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1. Dolby Digital Ex Vs Dts
2. What Is Dolby Sound

Surround sound is an integral part of the home theater experience, and with that, there are lots of surround sound formats in use, depending on your audio system's capabilities, speaker layout, and content.

Dolby Digital Ex Vs Dts

Probably the most used are formats that are part of the Dolby Digital family. In this article, we discuss three: Dolby Digital, Dolby Digital EX, and Dolby Digital Plus. These formats are commonly used on DVDs and streaming content and are also present as a supplemental selection in Blu-ray and Ultra HD Disc content.

What Dolby Digital Is

Dolby Digital is a digital audio encoding system designed for use on DVDs, Blu-ray, and Ultra HD Blu-ray Discs, and, in some cases, for TV broadcast and streaming content. This system provides efficient transfer for audio signals that may be composed of one, or more channels, that can be decoded by a home theater receiver or AV Preamp/Processor with a Dolby Digital decoder and distributed to one or more speakers.

Jun 07, 2012  The copyright is by Dolby Digital. If they want that I delete this video, I will do it immediately! New Compilation Dolby Atmos Trailers and Sound Test - Duration: 5:36. Sri charan 150,865 views. How can the answer be improved? Dolby Digital Plus is the next-generation audio technology for all high-definition programming and media. Built on Dolby Digital, the multichannel audio standard for DVD and HD broadcasts worldwide, Dolby Digital Plus was designed for the delivery formats of the future, but remains fully compatible with all current A/V receivers.

Almost all home theater receivers in use have a built-in Dolby Digital decoder and all DVD, Blu-ray Disc, and Ultra HD Blu-ray Disc players are equipped with the ability to pass Dolby Digital signals via a technique referred to as bitstream to properly equipped receivers for decoding.

Dolby Digital is often referred to as a 5.1 channel surround system. However, the term 'Dolby Digital' refers to the digital encoding of the audio signal, not how many channels it has. Dolby Digital may also be referred to asDD, DD 5.1, AC3

• Monophonic: Represented by one or two speakers. However, with two speakers, both reproduce the same sound so the sound will appear to come from the space between the speakers.
• 2-Channels: Represented by two speakers - one on the left and on the right front of the listening position.
• 4-Channels: Represented by four speakers - Two placed on the left and right front of the listening position, and two on the left and right, and slightly behind the listening position.
• 5.1 Channels: Represented by five speakers (left, center, right, left surround, right surround), and a subwoofer (.1)

Dolby Digital EX

The Dolby Digital EX format adds a third surround channel that is placed directly behind the listener. The means that it is a 6.1 Channel system.

The six channels are represented by six speakers (left, center, right, left surround, center back, right surround), and a subwoofer (.1.).

This means that the listener has both a front center channel and, with Dolby Digital EX, a rear center channel. If you are losing count, the channels are labeled: left front, center front, right front, left surround, right surround, subwoofer, with a surround back center. A home theater receiver with a Dolby Digital EX decoder is required to access the full 6.1 channel experience.

However, if you have a DVD, or other source content, that contains 6.1 channel EX encoding and your receiver does not have an EX decoder, the receiver will default to Dolby Digital 5.1. What it does is sort out the extra EX information and distribute/mix it within a 5.1 channel sound field.

Usually, this means that the 6th (center back) channel is placed into both the left and right surround channels as a mono signal, which in turn creates a 'phantom' rear center back channel without having to have a physical rear center speaker.

This is not as accurate as a setup that includes a dedicated rear center channel speaker as the output level can't be adjusted independently of the left and right surround channels, but you are still able to hear the sound that was originally encoded for the center back channel.

Dolby Digital Plus

What Is Dolby Sound

Dolby Digital Plus is a high definition digital-based surround sound format that supports up to 8-channels (7.1) of surround decoding. The channel distribution is as follows: front left, front center, front right, left surround, right surround, left surround back, right surround back, and subwoofer.

In addition, Dolby Digital Plus contains a standard Dolby Digital 5.1 bitstream that is compatible with standard Dolby Digital-equipped receivers. This means on a 5.1 channel receiver you will hear a 5.1 channel mix of the soundtrack, rather than a 7.1 channel mix. The surround back left and right channels are folded into the left and right surround channels.

Dolby Digital Plus is one of the several audio formats employed by Blu-ray Disc format. Dolby Digital Plus is compatible with the audio portion of the HDMI interface, as well as being applied in streaming and mobile audio applications. Dolby Digital Plus is also built into the Dolby Audio platform for Windows 10 and the Microsoft Edge browser.

Although Dolby Digital Plus has its own specific label designation, in many applications, Dolby Digital 5.1 and 6.1 (EX) are often referred to as just Dolby Digital.

No matter which format in the Dolby Digital family discussed above you have access to, the goal is to provide a room-filling surround sound listening experience that enhances the home theater viewing experience or a fuller audio experience from a compatible home theater receiver, PC, or portable device.

However, depending on your content and components, there are additional Dolby home theater audio formats to be aware of including Dolby TrueHD and Dolby Atmos.

From the biggest commercial cinemas to the smallest of home theaters, Dolby Atmos is one of the latest ways to get surrounded by sound -- now from above! While Atmos soundtracks will work with a traditional five-speaker-and-subwoofer (5.1) system, one of its main benefits is a greater ability to work with as many (or few) speakers as you have.

In this explainer I'll break down how Atmos works, why height speakers and upward-firing soundbars are cool and everything you've ever wanted to know about Dolby Atmos but never bothered to ask.

Making sound surround

To understand what makes Atmos different than, say, its direct predecessor Dolby Digital, let's first take a look at how sound is mixed for movies and TV shows.

