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How Bluetooth Headphones Work Part 2

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How Bluetooth Headphones Work Part 2

Bluetooth Aptx

Introduction to Common Abbreviations in English

aptX Bluetooth

NFC – Near field communication technology, Bluetooth headphones with this function can be quickly paired and connected by touching the playback device.

AAC: The technology provided by Dolby Laboratories is a high compression encoding algorithm. There is a lot of AAC audio in Apple Music and the sound quality is better than MP3 at the same bit rate. The iPhone will use AAC encoding for Bluetooth streaming. .

AptX – Qualcomm’s leading encoding technology, which is more efficient than traditional Bluetooth encoding and preserves more details in the sound. Most newer Android phones are equipped with AptX, but Bluetooth headsets must also be AptX-compatible to be effective.

LDAC – A Bluetooth transmission technology developed by Sony itself, which can transmit 3 times normal Bluetooth data and perform lossless music playback with Bluetooth, but only Sony devices support this technology.

Simply put, in terms of bit rate, AAC “AptX” LDAC. From the point of view of the audio source, if the player plays lossless music, the actual listening experience is AAC “AptX” LDAC, but since most users use network players such as NetEase Cloud or QQ Music, the source audio is mainly 128K. or 320K MP3, so there is no obvious difference in hearing between these encoding modes.

How to check if the phone supports aptx

Better to check the supported devices on the aptx official website.

APTX is a compressed streaming format that, while also lossy, can stream audio files with higher bit rates.

From a mobile phone point of view, APTX support requires mobile CPU support, but because this technology is paid, not all mobile phones have it. For example, Qualcomm Snapdragon 820 and 835 support APTX, but use Snapdragon 820. Mi 5 is Not Supported. Under normal circumstances, you can check for the APTX logo on the phone’s packaging:

Otherwise, you can call the after-sales consultation.

Of course, the safest way is to log into the APTX official website for inquiries. If submitting a link is not convenient for you, please use the official Baidu website. Go to the upper right corner of the official website and select Chinese, click Product search filter, the first is the brand, the brands in this list are compatible with aptx products (the list is sorted by English AZ , arranged vertically from left to right), the second One is the type of product: computers, mobile phones, headphones, speakers, etc. There are many types of products, the third is the aptx type, there are three types that are used in different fields. Please find your own brand and model of mobile phone, if it is not shown, it is not supported.

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How Bluetooth Headphones Work

How Bluetooth Headphones Work

Bluetooth Headphones

The decoder chip of the mobile phone decodes music files such as MP3, generates a digital signal and sends it to the Bluetooth headphones via Bluetooth;

Bluetooth Headphones

The Bluetooth headset receives the digital signal and converts it to an analog signal that the human ear can understand through the digital-to-analog conversion chip inside the Bluetooth headset;

To amplify the analog signal, you must use the signal amplifier chip inside the earphone;

The headphone unit receives the amplified signal and makes a sound, and at this time, the ear hears the sound of music.

Do Bluetooth headphones ring?

However, the sound quality of Bluetooth headphones has long been criticized. The saying “Bluetooth headphones hear a sound” often circulates in the enthusiast circle. There are two main reasons for this:

When Bluetooth transmits audio data, it performs lossy compression on the audio, which loses sound quality;

Digital-to-analog conversion and amplification is done inside the Bluetooth headset. It’s hard to do both at the same time in such a small size, so for the sake of portability and price, sound quality is sacrificed even more.

The second point is the main reason. After understanding the principle of Bluetooth headphones, we know that for Bluetooth headphones to work properly, it is necessary to install batteries, Bluetooth modules, digital to analog conversion circuits, amplifier circuits, headphones. units, etc. in the headphone shell Series components, testing the manufacturer’s product design capabilities and comprehensive technical robustness. However, accomplishing this step only satisfied the need to “express”. If you want good sound, you should also tune in. This link should check the specific sound performance of the headphones with different materials, different diaphragms and different cables. In short, it is a more complicated process and the main R&D cost of the manufacturer.

Simply put, Bluetooth headphones are the product of compromise thinking, in order to get rid of the headphone cable shackles and reduce some of the sound quality. However, from today’s point of view, the sound quality of Bluetooth headphones made by traditional headphone manufacturers is generally better (of course, the price is also more expensive), which can meet the needs of most of users in terms of the appreciation of music, and the low-priced Bluetooth headphones produced by small manufacturers are in fact can only “hear” it.

Sound via Bluetooth: versions and codecs, do they affect the sound quality?

Sound via Bluetooth: versions and codecs, do they affect the sound quality?

Bluetooth is a wireless technology that allows, among other things, to connect headphones or portable speakers, stereo systems or sound bars to your smartphone or laptop.

There are many devices on the market today with different versions of the Bluetooth protocol and with support for different codecs. What does all of this mean, which version is the latest, we need to understand all of this, and most importantly for us, does this somehow affect the sound quality? Let’s see.

