Yaad Grewal June 8, 2016 at 3:52 PM. I have denon avr-x1200w 7.2,I have lots of problems with it.first of all I want to clear,I have yamaharx-v375 5.1,I bought denon 1200 just to enjoy movie dts,dd 5.1,7.1 and other sound effects,I updated Dts-x on denon1200 and download movies with dts 5.1 sound,got blue ray player 3d Samsung,but I m not happy with the sound m getting,surround effect is not. And i have a Dolby Home Theater 5.1 cinematic surround sound build in.It has 6 speakers in total and which one of them is the TUBA subwoofer. But the problem is windows 7 doesn't support it. I only get 2 front speakers to work. But before on Vista everything worked great i had surround sound and everything. And now its all gone.
(Redirected from 5.1 Surround Sound)
Most common speaker configuration for 5.1; used by Dolby Digital, SDDS, DTS, THX, and Pro Logic II. Each black square depicts a speaker. The centre speaker in the top line of the square is used for dialogue. The left and right speakers on either side of the centre speaker are used to create stereo sound for music and other sound effects in the film. The left and right rear speakers create the surround sound effect.
5.1 surround sound ('five-point one') is the common name for six-channel surround sound audio systems. 5.1 is the most commonly used layout in home theatre.[1] It uses five full bandwidth channels and one low-frequency effects channel (the 'point one').[2]Dolby Digital, Dolby Pro Logic II, DTS, SDDS, and THX are all common 5.1 systems. 5.1 is also the standard surround sound audio component of digital broadcast and music.[3]
All 5.1 systems use the same speaker channels and configuration, having a front left and right, a center channel, two surround channels (left and right) and the low-frequency effects channel designed for a subwoofer.
- 2Application
History[edit]
A prototype for five-channel surround sound, then dubbed 'quintaphonic sound', was used in the 1975 film Tommy.[4]
5.1 dates back to 1976[citation needed] when Dolby Labs modified the track usage of the six analogue magnetic soundtracks on Todd-AO 70 mm film prints. The Dolby application of optical matrix encoding in 1976 (released on the film, Logan's Run) did not use split surrounds, and thus was not 5.1. Dolby first used split surrounds with 70mm film, notably in 1979 with Apocalypse Now. Instead of the five screen channels and one surround channel of the Todd-AO format, Dolby Stereo 70 mm Six Track provided three screen channels, two high-passed surround channels and a low-frequency surround channel monophonically blended with the two surround channels.
When digital sound was applied to 35 mm release prints, with Batman Returns in 1992, the 5.1 layout was adopted. The ability to provide 5.1 sound had been one of the key reasons for using 70 mm for prestige screenings. The provision of 5.1 digital sound on 35 mm significantly reduced the use of the very expensive 70 mm format. Digital sound and the 5.1 format were introduced in 1990, by KODAK and Optical Radiation Corporation, with releases of Days of Thunder and The Doors using the CDS (Cinema Digital Sound) format.
5.1 digital surround, in the forms of Dolby Digital AC3 and DTS, started appearing on several mid 90s Laserdisc releases, with among the earliest being Clear and Present Danger and Jurassic Park (the latter having both AC3 and DTS versions). Many DVD releases have Dolby Digital tracks up to 5.1 channels, due to the implementation of Dolby Digital in the development of the DVD format. In addition, some DVDs have DTS tracks with most being 5.1 channel mixes (a few releases, however, have 6.1 “matrixed” tracks). Blu-ray and digital cinema both have eight-channel capability which can be used to provide either 5.1 or 7.1 surround sound. 7.1 is an extension of 5.1 that uses four surround zones: two at the sides and two at the back.
A system of digital 5.1 surround sound has also been used in 1987 at the Parisian cabaret the Moulin Rouge, created by French engineer Dominique Bertrand. To achieve such a system in 1985 a dedicated mixing console had to be designed in cooperation with Solid State Logic, based on their 5000 series, and dedicated speakers in cooperation with APG.[5] The console included ABCDEF channels. Respectively: A left, B right, C centre, D left rear, E right rear, F bass. The same engineer had already developed a similar 3.1 system in 1973, for use at the official International Summit of Francophone States in Dakar.
