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Glossary

Phase

In audio systems it's sometimes desirable to have one or more channels out of phase with the other channels. In practical terms it means a delay between a sound being played on the front speakers of a Surround Sound system and the back.

The big advantage to having the Surround channels out of phase with the front channels is that they don't interfere with one another. Since surround speakers may be pointed nearly directly at front speakers they'll often have a tendency to interfere with one another if fired in phase. By having the signals slightly out of phase (generally 90 degrees) the risk of interference is alleviated.

For more information, see the glossary definitions for:

Discrete Surround Frequency Matrix Surround

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Lossless AR ARccOS ARIA ARIB Artifact ASF Asian Silvers Aspect ratio ASPI ASV ASVOBS ASX ATA ATAPI ATI CrossFire ATIS ATRAC ATRAC Advanced Lossless ATRAC1 ATRAC3 ATRAC3plus ATSC Audio Frequency Modulation AUDIO_TS Authoring Automatic Fine Tuning Automatic Frequency Control Automatic Gain Control Automatic Iris Autoplay AVC AVCHD AVI AVS B B Frames B-CAS Back Surround Back Surround Channel BAE-VX1000 Bandwidth BayTSP BCA BD BD+ BD-25 BD-50 BD-J BD-Live BD-R BD-RE BD-ROM BDA BDAV BDMV BDRip Bescherming Rechten Entertainment Industrie Nederland Betacam BetaCrypt 1 BetaCrypt 2 BetaMax Betamax Case BFF Bidirectional Prediction Big Champagne BIN/CUE Images Bink Birefringence BISS Bitrate bitsetting Bitstream BitTorrent Blindread BlindWrite Bloatware Block Blocking Blu-Code Blu-ray Blu-ray Disc Blu-ray Disc Association Bluetooth 3.0 Bonus View Book A Book B Book C Book D Book E BookType Bootlegs Bots Bottom Field First BPI bps BREIN British Phonographic Industry British Phonographic Industry Broadcast Flag BRrip BSA BT5 BT6 BUP Burst Cutting Area BWA BWS BWT bz2 bzip2 C C2D CA CABAC Cable Television CableCARD CableLabs Cam Camcorder Canadian Motion Picture Distributors Association Caption Capture CAS CATV CAV CAV/CLV CAVLC CBHD CBR CCD CCE CCI CCIR 601 CD CD+G CD-DA CD-i CD-MRW CD-Plus CD-R CD-ROM CD-ROM XA CD-RW CDA CDI cdma CDMA2000 CDR CDV cDVD CE-ATA CeBIT CEC CECB CEDIA Expo Cell Center Center Channel CES CGA CGMS CH-DVD Channel Chanserv Chaoji VCD Chapters CHDA China Blue High-Definition Disc China High Definition DVD China High Definition DVD Industry Association China Video Disc ChinaCrypt Chipset Chroma Chroma Subsampling Chromaticity Chrominance CIF CISO CLI CloneCD Control File Closed Captions Closed GOP CLV CMF CMI CMPDA Coaster Codec CodecSys Codicrypt Color Graphics Adapter Color Space Colorimetry Colorspace Combo Drive Command Line Interface Common Interface CompactFlash Component Video Composite Video Compression Conax CAS 5 Conax CAS 7 Conditional Access Conditional Access Module Conditional Access System Constant Bitrate Constant Quality Container Content Protection Technical Working Group Control Area Copy Guard Management System CoreAVC CoreAVC Video Codec CoreCrypt CorePNG CPPM CPRM CPSA CPTWG CRB CRIA Cropping CrossFire CrossFireX CRT Crypton Cryptoworks CSO CSS CTI-CAS Cue cue file Cue Sheet CVD D D-VHS D1 DAA DAE Daemon DAO DAR Darknet Dashboard DAT DAX DCC DCC Get DCC Send DCF DCT DCT Block DDC DDoS Decode Deep Color Deinterlace Delta Frame Demultiplexing Demux Descriptive Video Service DigiCipher 2 Digital Artifacts Digital Rights Management Digital Video Recorder Digital8 DiMA DIMM DIRAC Direct Access Archive Direct Stream Digital direct-to-video Direct2D Direct3D DirectDraw DirectInput DirectMusic DirectPlay DirectPlay Voice DirectSetup DirectShow DirectSound DirectSound3D DirectX DirectX Audio DirectX Graphics Infrastructure DirectX Media DirectX Media Object DiscJuggler Discrete Cosine Transform Discrete Surround Disk Copy 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In-Loop Deblocking Indeo Initial Standard Profile Instant CD/DVD