One important thing to keep in mind up front is that the Bluetooth sound technology you hear has much less impact on sound quality than the design of the device itself. If you try to test multiple wireless headphones or speakers, you will hear the obvious differences between the devices. If you test the same device, but connected with different codecs or versions of Bluetooth, the difference may not be so obvious, maybe even subtle.

Simply put, you should not base your choice solely on the Bluetooth technologies and codecs supported by the device, this is neither the first nor the second most important criteria.

Bluetooth versions

Bluetooth has improved dramatically over the years since the turn of the century, and audio compression isn’t as brutal today as it was in the days of Bluetooth 1.1 or 2.0 (when wireless headphones and earphones first hit the market). ). Let’s highlight the main technical differences between the Bluetooth versions, devices with which they can be found for sale today.

Bluetooth 3.0: The data transfer rate has increased significantly (up to 24 Mbps vs. 2.1 Mbps in Bluetooth 2.0), but the power consumption has increased.

Bluetooth 4.0: reduced power consumption while maintaining a speed of 24 Mbps.

Bluetooth 4.1: added anti-crosstalk protection when working with LTE modules installed on all 4G smartphones.

Bluetooth 4.2: higher speed and improved data transmission security.

Bluetooth 5.0: range increased 4 times, speed increased 2 times.

Bluetooth 5.1: it was possible to determine the location and direction with the utmost precision.

As you can see, the new versions primarily address data rate and power efficiency issues, which rarely directly affect sound quality. However, newer versions can improve data transfer reliability, which can allow a heavier codec, such as aptX HD or LDAC, to run at higher data rates.

So to summarize:

The Bluetooth version generally does not directly affect the sound quality.

Both devices must support the Bluetooth version and specific codec.

The difference between different codecs on the same device can be subtle.

AAC is only meaningful to Apple, not of interest to Android.

aptX and other codecs, on the other hand, are not supported by Apple devices.

Wireless technology shouldn’t be an important consideration when choosing an audio device. Don’t automatically rule out headphones without the latest Bluetooth version or with SBC only, they may sound better or be more comfortable than their competitors.

What you need to know about listening on Bluetooth headphones

What you need to know about listening on Bluetooth headphones

Harald Bluetooth IBluetooth is the wireless transmission of data between two devices in a short distance. This is done using radio waves (WPAN).

Few know that the name of Bluetooth technology comes from the name of the Danish king Harald Bluetooth I (958 AD). It was he who brought together parts of Norway and Denmark. And the Bluetooth symbol itself denotes the Scandinavian runes B and H.

So to transfer music via Bluetooth 3 factors are required:

Sampling frequency (kHz): the higher the sampling frequency, the clearer the sound can be transmitted (closer to digital). Distortion in sound is reduced and the audible frequency range is widened.

Sampling depth (bits): The higher the sampling depth, the higher the resolution of the music. Dynamics increases as the range between soft and loud sounds increases. In this way, it is possible to obtain more subtle sound levels and tonal nuances.

Bit rate (kbps) – This is the connection speed at which music audio data is transmitted from the device to the headphones. However this is not entirely true. More precisely, this value indicates the possible size of the amount of data transmitted at a given time. The higher the baud rate with the Bluetooth headset, the more data (at the same time) the device can transfer. Therefore, the audible sound is greatly improved.Better Bluetooth audio: what aptX, aptX HD and LDAC are all about

What do the abbreviations aptX, pptx HD, and LDAC mean?
These abbreviations are for Bluetooth codecs and mainly describe various transmission parameters. They differ in sample rate, sample depth, and bit rate. Android 8.0 devices support these audio codecs and you can enjoy better sound quality.

atpX is the slowest option for wireless music streaming. This technology provides a maximum bit rate of 352 kilobits per second at a sample rate of 48 kHz and a sample depth of 16 bits. The analog signal is read 48,000 times per second and stored with 16 bits. In principle, these are solid numbers. In comparison, a CD is read and stored with identical parameters. However, relatively slow streaming results in a nearly 50% loss in audio quality. So the sampling depth is only 8 bit, which is related to the resolution of the music.

The AtpX HD also has a sample rate of 48 kHz, but the digital signal is stored at 24 bits. The dynamic range is increased, resulting in higher quality sound. The use of LPCM (Linear Pulse Code Modulation) results in lossless data transmission from analog to digital signal. The sound is thus clearer.

PCM is a modulation technique that converts an analog signal into digital. The CD receives the analog sound waves from the music recording.

Best Bluetooth audio: what aptX, aptX HD, and LDAC are all about
Sony H. EAR on wireless
It is not yet known to what extent the bit rate in this codec is adapted only for the best sound transmission in headphones.

Sony’s LDAC Bluetooth codec is the best and fastest of the three wireless audio capabilities.

At data rates of less than 1 Mbps at a sampling rate (96 kHz) and a sampling depth of 24 bits, almost CD quality is achieved.