Everything you hear in a movie, from the music to the voices to the sound effects, all gets mixed into specific 'channels.' For simplicity's sake, we'll say these channels going around the room are left front (L), center (C), right front (R), right surround (RS), and left surround (LS). Some more complex systems add a 'surround back' channel. All the low frequency noises go to the '.1' subwoofer channel.

So if two characters are speaking on screen, that gets mixed to the center channel. When the music swells during a dramatic moment, that's usually the front left and right channels. Zooming special effects might appear in the surround speakers. To an extent, this same mix also translates to the home. After all, if you have a 5.1 speaker system, you have all those same speakers.

Except… you don't. Not exactly. Where your speakers are, how powerful they are, and increasingly, how much range each has, varies greatly compared to a decent movie theater.

Atmos, for the most part, doesn't use channels. Instead, most sounds are treated as 'objects.' Instead of assigning a sound to a channel (and by extension, a speaker), Atmos lets filmmakers assign a sound to a place. Not 'left surround speaker' but 'left rear corner.' Not 'pan from left surround speaker to right sound speaker' but 'pan smoothly across the rear wall.' Not only does this give greater flexibility at the theater, but improves the experience in the theater and, potentially, at home.

Atmos is an end-to-end change in theater and home audio. The mixing is different, as we've discussed, but so is the decoding. At different theaters the number of speakers can vary dramatically, but Atmos will scale with them regardless. Most theaters have many speakers along the walls to ensure everyone gets the same-ish experience. With Atmos those speakers can be individually addressable and a sound designer can pinpoint the exact location in a theater where they want to place a sound. A smoother experience for everyone.

This includes the headline Atmos feature: height. With speakers hanging from the ceiling, sound engineers can now move sounds seamlessly over your head and all around. Done right, it's not only more convincing than before, but also less obtrusive. It's more natural, so you're less likely to notice the special effects and more likely to stay absorbed in the movie. And that's the point, right?

So what about the home?

Theaters are great and all, but most of us watch more movies at home. Let's get this out of the way first: obviously most people aren't going to install height speakers in their ceiling. That's fine because there are a growing number of speakers that either feature built-in height channels or fit on top of existing models. Imagine a standard tower or bookshelf speaker, but on top is an upward-firing driver that's addressed separately. These speakers bounce sound off the ceiling to mimic 'real' height speakers. I've heard a few of these and they work surprisingly well. Not as well as real height speakers, of course, but it works and it's a far simpler option if you aren't interested in installing speakers in or near the ceiling.

So yes, if you want to take advantage of Atmos you'll need new hardware. But Dolby Digital is still the default for everything, so this isn't a required upgrade. If you're not interested in Atmos, your gear will still work. Even if you get a 4K Blu-ray player with dual HDMI outputs to connect to your older receiver, it will still work if it doesn't have Atmos. It will just play Dolby Digital or Dolby Digital Plus track.

But if you want height channels, more channels or other benefits of Atmos, then you'll need a receiver that can decode it and a source that provides it. (Those sources include 4K Blu-ray players, some media streamers and some game consoles.) And you'll need Atmos content, of course, which we'll discuss in a moment.

To the right, you'll see a couple of Atmos home setup examples. At the top, specially designed upward firing speakers. Each is a traditional speaker but also has separate drivers that shoot sound to bounce off the ceiling. These are tuned so the bounced audio sounds correct to your ears. At the bottom, a soundbar designed to do the same.

Since you've got a greater number of possible speakers, how many could you have if you really wanted to go nuts? 24… plus 10 height speakers. Yep, 34 speakers if you want. You don't need to do that, of course. But if you've got a bunch of spare speakers and amps laying around and a room that can fit them, go for it.

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A handful of mobile devices, such as the Amazon Fire HD 8 and 10, also have have a version of the technology (called Dolby Atmos for Headphones) built in. Though those are stereo only, they're designed to simulate Atmos effects with any headphones.

Dolby uses a slightly different twist to describe Atmos home systems. Traditionally a '5.1' system has three speakers up front, two on the sides or in back, and a single subwoofer. If you added two height speakers, Dolby would describe this system as a '5.1.2' system. I'm not sure that will catch on, but if you see 'a 7.2.4 home theater' you can deduce that it's probably got three speakers up front, two on the sides, two in back, two subwoofers, and four height speakers.

All around

In addition to the gear, you'll also need Atmos content. That's actually pretty easy. If you're streaming you can find it on Netflix and VUDU. On disc it can be found on 4K and regular Blu-ray discs. It's even in a handful of video games including Star Wars Battlefront and Overwatch for PC and Xbox One.

Chances are if the movie is 4K, it's also Atmos -- though that doesn't mean it's in Atmos everywhere you can find that movie. It might be available with Atmos on the 4K Blu-ray, but not on Amazon, for example. Just keep in mind there won't be compatibility issues. If you buy a movie that features Atmos it will also have an audio track your current gear can play, minus the height channels.

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Is it worth upgrading all your gear to take advantage of Atmos? No. It's cool, but if you're not a home theater junkie this might be more money than you need to spend if you're nota taking advantage of it. When you're ready to upgrade anyway, chances are the gear you're considering will have Atmos. For example, most of our favorite receivers already work with Atmos. Prices start at around $400 for the Onkyo TX-NR575, but you'll need to spend at least several hundred more on a set of speakers such as the accompanying Atmos kit.

On the sound bar side it's a little more expensive still, with the LG SJ9 costing a cool $900. As a result, if you want to get into Atmos investing in a receiver and upgrading speakers as you go is the most cost-effective solution right now.

Got a question for Geoff? First, check out all the other articles he's written on topics like why all HDMI cables are the same, TV resolutions explained, LED LCD vs. OLED and more. Still have a question? Tweet at him @TechWriterGeoff then check out his travel photography on Instagram. He also thinks you should check out his best-selling sci-fi novel and its sequel.

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