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. 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. 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. 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). ). Figure 3 Multi-channel surround sound playback How 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). 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." 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.
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