Headset jack eyes are gone | Mobile HiFi Road where

From the era of the functional machine, the concept of music phone already exists, relative to the current music phone is a bit crude, but at least from the appearance of the system showed a difference.

The concept of music phones seems to have peaked in 2016, with major handset vendors beginning to pile up audio chips in their handsets, regardless of sound quality, but at least we've seen a thriving scene.

Just as we all thought the phone HiFi will become the essential feature with the phone camera position, the 3.5mm headphone hole cancellation can be said to be a fan that intends to throw away the portable player, dumbfounded, and now look to cancel 3.5 mm headphone jack is very popular. Earphone hole is gone, the phone Hi Hi Fi?

Concerned about the phone's friends is not difficult to find, cancel the headphone manufacturers at the press conference did not mention decoding and op amp, and 3.5mm headphone jack seems to become a big selling point. Remove the headphone jack manufacturers, and sometimes will Conscience to consumers with an original adapter. Mobile HiFi really not? Today's fever school, we talk about, no 3.5mm headphone jack, the phone HiFi where to go from here.

Headphone hole cancellation stems from the trend of sorrow

Heard such a joke:

Phone maker A: I heard no, Apple to cancel the headphone jack, and we do not follow?

B cell phone manufacturers: that also wait what, we must follow, you see people music, people are the first!

Although it is just a joke, but have to say is that there is such a phenomenon to follow suit, headphone jack cancel really good? Not necessarily, but knock 3.5mm headphone jack is not the trend toward the obvious.

What is the benefit of removing the headphone jack?

1, increase the fuselage airtight.Removed a hole does have such a role, but in fact little effect, are generally excuses used by manufacturers to save money. Samsung Galaxy Note8 still have headphone jack, also supports IP68 level Waterproof and dustproof, headphone jack can also be done waterproofing.

2, you can make the phone thinner. Headphone hole 3.5mm, plus the reinforcement device, the chip will not exceed 7mm. Can save the internal structural space is true, but to improve the internal components of the stack design is often more effective than simply cancel the headphone jack More.

3, mobile phone accessories manufacturers are happy.

But canceled 3.5mm headphone jack has brought a bunch of things:

1, cell phone eyes no electricity, with charging treasure can not round while you listen to the song while charging the dream;

2, the original headset is broken, want to directly use the headset had to buy the same;

3, buy high-end headphones actually can not directly use, have to plug a adapter to use.

4, cancel the earphone hole did not see the phone carry water, the water is bad or bad;

Is the battery really big?

But these are not the most important. What is important is that, Professional audio chips are gone along with the 3.5mm headphone jack disappeared...

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No 3.5mm headphone jack phone HiFi it

I believe we all have such a problem: 3.5mm headphone jack is gone, the phone can HiFi? Why we can not see the professional audio chip on the phone with 3.5mm headphone jack canceled? In fact, these questions are not difficult to answer, as long as Let's first understand how the audio system works.

Simply put, the audio system is a process of decoding and amplification. The reason why decoding is necessary is that the song files stored in the phone memory are in digital format, but the real driving of the earphone coil is the analog signal.

In more detail, we play a song, and the processor delivers the file processing schedule to the audio decoder, which we call DAC (digital to analog signal decoding chip), and the digital signal is decoded into an analog signal Analog signal is very weak, after the amplifier to signal amplification to drive the headset, which completed a play process.

Then cancel the 3.5mm headphone jack to make this process what changed? Take Apple, iPhone Lightning data interface can only output digital signals, which means that the decoding and op-amp process are not completed in the phone So adding a separate decoding chip and a high quality op amp chip in a cellphone makes no sense, and a processor-packaged audio chip has enough cellular phone speakerphone.

However, there are two cases of this problem on Android phones because the complete Type-C interface can not only output digital signals but also output analog signals.If the audio output of an Android phone is an analog signal, Function is no different, this time decoding the op amp mobile phone itself has played a role; if the output is a digital signal, then decode the op amp is still in the adapter or dedicated earphone to achieve. So Android phone adapter or Type-C headphones are not necessarily universal, need to pay attention to the purchase.

So the cancellation of the earphone hole will affect the phone HiFi? Earlier, the mobile phone manufacturers introduced the Type-C earphones, focusing on the sound quality, saying that such earphones can avoid the interference of other circuits to the decoding opamps and make the sound quality more pure, but apparently the small earphone connector does not conform to the volume That is, sound quality 'wide recognition of limited space limited the performance of the chip and circuit layout, power supply and chip decoding capabilities are obvious problems.

To this end, I also find the adapter in the widely acclaimed HTC digital analog adapter audition, the phone equipped with Snapdragon mobile platform, audio SoC packaged chip solution with a 3.5mm headphone jack. From the sense of hearing , HTC digital analog adapter relative to the phone's decoding op amp, the sound is more condensed type, vocal gingiva improved, resolution also improved, but the overall increase are small, and not a qualitative leap.

