Accompanying a lot of smartphones from 2018 to remove the 3.5mm jack, the headsets using USB-C jack also came out in the hope of replacing the sound connection of “rice”. this. If you don’t feel ready to venture into the world of wireless headsets, listening to music directly over a USB-C connection will be the best alternative. Here’s what you need to know before you get familiar with this new connection standard, including both technical and practical.

Overview of USB-C Audio and the object it targets


USB-C connection is the latest solution today to replace the 3.5mm jack that is no longer & quot; weighted & quot; on new smartphone models too. This standard of course still has its own pros and cons, which is why we need to evaluate whether it is worth using or not. Audiophile people often do not rely on USB-C connection because the compatibility is not high, however, users are not interested in this issue very much, especially when some smartphone companies (like Google limited) usually include 1 pair of USB-C headphones for your phone when opening the box, this helps customers to listen to music immediately without any additional cost. In general at the present time, USB-C connection serves as a new solution for those who do not like or are not ready to switch over using wireless headsets. The undeniable advantage of wired connection is that there will never be interference, delay or charge after a period of use.

USB-C Audio
working protocols


There are two ways for a mobile device to transmit signals via a USB-C port. The first way is passive (or it can be called analog output) which is the DAC circuit available on the phone that will decode the digital audio signal and convert it into an analog signal (normal headphones use the signal). analog signal) and direct analog signal transmission to USB-C port. The adapter cord (or headset) will receive an analog signal and passive transmission to the headset driver, at which time the USB-C port has a mechanism that works exactly the same as the usual 3.5 mm port just different from the port. connect. That is, the adapter cord or headphone cord only needs to be able to play the music normally without the need for special pins. The representative representative is Bphone and Motorola (the big weakness is the noise level is much higher than the normal 3.5mm port). Why? Since it extracts analog signals from the entire smartphone circuit, which is from CPU processing, ARM CPUs often have very high noise when running so bad listening is obvious. I found that there are many models of USB-C only about 300k 400k 500k but it will not write USB-C Active or Passive, we can do calculations, a DAC chip and a DSP circuit is also more than 250k- 300k already so the price is 500k for a headset OnePlus/a> and demanded that it has a good DAC circuit, it is good to hear that it cannot : D .

The other way is also the common way that mobile phones use them to output digital signals directly via USB-C port. This way of exporting digital audio signals directly through the USB-C port and completely removing the DAC or Amp circuits inside your phone (any phone has a DAC and Amp to output the sound. Integrated speaker on the phone). This also means that the audio decoding task depends entirely on the DAC /Amp circuit built into the adapter or headset. Most good USB-C headset products now have a DAC /Amp chip integrated on the cord. This also makes sound quality depend entirely on the quality of the adapter or the decoder circuit of the headset. Usually these headphones will be available when the line of symbols, showing decoding parameters such as “24bit /96kHz & quot ;, like that.

Audio Adapter Accessory Mode


Audio Adapter Accessory Mode is the name of a protocol that allows USB-C port to transmit analog audio signals directly to accessory devices like 3.5mm adapter. Most headsets with USB-C jacks support this mode of communication to passively stream music from the phone’s DAC /Amp or decode actively through the DAC /Amp circuit directly. on headphones. However Audio Adapter Accessory Mode is something that phone manufacturers can choose to apply uniform standards or not to save costs. On these USB-C male and female ports there are 4 pins to ensure analog audio transmission (Left audio, Right audio, Microphone, and Ground). If both the source device and the end device support this standard, you can safely use it to listen to music because this is a unified standard. In addition to these four pins, Audio Adapter Accessory Mode can support two more connection pins so that the phone device can charge with a maximum current of 500 milliamp.

If your phone supports Audio Adapter Accessory Mode, even if the USB-C to 3.5mm adapter is cheap, if you have a support certificate, you can be sure to use it. Along with this standard, you want to use 2-split adapters and chargers while listening to music. If your phone does not support Audio Adapter Accessory Mode, the ability to ensure compatibility is a good idea to buy its adapters. Or expensive adapters and clearly write compatible phones, otherwise with the current inexpensive cheap adapters, the compatibility is hard to guarantee. If you intend to buy an Android smartphone without a 3.5mm port and still want to use your high-end 3.5mm headset, you should learn more about that phone first, as well as Audio output modes are compatible with adapters or refer to other wireless receiver solutions.

USB-C audio: is there any improvement in 2019?

This is hard to say. While USB-C headsets are getting more and more attention, this is not enough to conclude what the future of USB-C audio will be. At CES this year, the USB-C earphones appear quite a bit, along with the 3.5mm jack rumors that will be revived on the expected smartphones such as Huawei P30 or Sony Xperia XZ4, from there. The more users consider whether to invest in a USB-C headset or not.

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