Disc Image Institute of Electrical and Electronic Engineers Interlace Interleaved Video Units Interleaving INTERNAL International Federation of the Phonographic Industry International Telecommunication Union Interpolation Inverse Telecine ipsw IRC Irdeto Irdeto 1 Irdeto 2 IRMA ISO ISO 13818 ISO 21000 ISO 9660 ISO Zipped IsoBuster ISZ ITU ITU-R BT.601 IVTC J JEDEC Jitter Joint Video Team Joliet JSO JVT K Kad Kademlia Kell Factor Key Frame KeyFly KVCD Kxploit L LabelFlash Lagarith LAME LaserDisc Layer Break LCD TVs Lead-in Lead-out Leech Leecher Left Left Channel Left Surround Left Surround Channel Legos Letterbox LFE libavcodec Lightscribe Limited Line Pair Linear PCM Linear pulse code modulation Lines of Horizontal Resolution Lines of Resolution Lines per Picture Height Linux Liquid-crystal display televisions LiquidHD Logistep Lossless Compression Lossy Compression Low Frequency Effects Channel LPCM Lucky and Flo Luma Luminance Luminosity M M-JPEG M1V M2V M3U M4A M4IF M4V Macrium Reflect Macroblock Macroblock-Adaptive Frame/Field Coding Macrovision made-for-video MainProfile@H-14 MainProfile@HighLevel MainProfile@MainLevel Mandatory audio Mandatory Managed Copy manufacturer ID Manufacturing On Demand Matrix Surround Matroska MBAFF MCGA MD Data MD5 MDA MDA Card MDF file MDLP MDPA MDS file MediaGuard 1 Mediaguard 2 Mediaguard 3 MediaMax Megapixel Memory Controller Gate Array MFTP miCard MicroSD microSDHC MID MIDI MIDI Committee of the Association of Musical Electronic Industry MIDI Manufacturers Association MiniDisc miniDV miniDVD miniSD miniSDHC MIPI MKV MMA MMC MMCA MMCmicro MMCmobile MMCplus Modchip Monkey's Audio Monochrome Display Adapter Mosquitoes Motion Estimation Motion JPEG Motion Picture Association Motion Picture Association of America Mount Rainier MOV Moving Picture Experts Group Moving Pictures Expert Group MP MP+ MP2 MP3 MP3 plus Graphics MP3+G MP4 MP@H-14 MP@HL MP@ML MPA MPAA MPEG MPEG Advanced Audio Coding MPEG-1 MPEG-1 Audio Layer III MPEG-1 Layer II MPEG-2 MPEG-2 AAC MPEG-2 Layer II MPEG-2 NBC MPEG-2 Packetized Elementary Stream MPEG-2 Program Stream MPEG-2 PS MPEG-2 Transport Stream MPEG-2 TS MPEG-21 MPEG-4 MPEG-4 ASP MPEG-4 Industry Forum MPEG-4 Part 10 MPEG-4 Part 2 MPEG-4 SP MPEG-7 MPV MRIMG MRW MSU Lossless Video Codec Multi-Angle Multi-Color Graphics Array Multi-pass encoding MultiMediaCard MultiMediaCard Association Multiple Program Transport Stream Multiplexing Multisession Musepack (MP+) Musical Instrument Digital Interface Muxing mux_rate N NAB Nagravision Nagravision 3 Nagravision Aladin Nagravision Cardmagedon National Association of Broadcasters Native Resolution Navigation Stream NDS NDS VideoGuard NDSL Neotion SHL Neotioncrypt Nero Digital Nero Digital AVC New Technology File System NFO Nickserv Nintendo DS Nintendo DS Lite Nintendo DSi Nintendo DSi LL Noise NRG NTFS NTSC NUKED Nyquist Frequency Nyquist-Shannon Sampling Theorem NZB O O&O DiskImage OEM Ogg Ogg Media Ogg Tarkin Ogg Theora Ogg Vorbis OGM OMA OMG OmniCrypt On The Fly on the fly encryption Open Captions OpenFT OpenGL OpenMG Opposite Track Path OptimFROG OptimFROG DualStream Original Equipment Manufacturer OTA OTFE OTP Over The Air Overburn Overlay Oversampling oversizing Ovi P P-CAV P-frame P2P Pack Packed Format Packet PAL Pan & Scan PAR Parallel ATA Parallel Track Path Partial CAV Partial-Constant Angular Velocity Partimage PARTIMG PARTIMG.BZ2 PARTIMG.GZ Partition PATA PDI PDMI PDP PDVD Peer-to-peer Period Personal Video Recorder PGC Phase PicAFF	Picture Element Picture In Picture Picture Outside Picture Picture-Level Frame/Field Coding Pillarbox PIP Pit Pixel Pixel Aspect Ratio Place Shifting Planar Format Plasma display Playstation Portable Playstation Portable Slim and Lite POP Portable Device Media Interface PowerPoint Slideshow PowerVu PowerVu+ PPS PPT PQDI PQI Pre-shared Key Presentation Stream Profile Profile 1.0 Profile 1.1 Profile 2.0 Program 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