Things to Consider When Choosing Bluetooth Headsets

 With the development of Bluetooth headset technology, more and more terms are flooded with it, which brings a lot of trouble to the purchase. I hope this article can clear the fog and let more people understand whether these parameters are useful to find a Bluetooth headset that suits them.

1. Brand

（1）Bluetooth headsets derived from mobile phone manufacturers

The brand is well-known and has a large fan base. Such as Apple, Huawei

（2）Traditional acoustic equipment manufacturers, mostly international brands, with technology accumulation, are relatively mature. Such as: SONY, JBL, Audio-Technica

（ 3） Newly emerging domestic brands

Rely on high-cost performance to highlight products, such as 1more, display

2. Sound quality

Common Bluetooth headset evaluations will use artificial ears to obtain the frequency response curve of the headset. The disadvantage is that the ear canal structure of real people is different, so artificial ears cannot represent the public’s hearing experience.

In terms of sound quality, it is still necessary to listen to more.

3.noise reduction

（1）Passive noise reduction: Relying on the silica gel of the earplugs to isolate external sounds. Advantages: no effect on sound quality, disadvantages: the effect is not very good

（2）Active noise reduction: relying on the active algorithm of the headset, when the external sound is collected, the reverse sound wave is simulated to achieve the effect of canceling the noise. By measuring the sound attenuation value when the active noise reduction is turned on and off, the sound attenuation is The larger the value, the better the noise reduction; see the table in the New Commodity Library for details.

（3）Call noise reduction: filter the sound received by the microphone, leaving only the human voice frequency band, and at the same time perform echo reduction processing on the listening sound.

4. the principle.

The source of the sound depends on the vibration.

（1）Moving coil earphones: Relying on the film + guide coil inside the earphone as the vibration source generates vibration and produces sound. (The structure of the moving coil unit is too small, and the force generated is not enough to make the coil drive the diaphragm to do low-frequency vibration, and the bass effect will be poor. Of course, it is not absolute. There are also moving coil headphones with small size and good sound quality)

Advantages: large sound field

Disadvantages: large volume, small volume, poor bass performance (the music performance of heavy bass such as rock, jazz, etc.)

（2） Moving iron earphone: The inner voice coil is on the iron sheet in the center of the magnetic field, and the iron sheet under the action of the magnetic force drives the diaphragm to emit sound. (Generally used for high-end headphones, even with double-balanced electric drive, it can achieve studio-quality sound)

Advantages: low distortion, high sensitivity, small size

Disadvantages: high cost

5.Bluetooth

Bluetooth is a technology for short-distance communication between devices.

Bluetooth version at this stage

L2.0, L2.1, L3.0, L4.0, L4.2, L5.0 (2016-06-16), L5.1, L5.2