The video entertainment feature on mobile devices continued to gain popularity among consumers in 2011. According to data released by Nielsen, the number of Americans watching videos on mobile devices in 2011 increased by 41% compared to 2010. In light of this rapid growth, mobile device developers and manufacturers are racing to market the next generation of tablets and smartphones, and the well-designed multimedia features are eye-catching. These mobile device platforms present more than high-resolution screens and more vibrant displays to consumers, and manufacturers have developed numerous audio innovations.
Today's mobile devices are truly portable devices with many features that most consumers could not have imagined 20 years ago. Manufacturers focus on features such as voice and high-speed data connections, email, SMS, security, durability, screen quality, web browsing, and more and more applications, but never too much for the entertainment experience. attention.
For a long time, being able to share a YouTube video with a smartphone or watch a news clip at the corner of the street waiting for a taxi is enough to satisfy the average consumer. However, today's consumers are looking for a more satisfying, higher quality mobile infotainment experience. As most of the video and data quality issues are resolved, the next mobile frontier challenge is enhanced audio output.
Fortunately, audio quality loss due to the physical limitations of modern ultra-thin designs can be retrieved through digital signal processing. With proper application, the DSP audio algorithm can effectively solve core playback problems such as very thin woofer, lack of sound clarity, failed imaging (flat sound) and insufficient speaker power.
Audio clarity limit
Bass is an accelerator of excitement and passion that expresses any entertainment experience. The latest innovation in low-frequency enhancement technology is the use of DSP algorithms to boost low frequencies so that even the smallest speakers can reproduce natural heavy bass. This algorithm can restore the perception of the main low frequency tones by dynamically enhancing the harmony. Improved bass performance for a fuller, more exciting listening experience.
Humans perceive sound in three ways. Our ability to position sound depends on the principle that sound waves from the same source differ from each other when they reach the left and right ears. We rely on specialized audio input information—the frequency change, volume intensity, and delay of the sound as it reaches our ears—to determine the location of the sound and the type of sound field image, or the listening environment in which we listen.
When digital entertainment or data consumed by a smartphone or tablet is frequently interrupted by background noise, the user typically attempts to manually adjust the volume to compensate. But this adjustment is inaccurate and can ruin the real listening experience. Human hearing is not a purely mechanical process. In fact, every time the user operates the volume control button, the application of psychoacoustic concepts is involved.
Psychoacoustics is a science that studies the psychological and physiological responses of humans to sound. It believes that human listening to sound is a sensory and sensory event. Our ears work with the brain to ignore certain sounds and perceive other sounds in a unique way.
Developers can use physiological acoustic models to determine which parts of the digital audio signal can be removed without significantly degrading the perceived audio quality. In other words, this model can suggest which parts of the content should be added or enhanced to improve the listening experience.
Portable entertainment is becoming a social experience where consumers can share their favorite movie clips or audio videos around a phone or tablet when they meet up with friends. This use case can convert the handheld listening experience from the initial dependence on the headset to the reliance on small screen speaker playback, with multiple listeners sitting around the device. However, slim, narrow speakers, earpieces, or earphones cannot reproduce multi-dimensional sound fields with high fidelity. Most small speaker components used in small mobile phones have significant performance limitations and can only play back squeezing, dull sound.
Today's devices are clearly not ready to provide the audio experience that consumers demand. Audio technology companies are working hard to develop technologies that can greatly improve the listening experience.
Immersive sound
So-called 3D audio is quickly gaining popularity among manufacturers and is used to enhance the music listening and gaming experience on mobile devices. The audio environment can be extended with 3D audio technology to provide users with an immersive, multi-layered, surround sound listening experience.
A number of vendors are currently developing advanced audio technologies that analyze and process frequency, volume, and latency while taking into account physical changes such as the distance between the listener's headphones. This processing technology delivers an exceptional surround sound experience on stereo speakers and headphones. This is a first-class, simple alternative that greatly improves the user's listening experience.
There are other techniques that dramatically increase the perceived volume level, so music, movies, and games can be resounding, clear, and robust to truly restore the artist's original intent.
In addition, audio technology developed for smartphones is designed to enhance the audio frequency band, thereby improving the audio quality of conversations and speech, and widening the studio with the emulation center channel to improve its clarity and audio quality.
With innovative DSP algorithms, manufacturers can now maximize the acoustic power of small audio speakers without the expense of additional BOM hardware, enabling better products with higher consumer price competitiveness.
Figure 1: Device manufacturers such as LG have integrated advanced audio technology into new models.
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