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Bluetooth headset hard to carry the banner of mobile HiFi

Headphone hole disappears, people will naturally turn their attention to wireless Bluetooth headset. So Bluetooth headset can carry the burden of mobile HiFi it? A word to describe: difficult. In the audio circle, most of the people who listen to music with Bluetooth headsets are easy to use. Some also like to tune a certain bluetooth headset, and also pursue the noise reduction, but the real pursuit of HiFi sound quality with Bluetooth earphones is less The reason, we have to talk about the working principle of Bluetooth headset.

Bluetooth headset related to wireless transmission, it was said that the Bluetooth transmission rate affects the quality of Bluetooth headset in the first such explanation is not without reason, the transmission bandwidth is not enough means that there will be synchronized playback Caton.But in fact, Bluetooth to Now bandwidth is enough, the real impact of wireless transmission is the Bluetooth wireless standard transmission audio protocol. The transmission process is not directly to the audio file transmission, but through the encoder to compress the transmission.

At present, the main encoding types include SBC, AAC, aptX and LDAC. SBC has the best compatibility and the worst sound quality. AAC is relatively good. If the phone is playing AAC audio files, then AAC Bluetooth encoding can transfer less encoding AptX (code rate 384kbps, equivalent to high-quality MP3 code rate) is a higher Bluetooth audio encoding, aptX-HD (bit rate close to the common playback software In the lossless format) can get better sound quality performance.

LDAC encoding is Sony's proprietary encoding, supports high sampling rate of 24bit, while supporting 990kbps data volume, providing 24bit / 96kHz compression encoding data transmission and decoding, is the highest quality codecs. Android 8.0 will be compatible with this But for the real enthusiast, the amount of data is not enough 990kbps enough, FLAC 24bit / 96kHz typical compression coding rate reached 2350kbps or so.

Because Bluetooth is a digital signal transmission, so do not use the mobile phone decoder op amp.So in fact, Bluetooth headset is a self-contained system, which includes a wireless signal transceiver module, DAC, op amp and headphones. The image of that, which is equivalent to receive the digital signal Type-C data interface plus a Bluetooth headset receiver decoding module. Circuit size and limited power supply, Bluetooth headset sound quality performance can imagine.

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Anyway, HiFi mobile phone can go

3.5mm headphone jack is canceled, the phone HiFi is not really the end of the road? Actually not, since the phone can only output digital signals, so you can do a device for decoding and amplification. Is also a specialized decoder and headphone amplifier The original mobile phone HiFi limited to mobile space and power supply, it is difficult to achieve the ultimate mobile phone sound quality, and professional decoding and headphone amplifier there is no such concern, simply put, That's it With a certain degree of portability in exchange for more professional HiFi experience.

exactly , I recently purchased a flagship brand of decoding and headphone amplifier, so to find a variety of different prices of headphones to compare the experience.From the sense of hearing, one hundred headphone and adapter cable, integrated chip channel listening difference Not much.But the higher the quality of the headset is still more obvious difference.

Bass surging iron triangle IM70 with adapter cable to listen, bass and vocals easily paste together, and the decoder while ensuring the bass at the same time, and the human voice and other instruments can be well separated, the bass is no longer sloppy; Di M1221 obviously felt the lift, the rhythm more simply crisp, analysis also improved, the end result and the sound field also has a better performance; higher quality AKG K3003 sound enhance more performance in the rhythm of the atmosphere and the resolution of the details Take control.

Abandoned the quality of the headset itself does not say that the big ears and Sennheiser MOMENTUM mobile phone straight push can.But it can clearly feel the difference between the two front-end, headphone amplifier Sennheiser MOMENTUM showed more Good vocal cohesion and sound field. AKG K701 impedance larger mobile phone straight push very strenuous, barely promote, headphone amplifier push is even more relaxed.

For inconvenient users to use the cable can also be considered Data connection through Bluetooth decoding amp amp machine Although the quality of the data can not be compared with the direct link, but Have better decoding than the Bluetooth headset and op amp circuit, compared to simple Bluetooth headset sound quality will be better.

Write in the end

Limited to the structural space and circuit power supply, cell phone sound quality and professional player is still a significant gap, perhaps the original cell phone HiFi is a pseudo-proposition at the beginning, but fortunately, compared with ordinary phones have obvious sound quality improvement for early Voyeur audio frequency metaphorical path is still enough.

The 3.5mm headphone hole cancellation just broke the situation.Although the headset to reduce the convenience of use, but for the phone HiFi this may not be a bad thing, the use of specialized decoding and amp to promote the phone HiFi toward more professional The direction of development, but also play a role in promoting the prosperity of the surrounding industries.

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