadcast

18 Dolby Atmos Object Based Audio Base Audio Bed Static audio elements, with stirring base tones and rich audio textures + Sound Objects Moving around and above you in multi-dimensional space adds a height dimension not ever before present! = Real Sound Simulation Multi-dimensional audio that fully immerses you in the scene! A new approach to Audio Mixing and Playback: Combined approach of a channel-based audio bed and sound objects Content creators mix in a 3D space

19 Listening: Properties of Audio Objects What are Audio Objects: (many, short) audio clips Enriched with object-metadata Object properties: Number (ID) Position (X, Y, Z) Size (divergence, dimension) path (automatable) ProTools Plugin

20 Listening: Properties of Audio Objects

21 Dolby Atmos for the Home Official Launch September 2014 Deliverable via BluRay (True HD) and OTT (Dolby Digital Plus) today Dolby Atmos via Broadcast Dolby Digital Plus in the near Future Home AVR s already on the Market

22 Object-oriented Audio - Possibilities Static Rendering Audio objects are rendered in a fixed arrangement into a playback environment. Enhanced audio experience through: More creativity (precision & control) Full ambience, stronger impact Takes 3D surround into the room (away from the walls) Scalable playback, optimized for any playback environment

23 Object-oriented Audio - Possibilities Dynamic Rendering Audio objects are rendered in a user-customizable way into the playback environment. Possibility for a personalized audio experience: Barrier-free: audio-description, dialog intelligibility, multi-language Playback customizable to personal preferences by the audience! Pre-defined mixes (neutral atmosphere vs. in the fan block A/B, ) Activation/positioning of additional audio objects in living room (e.g. UGC, Skype, )

24 Redefining the Consumer Audio Experience Accessible Personalized Immersive Adaptable Audio Description, Dialog Enhancement, Multiple Modify the presentation to the listener s preference Put the consumer in the action and the venue Lifelike experience Optimal playback on every device Language

25 Let s define the future of Entertainment together

26 Links Mai 2014

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