Application[edit]
Channel order[edit]
The order of channels in a 5.1 file is different across file formats. The order in WAV files is (not complete) Front Left, Front Right, Center, Low-frequency effects, Surround Left, Surround Right.[6]
Music[edit]
Suggested configuration for 5.1 music listening.
Regarding music, the main goal of 5.1 surround sound is a proper localization and equability of all acoustic sources for a centered positioned audience. Therefore, ideally five matched speakers should be used.
For play-back of 5.1 music recommendations of the International Telecommunication Union (ITU) have been released and propose the following configuration (ITU-R BS 775):[7]
- five speakers of the same size for front, center and surround
- identical distance from the listeners for all five speakers
- angle adjustment regarding viewing direction of audience: center 0°, front ±22.5° for movies ±30° for music, surround ±110°
See also[edit]
References[edit]
- ^'Surround Sound Examined: 5.1 vs 7.1 vs Virtual Surround - Tested.com'. Tested. Retrieved 6 June 2019.
- ^'Understanding Surround Sound Formats'. Crutchfield.com. 23 September 2009. Retrieved 7 March 2011.
- ^'What is 5.1'. Archived from the original on 17 March 2012.
- ^Mosely, John (January 1977). 'Quintaphonic Sound'. Journal of the SMPTE. l86.
- ^'Recherche & Développement'. Archived from the original on 3 August 2008. Retrieved 17 December 2015.
- ^'Multiple channel audio data and WAVE files'. Retrieved 19 November 2015.
- ^Thomas Lund (1 September 2000), Enhanced Localization in 5.1 Production, Audio Engineering Society, retrieved 19 November 2015
Retrieved from 'https://en.wikipedia.org/w/index.php?title=5.1_surround_sound&oldid=932248642'
HE-AAC Channel ID
This bitstream contains:
- Spoken Channel Identification in English
- BLITS (EBU Tech 3304-4.1)
- EBU Multichannel Ident (EBU Tech 3304-4.2)
- Narration in the following channels:
- FL
- FC
- FR
- RS
- LS
HE-AAC Bitstream:
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Original Wave File:
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AAC-LC Channel ID
This is the test above encoded in AAC-LC. Note this is 320 kb/s, not 160 as announced.
AAC Bitstream:
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HE-AAC Channel ID - With H.264 Video
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This is the bitstream above multiplexed with an explanatory graphic encoded in H.264 Main Profile at 800x600 resolution.
LFE and SBR Test
This tests for proper bass management and reproduction of the SBR portion of the HE-AAC bitstream.
This bitstream contains:
- Bass Management - 63 Hz tone @ -18 dBFS, 2 seconds
- Left Front
- Center
- Right Front
- Right Suround
- Left Surround
- LFE (@ -28dBFS)
- SBR - 6, 8, 10, 12 kHz tones @ -18 dBFS, 0.5 seconds each
- Left Front
- Center
- Right Front
- Right Suround
- Left Surround
- Spoken Channel Identification in English
- Narration: Center channel
There is a 1 kHz -18 dBFS tone in the center channel throughout.
AAC Bitstream:
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Original Wave File:
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If a subwoofer is used with limited-range main speakers, all 60 Hz tones should play at the same level through the subwoofer. (Hold SLM next to subwoofer) If full-range speakers are used, the 60 Hz tones should play through each speaker individually, though levels may vary due to standing wave or resonances in the listening rrom. The LFE signal is encoded 10 dB lower to account for the 10 dB gain in the LFE channel in the playback amplifer's bass management circuits.
If the decoder supports SBR, all four tones, 6, 8, 10, and 12 KHz should be heard (or seen on a sound level meter if you have high-frequency hearing loss). If the decoder is only decoding the AAC-LC portion of the bitstream, only the first two tones will be heard. This is at the encoded bitrate of 160 kb/s, at other bitrates the SBR crossover frequency used by the encoder will vary, resulting in more or less tones being heard. Missing tones in only one channel may indicate a speaker problem.
