2002 Educational Workshop - Prague John Salzman, DMX Inflight Al McGowan, TEAC

2002 Educational Workshop - Prague Audio Programming and Technologies Why audio technologies? Document the process Creation of a reference model Review of audio technologies Digital Audio Compression Content Loading

2002 Educational Workshop - Prague Hours of Stereo Audio Content

2002 Educational Workshop - Prague Audio Programming and Technologies Review reference model Overview of audio compression Discuss content loading methods

2002 Educational Workshop - Prague Audio Programming and Technologies Breakout Discussions: New Strategies in Audio Programming: Audio System Quality and Reliability: MP3 and Next Gen. Audio Reproducers:

2002 Educational Workshop - Prague Audio Working Group Reference Model Audio Jacks Head Set Technology

2002 Educational Workshop - Prague Audio Encoding John Salzman, DMX Inflight

2002 Educational Workshop - Prague Analog Waveform

2002 Educational Workshop - Prague Studio Master 24-Bit Resolution Digital Approximations 48,000 per second

2002 Educational Workshop - Prague Sample Rates Higher Sample RateLower Sample Rate

2002 Educational Workshop - Prague Studio Master Quality 24-Bit Resolution 48,000 Samples per Second MSBLSB CD Audio 16-Bit Resolution 44,100 Samples per Second MSBNew LSB LSB Trun-ca-tion: to cut off; to cut short

2002 Educational Workshop - Prague Point of Reference CD Audio Bitrate is 1411 kbps

2002 Educational Workshop - Prague Compact Disc-Interactive First Digitally Compressed Audio Format Used for IFE 4 Bit Resolution, 37,800 Samples per Second Utilizes the Adaptive Delta Algorithm CD-I Bitrate is 151 kbps Records the Change in Value Between Samples

2002 Educational Workshop - Prague By-products of Compression Algorithms Rapid Decay of Diminishing Tones Loss of Harmonic Ambiance Clinical, Lifeless Sound These Effects Vary from Song to Song

2002 Educational Workshop - Prague CD Stereo L Only R Only L eft/ R ight C ommon L eft R ight Channel 1 Channel 2 Channel 1 Channel 2 Joint Stereo L Only R Only L Only R Only

2002 Educational Workshop - Prague Bit Resolution 3 BIT 128 kbps 4 BIT 192 kbps 6 BIT 256 kbps 16 BIT 1411 kbps

2002 Educational Workshop - Prague Effect of Bit Resolution Same Sample Rate 3 Bit Resolution Bit Resolution

2002 Educational Workshop - Prague MP3 Pro Next Generation of MPEG Layer 3 Codecs Offers MP3 128 kbps Quality at 64 kbps Backward Compatible Developed within the MPEG Standard NOT Backward Compatible with Layer 1, 2 or 3 Higher Quality at Lower Bitrates AAC-Advanced Audio Coding

2002 Educational Workshop - Prague Bitrate Recap 24 BIT Master 2300 kbps 16 BIT 6 43 CD 1411 kbps MPEG at 256 kbpsMPEG at 192 kbpsMPEG at 128 kbps 4 CD-I 151 kbps

2002 Educational Workshop - Prague Use the Highest Bitrate Possible Depending On: Storage Capacity Available Amount of Content Offered System Download Characteristics Processor Speed Size of Pipeline Onboard

2002 Educational Workshop - Prague WAEA Written to Specify a Method of Equalizing Dialogue Levels with Sound Effects and Music The Intent is Still Current, the Method is Outdated Revise the Standard to Incorporate: MPEG-4 AAC Dolby Digital Beta / VHS Hi-8 File Server

2002 Educational Workshop - Prague Audio Working Group Reference Model Audio Jacks Head Set Technology

2002 Educational Workshop - Prague Preparation of Digital Content Encoding (Compression) Creation of Metadata Encoding of Elementary Streams Multiplexed into system or transport streams if required by the system Transferred to DDS2 DAT tape DAT tape sent to Integrator to load onto Data Loader

2002 Educational Workshop - Prague Replication of Optical Media CD (CD-I)  CD-I Encoder creates CD replication master  CD’s are replicated/burned CD-R  Distributed to Airline 4 per aircraft DVD (MPEG 1 Layer 2 or Layer 3)  DVD master is created from MPEG files  DVD’s are Replicated/burned DVD-R  Distributed to Airline or Integrator

2002 Educational Workshop - Prague Distribution of Optical Media CD  Typically 4 per A/C installed in the EE Bay by airline mechanics monthly DVD  1 per A/C  Location EE bay or VCC  Downloaded then removed  Stays on A/C for background Loading

2002 Educational Workshop - Prague Distribution of Digital Media “The Sting” Portable Data Loaders  Dedicated Data Loaders Expensive / Faster / Easier  Laptop Computers Inexpensive / Slower / Flexible

2002 Educational Workshop - Prague Distribution of Digital Media “The Swap” Exchange of Hard Disk Media  Remove and Re-Rack File Server Expensive / Fast / Easy  Remove and Re-Install Hard Disk Less expensive / Fast / Easy

2002 Educational Workshop - Prague Distribution of Digital Media “Manna from Heaven” Satellite Delivery Gate Link

2002 Educational Workshop - Prague Data Requirements in GB

2002 Educational Workshop - Prague Speed of Digital Transport Streams

2002 Educational Workshop - Prague Time to Load 35 Hours Audio (2GB)

2002 Educational Workshop - Prague Time to Load 30 Movies (60GB)

2002 Educational Workshop - Prague

Breakout Discussions: New Strategies in Audio Programming: Peter Barsby, SKYLINE Jon Wheat, DMX Inflight Audio System Quality and Reliability: Kevin Munday, MASC, Geoff Underwood, Inflight Peripherals MP3 and Next Gen. Audio Reproducers: Bryan Rusenko, Crest National John Salzman, DMX Inflight Al McGowan, TEAC

2002 Educational Workshop - Prague Audio Programming and Technologies New Strategies in Audio Programming: Peter Barsby, SKYLINE, Jon Wheat, DMX Inflight

2002 Educational Workshop - Prague Audio Programming and Technologies Audio System Quality and Reliability: Kevin Munday, MASC, Geoff Underwood, Inflight Peripherals

2002 Educational Workshop - Prague Audio Programming and Technologies MP3 and Next Gen. Audio Reproducers: Bryan Rusenko, Crest National John Salzman, DMX Inflight Al McGowan, TEAC