Gone are the days when phone makers would pack in a really loud speaker into a smartphone and call it a “music phone”. Lately, audio and music playback in smartphones has improved significantly. This has everything to do with the powerful new hardware chips that handle audio playback and the improved algorithms, that process sound better than ever before.
In a smartphone, the audio is processed by digital-to-analogue (DAC) converter hardware. So it’s important to understand the difference between analogue and digital audio. The music we have heard over the years, on vinyl records or cassettes, came from an analogue source. CDs and MP3 marked a shift to digital formats. In the latter, your digital music is saved as 0s and 1s, just like any digital data. DAC hardware understands those 0s and 1s and converts them back into the melodies they are supposed to be.
However, not every phone has the same DAC hardware. That is why the sound may vary even if you’re using the same app, music file, earphones or speakers. Some phones have a dedicated DAC chip, while others rely on the chip integrated with the rest of the processing hardware. If you are looking for a smartphone with great audio, look for one with a dedicated DAC chip.
Some examples of dedicated DAC hardware include the ES9218 Quad DAC in the LG V20, which has a built-in headphone amplifier to negate the audio-detailing loss during transmission. Similarly, the Samsung Galaxy Note 5 has the Wolfson DAC.
However, two phones with the same audio chip don’t always have the same level of audio output either. How well a phone maker optimizes the audio chip’s software algorithm plays an important role.
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While some phones use the audio codecs that come by default with the processing hardware, phones that are positioned for music lovers tend to use the overlay of better-tuned codecs.
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