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.[citation needed] It uses five full bandwidth channels and one low-frequency effects channel (the 'point one').[1]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.[2]
All 5.1 systems use the same speaker channels and configuration, having a front left and right, a center channel, two surround channels and the low-frequency effects channel designed for a subwoofer.
A prototype for five-channel surround sound, then dubbed 'quintaphonic sound', was used in the 1975 film Tommy.[3]
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.[4] 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.
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.[5]
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):[6]
Description: Very simple movie that lets you test the functionality of your system according to the specifications AC3, test of all 6-channel audio and surround effects.
Length: 0.48 min
OPINION Releaser
How often happen to have bubbi the operation of an audio channel? E ‘fault of the film we are playing or our plant?
With this simple tool loaded on a cd you get a chance to test it from your reader from the table and doing nothing from your PC (if you have the outputs 5.1), this is one of those tools than a screwdriver is useful to have hand even if not used frequently.
This test has no harmful frequencies (as others, if you want them just ask) for your plant.
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Download : TEST TOOL Ac3 Dolby Digital 5.1Ch Sound Test (video file for test surround effects)
Nome Codec Video: DivX 3 Low-Motion
Numero Frame: 1457
Frame (pixels): 576
Altezza frame(pixels): 432
Display Aspect Ratio ('DAR'): 1.333
FPS: 29.970
Video Bitrate (kbps): 2011
QF: 0.270
Windows 10’s Creators Update added support for Dolby Atmos positional sound. This includes two things: Support for Dolby Atmos hardware and virtual Dolby Atmos sound that works in any pair of headphones.
The Dolby Atmos for headphones feature is a bit weird. It appears in the standard Windows control panel as an option, but it requires a free trial or $14.99 purchase via the Windows Store before you can actually use it.
Traditional 5.1 or 7.1 surround sound uses 5 or 7 speaker channels, plus a subwoofer. When you watch a movie or play a game with surround sound, that movie or game is actually sending 6 or 8 separate channels of sound to your speakers.
Dolby Atmos is an improved type of surround sound. It isn’t mixed into several separate channels; instead, sounds are mapped to virtual locations in 3D space, and that spatial data is sent to your speaker system. A Dolby Atmos-enabled receiver then uses specially calibrated speakers to position these sounds. Dolby Atmos systems may include ceiling-mounted speakers above you or speakers on the floor that bounce their sound off the ceiling, for example.
This feature requires Dolby Atmos-enabled hardware, notably a Dolby Atmos-enabled receiver. Microsoft also just added Dolby Atmos support to the Xbox One, and many Blu-ray discs include Dolby Atmos audio.
RELATED:What’s the Difference Between Virtual and “True” Surround Sound Gaming Headsets?
Windows 10’s Creators Update also added a separate feature named “Dolby Atmos for headphones”. This feature promises improved positional audio in any pair of headphones or earbuds. You don’t need special Dolby Atmos headphones. It’s a type of virtual surround sound built into Windows.
Really, this is a completely different feature that’s only linked by Dolby’s branding. True Dolby Atmos requires a hardware receiver and special speaker setup, while Dolby Atmos for headphones is a digital signal processor (DSP) that takes surround sound from your PC and mixes it to offer an improved positional sound experience in headphones.
Some games have already added support for Dolby Atmos for headphones. For example, Blizzard’s Overwatch includes built-in Dolby Atmos support, and it works even if you’re not running Windows 10’s Creators Update. You can enable this feature from Options > Sound > Dolby Atmos for Headphones in Overwatch. Blizzard argues that Atmos offers an improved experience that allows you to more easily pinpoint where sounds are coming from in the game.
To start using this feature, download the Dolby Access app from the Windows Store and launch it.
The app will guide you through setting this up. If you have Dolby Atmos receiver you want to use with your PC, select “With my home theater”. If you want to use any pair of headphones, select “With my headphones”.
If you select a home theater PC, you’ll be given a link to enable the “Dolby Atmos for home theater” option in the Windows Sound settings control panel. After you do, the app will prompt you to calibrate your system. There’s no additional purchase necessary for the home theater option—you just need the hardware.