LFE and SBR Test - With H.264 Video
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This is the bitstream above multiplexed with an explanatory graphic encoded in H.264 Main Profile at 800x600 resolution.
Troubleshooting
The MPEG-4 AAC audio bitstreams above are presented as HTML5 audio objects - which should play back correctly in:
- Microsoft Internet Explorer 9+ (Win 7+ PC)
- Apple Safari 5+ (Win 7+ PC)
- Google Chrome (Win 7+ PC, Mac OS, Android)
when your computer has 5.1 channel speakers connected or connects via HDMI to a 5.1 or better surround sound AVR or home theater system. Note that many browsers and media players (particularly on mobile devices such as the iPhone) will output a stereo downmix from these streams, even if they don't support multichannel output.
The bitstream files, if downloaded locally, should also play correctly in:
- Microsoft Windows Media Player 12 (Win 7+ PC)
- Apple QuickTime (Win 7+ PC or Mac)
- VLC Player (Win 7+ PC)
No sound or no rear channels? Check the troubleshooting page.
7.1 Channel Support
The AAC codec family has supported up to 48 channels of audio since its initial development through predefined channel configurations and a flexible escape mechanism. The predefined channel configurations from the 2005 version of the AAC standard are shown below, along with the additional configurations standardized in Amendment 4 of the AAC standard in 2013 shown in cyan tint:
Channel Configuration Value | Channnels | Speaker Mapping | Common Use |
---|---|---|---|
0 | Escape Code | ||
1 | 1 | Center | Mono |
2 | 2 | Left, Right | Stereo |
3 | 3 | Center, Left, Right | |
4 | 4 | Center, Left, Right, Surround | |
5 | 5 | ITU BS.775-1 | |
6 | 5.1 | ITU BS.775-1 | 5.1 Surround |
7 | 7.1 | SDDS | |
8-10 | Reserved Value | ||
11 | 6.1 | ||
12 | 7.1 | 7.1 (a) of ITU BS.2159 | Blu-ray |
13 | Reserved Value | ||
14 | 7.1 Top | 7.1 (d) of ITU BS.2159 | |
15 | Reserved Value |
AAC Channel Configurations. Values 8-15 were added in AAC Amendment 4
This channel configuration value is specified in the AudioSpecificConfig structure of the AAC bitstream. When the channel configuration value is set to 0, the channel configuration is not predefined, but is explicitly described in the Program Config Element structure. This allows arbitrary channel configurations to be used. (For information on these structures, refer to the Fraunhofer Application Bulletin AAC Transport Formats or to the MPEG AAC standard: ISO/IEC 14496-3.)
Supplying the 7.1 configuration with the PCE escape method was necessary since the only predefined 7.1 configuration was the theatrical SDDS speaker configuration of five front speakers and two surround speakers. Thus, the more common BluRay 7.1 configuration with three front speakers and four surround speakers was specified using the PCE structure.
An amendment (ISO/IEC 14496-3:2009/Amd 4:2013) to the AAC standard also allows signalling the BluRay 7.1 configuration in the channel configuration field by using the value 12. An AAC decoder is also required to continue decoding configurations sent in the PCE.
More importantly, AAC lacked profiles requiring 7.1 support, with a level 4 or level 5 decoder only required to support 5.1 decoding. The amendment includes level 6 to require 7.1 decoding. Also, the amendment specifies a method for controlling the downmixing of 7.1 channels to 5.1 channels with controlled gains, much as the existing standard does for 5.1. The amendment also includes the extra loudness metadata currently specified in DVB into the AAC specification.
7.1 Channel Identification
Spoken Channel Identification per ISO/IEC 23001-8, 48 kHz sampling rate, AOT = 5, 224 kb/s, explicit signalling, backwards compatible, BluRay 7.1 configuration signaled with PCE.
AAC Bitstream:
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Original Wave File:
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Support of 7.1 channel bitstreams is relatively new and might not be available on many decoders. This bitstream is provided for verification of 7.1 decoder implementations.
As of 2017, Google Chrome is able to successfully play this bitstream on Windows 7 computers and Safari is able to successfully play this bitstream on Mac OS computers.