Redmi K40/Pro Dolby Atmos dual speakers produce sound in all directions

Redmi has since officially announced that it will unveil the Redmi K40 series via live video at 19:30 on February 25. According to the company, this event is a “dual flagship” live broadcast. This sparks speculation that the event will see the launch of the Redmi K40 and Redmi K40 Pro. Today, Redmi also announced that it fully upgrades the Redmi K40 series sound quality. This series comes with support for Dolby Atmos. According to the company, whether it is built-in stereo speakers or headphones, it unleashes sound from all directions.

Redmi K40 Pro

Redmi K40 series Dolby Atmos working principles

Furthermore, Redmi showcased the Dolby Atmos technology principles. It emphasizes that the dual speakers can produce surround sound in all directions. With Dolby Atmos, the device can render any sound effect as a single audio element. This audio output is independent of other parts of the audio track. Whether it is a child’s yelling, or a helicopter taking off, content creators can accurately separate the sound effect. Users can handle audio elements anywhere in the three-dimensional space without interference. 

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The headsets and built-in speakers of mobile devices are mostly left and right channels. In order to create realistic height and surround sound perception, a two-channel mobile system should first have a head-related transmission function (HRTF). HRTF describes how incoming sound sources from different locations around us reach our ears.

Depending on the position of sound emission, one ear may lag behind the other to perceive the sound. This means that the quality of sound on each ear may be slightly different. These differences stem from the interference on the listener’s head, torso, and outer ears. 

Dolby Atmos improves audio quality

Streaming Dolby Atmos mixing supports up to 128 simultaneous audio objects. It also contains metadata that describes the location of each object in space. Furthermore, the Dolby Atmos processor on the mobile device can apply a variety of HRTFs to the metadata to reproduce the spatial information in the stereo signal. When listening through headphones, the stereo soundtrack can accurately simulate theater sound effects (including the upper sound effects), creating a breathtaking and spatial experience.

To reproduce the same experience through the built-in speakers of the device, additional processing is required. In addition, speakers will produce a natural “crosstalk” phenomenon in our ears, which is not conducive to simulating multiple channels. Dolby Atmos processor can eliminate this crosstalk, and then apply HRTF to produce a multi-dimensional sound field and audio object movement effect.

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