If you select headphones, you’ll be prompted to confirm your PC’s sound hardware supports the Windows 10 spatial audio platform for headphones. Modern PCs should have sound drivers that support this feature, but you may be out of luck if you have a much older PC you’ve upgraded to Windows 10.
The Dolby Atmos for headphones feature isn’t free. While Microsoft integrated it into Windows, Microsoft clearly didn’t pay the licensing fees to allow any Windows user to use it.
You can still try Dolby Atmos for headphones for free, however. Click the “30-day trial” button to enable it.
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Once you’ve enabled the free trial, you’ll be prompted to enable Dolby Atmos for headphones. Click the “Configure PC settings” button and then select “Dolby Atmos for headphones” in the Spatial sound format box.
This option actually appears in the properties window for your audio device even if you don’t have the Dolby app installed. However, if you try to enable this feature without installing the app first, Windows will prompt you to install the Dolby Access app from the Windows Store first.
The Dolby Access app will allow you to test Dolby Atmos by playing a variety of videos that support Dolby Atmos audio.
While the videos are impressive enough, you’ll want to actually test Dolby Atmos by playing some PC games or watching some surround sound-enabled videos before paying for it and see if you can notice an appreciable difference. Some people say they notice an improvement, while others don’t notice much of a difference. It likely depends on the games you’re playing videos you’re watching, too.
When testing Dolby Atmos, be sure to enable 5.1 or 7.1 surround sound in whatever game or application you use. The application will then produce surround sound, and Dolby Atmos will mix it to stereo sound for your headset.
You’re free to test Dolby Atmos for 30 days, after which it will cost $14.99 to buy Dolby Atmos for headphones support from the Windows Store.
Windows 10’s Creators Update also offers a free “Windows Sonic for Headphones” option you can enable instead of Dolby Atmos. Just right-click the speaker icon in your system tray, select “Playback Devices”, click your playback device, and click “Properties”. On the Spatial sound tab, select “Windows Sonic for Headphones”.
You may want to test this feature to see how it compares to Dolby Atmos for Headphones in your games and videos. We’ve seen some people say it doesn’t work quite as well as the Dolby Atmos option in their experience, but we’ve also seen some people say they don’t notice much of a difference.
When it comes to sound, everyone often has their own opinion. Audio quality can be very subjective.
So, let me get this clear. With the new version of the BBC HD Test Card, I should be able to see all 4 white/black dots on my TV - the white, white-than-white, black, and blacker-than-black.
So, let me get this clear. With the new version of the BBC HD Test Card, I should be able to see all 4 white/black dots on my TV - the white, white-than-white, black, and blacker-than-black.
If I understand correctly, then given the 'adjustment' Andy has made to prevent this broadcast testcard being accurate, making one of the white dots disappear will actually cause your TV to clip below peak white in a valid and legal video signal.No, the brightness should be adjusted until one of the black dots just disappears, then contrast adjusted until one of the white dots disappears.
Some LCD screens, especially the smaller sizes, are actually 16:10 panels, not 16:9.Andy,
Regarding adjusting the vertical/horizontal scan size, when I adjust the test card so that the tips of the arrows are just touching the edge of the screen, the circle doesn't seem to be truly round, I have to provide a little more vertical underscan to get a perfect circle.
Would this be something to do with the fact my display has a native resolution of 864 lines?
I never had problems when I use to adjust 4:3 displays using the 4:3 test card, using the same arrow method above?
Thanks
I've calibrated my tv using the blu-ray of HDBasics, so the only adjustment I need to make for my tv viewing is whether to have my Sky+HD box contrast setting set to low, medium or high. Medium looks just fine to me.
I recommend HDBasics to anyone wanting a good calibration of their tv.
Dave
Just checked Anytime this morning, to be greeted with the 'HD Christmas Test Card'! Fun!
Dave
Wow what a poor test card that is!
It doesn't appear to be aligned correctly the lip sync test isn't a very scientific calibration either (plus is seems to vary) and then the card seems to go to SD mode at the very end.
And yes, my TV looks perfectly aligned using the BBC test card.
Still, it's marginally better than no test card I guess
I wouldn't pay any attention to anything that card shows.Well I'm glad that with the santa card my new tv all looks good.
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