What is Apt X headphone support: features and requirements

Many people complain that when listening to music through headphones, the sound quality is very poor. The problem does not concern the headphones, and not the phone, but the codec, which is responsible for transmitting audio signals. In modern phone models, a new apt codec has appeared, which is considered to be better than analogs.

What is apt x support in headphones

Apt is a technology that allows you to get the highest quality signal through bluetooth headphones. The essence of the technology is that it compresses sounds in the process of transmitting signals through the bluetooth pass-through channel.

When apt x support is needed in the headphones

Modern manufacturers of tablets and smartphones are making models in which there is no port for connecting headphones. Therefore, the lack of a jack requires looking for alternative ways to connect headphones. It is then that we need a system for transmitting sound without wires.

The second reason is that in headphones with wires, the sound quality is slightly lower. This is due to the fact that A2DP technology has a limitation on frequency transmission. Because of this, the sound of the files is slightly distorted. Apt is able to transmit sound signals without any deviations. Thanks to modern compression technology, only high-quality sound is transmitted through bluetooth. More and more people are choosing APT, so it has become widespread and widespread.

APT has two flavors:

1. apt Slowly transmits audio signals wirelessly. Thanks to this technology, with a combination of 16 bit sampling and 48 kHz sampling, 352 Kbps transmission is provided. These numbers are considered the norm for a high quality signal. Often compared to CD, and has almost identical characteristics. But aptX has one serious drawback - signal transmission is slow, so up to 50% of quality is lost in its process. Therefore, the sampling depth is two times lower than the normal value.
2. AptX HD. The sampling rate is the same, but the sampling depth is increased to 24 bits. This helps to increase the transmission speed, as a result, the sound becomes better. And thanks to LPCM technology, data transfer is practically lossless (sound quality almost reaches digital).

Attention! There are a large number of codecs. They are selected depending on the compatibility with the device and the technical characteristics of the latter.

Features and requirements

The most important requirements are independence from other programs and technology performance. A codec needs a lot of energy to download and transmit signals. Also, the load on the device itself is very high. Outdated versions of smartphones will not be able to support the codec, so you will have to use the usual drivers, but you won’t be able to evaluate the sound through APT. At the same time, modern models are already capable of supporting the codec.

The requirements related to apt support apply not only to the smartphone itself, but also to the headphones.

In order for the sound to transmit well through bluetooth, the following factors are taken into account:

1. Sampling. The higher it is, the less excess noise in the signal is transmitted (it is close to digital). The frequency range is higher, and the distortion disappears. Measured in kHz.
2. The totality of the sample. Responsible for sound resolution. Dynamics may increase, relative to increasing the range of various signals. Allows you to transmit more sounds of different frequencies. Measured in bits.
3. How fast is the data transmitted. It is the connection speed, and processes and transmits audio signals. In addition, the parameter shows the size of the information that is transmitted at some point. The higher the speed, the more information the device transmits. This improves sound quality. Measured in kbps.

Benefits apt x support in headphones

The codec is capable of compressing audio files with a bitrate of up to 352 Kbps. And if you install the Qualcomm modification - AptX HD, support for the 576 Kbps bitrate appears.

In order to transmit signals to the headphones, audio compression is used. The latter requires good headphone performance. Frequency varies from 10 to 22000 Hz. Therefore, the sound quality is almost identical to CD. But until it falls short of vinyl.

If you compare the technology with standard codecs in bluetooth, the latter have more disadvantages:

1. The mediocrity of the codec. Signal quality is slightly lower.
2. Communication is often interrupted.

For a high-quality signal, such a parameter is necessary. Technology helps to compress sound.