Dolby Headphone technology allows you to enjoy multi-channel programming with traditional stereo headphones, such as Dolby Digital or Dolby Surround encoded movies, you can feel the shock, true surround Sound effects. You can also get more natural sound effects when listening to stereo programs such as CDs and MP3s. For any type of program, you can enjoy a long time without fatigue.
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Dolby Headphones is a signal processing system that enables your stereo headphones to produce realistic sound effects from five speaker playback systems.
When you listen to a program using Dolby Headphones, the sounds that were originally presented in front of you will be presented in front, and the sounds that were originally presented around you will appear around you. These sounds will no longer be concentrated in the center of your brain.
In fact, Dolby Headphone technology can be applied to almost any product with a headphone jack – such as an audio product, a video product, or a video game product. You can use the Dolby Headphone logo on the product to identify whether the product is applied. Than headset technology.
<1> Speakers and headphones
When the sound from each speaker of a stereo system reaches your inner ear, it contains a set of spatial information generated by the acoustic conditions of the building and the physiological characteristics of your head and outer ear. This information allows your brain to position the sound and embody it as a sound field concept that seems to be able to place the performer in front of you, just like at a concert. (See Figure 1)
figure 1
　　
The headphones send the sound directly into your ear, without any spatial information like the playback of the speakers. The result is an unnatural straight-line sound field between your ears.
　　
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Figure 2 Traditional headphones listening
The left and right sound images appear directly next to you, and the middle sound image appears in your head. This "intracerebral" effect is unreal and can cause the listener to fatigue. It's already a lot of difficulty to portray convincing two-channel stereos through headphones—a challenge for the surround sound that usually requires five speakers to restore the show. The multi-speaker home theater system not only aligns the stereo image in front of you like a stereo system, but also integrates you into the acoustic atmosphere, giving you a “immersive†feel when you watch movies and TV (see Figure 3). ).
　　
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Figure 3 How multi-channel surround sound playback Dolby headphones work
When you are listening to a stereo or multi-channel home theater system, your ears will receive both direct sound from each speaker and multiple reflections from the room surface and furniture (as shown in Figure 4).
　　
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Figure 4 shows the mixture of speaker direct sound and room reflection sound
This mixture of direct and reflected sounds is different for each speaker in the system, depending on its location and your own location.
When you reach your ears, the sound from each speaker has unique characteristics. The characteristics of all the channels together make your brain feel like room size and sound conditions, speaker position and original signal. The spatial information contained in it.
Using powerful digital signal processing technology, Dolby Headphones can add features electronically to the original signal for each channel—two channels on a stereo program and up to five channels on a surround program. A speaker from a corresponding position that is correctly placed in a well-designed, excellent acoustic environment. In other words, Dolby Headphones create up to five virtual speakers in a virtual room.
The processor combines all of these multi-channel signal letters containing the "features" of each channel into two coded channels, that is, when the signals from these two channels are sent to your ears through a conventional stereo headset Contains a combination of features from direct and reflected sound from each virtual speaker (see Figure 5). Therefore, the auditory experience will be much more natural, and the sound seems to appear "outside the brain."
　　
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Figure 5 Listening with Dolby Headphones
Up to 3 "listening room" parameters
With its unique working style and powerful signal processing, Dolby Headphones have up to 3 different playback modes to simulate the acoustic characteristics of the corresponding real room:
The DH1 is a small, reverberant room that is also suitable for playback of movies and music recordings. It is the “reference room†for Dolby Headphones and is available on all products with Dolby Headphones.
The DH2 is a more "live" (or reverberant) room, perfect for listening to music.
The DH3 is a larger room, more like a concert hall or cinema.
DH2 and DH3 are optional and are not necessarily provided by some Dolby Headphone products. On products that offer these three modes at the same time, you can easily switch between them to choose a mode that suits a particular program category and suits your personal preferences.
Other advantages
Dolby Headphones are suitable for all listeners; no personalization or user-specific adjustments are required.
As with speakers, the basic sound quality improves as the quality of the headphones increases. But even some less expensive headphones can provide excellent Dolby headphones.
Unlike listening to traditional headphones, you can use Dolby headphones for a long time. Its natural externalization of the sound, and the elimination of echo, rendering and other human influences, so that it can prevent the listener from fatigue.
You always occupy the "best listening seat in the room" because the sound effects you hear are independent of variables such as actual room sound conditions, speaker placement and listening position.
Dolby Headphones Applications
Dolby Headphones are suitable for any stereo programming resource, from CD to MP3 files, and are also suitable for any multi-channel programming resource, whether it is Dolby Surround, Dolby Digital, PCM, MLP lossless compression or MPEG encoding. It can be built into almost any audiovisual product that provides a stereo headphone jack, including digital cable and satellite TV set-top boxes, VCR, DVD-VIDEO video players, DVD-AUDIO audio players, traditional and digital TV reception. Computers, personal desktops, laptops, portable stereos, game consoles, A/V surround decoders and receivers, car audio systems, and multimedia speaker systems.
Multi-channel products with built-in Dolby Headphone system to simulate multi-speaker surround playback, such as those with Dolby Digital 5.1 channel and/or Dolby Pro Logic / Dolby Pro Logic II decoding Dolby Headphone logo. This type of product can also perform Dolby Headphone processing on stereo programs. A Dolby Headphone Stereo stereo logo is used to simulate the stereo sound of two speakers using Dolby Headphone technology.
Simply plug in your favorite stereo headphones and enjoy the "best listening seat in the room".
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