How to easily broadcast your music wirelessly

Bluetooth is a short-range wireless transmission technology, which allows the exchange of data, including audio, between different fixed or mobile devices (computers, smartphones, tablets, speakers, amps, televisions, headsets, etc.)

Bluetooth wireless link: what’s the point?

Ideal for removing cables between a computer or video game console and its peripherals (keyboard, mouse, PS4 and Xbox One controllers, printers, etc.), this technology is also booming with the democratization of mobile telephony. Low power consumption, Bluetooth is indeed particularly suitable for the wireless connection of nomadic devices. Initially confined to wireless headsets for hands-free telephony, this mode of transmission has quickly spread to the musical field and is now found on many wireless stereo headphones as well as on speakers and channels dedicated to phones. Laptops and tablets.

When does Bluetooth technology date?

Invented in 1994 by engineers from the Swedish communications company Ericsson, Bluetooth technology owes a lot to military research on transmissions initiated since the 1940s. Since 1998, several manufacturers have joined forces with Ericsson to work on their respective devices using this technology, forming the Bluetooth SIG (Special Interest Group), a group that ensures the development of technology. Several standards followed one after the other, bringing with them a lot of improvements, especially in terms of data throughput.

Where does the Bluetooth name come from?

In English, Bluetooth means “Blue Tooth”. Thus was nicknamed the Danish king Harald I (Harald Blatand, “blue tooth” in Danish) which united in the tenth century the kingdoms of Denmark, Sweden, and Norway. By analogy, this name has been given to this technology developed in a Nordic country and designed to allow electronic devices of different origins to work together.

Invented in 1994 by engineers from the Swedish communications company Ericsson, Bluetooth technology owes a lot to military research on transmissions initiated since the 1940s. Since 1998, several manufacturers have joined forces with Ericsson to work on their respective devices using this technology, forming the Bluetooth SIG (Special Interest Group), a group that ensures the development of technology. Several standards followed one after the other, bringing with them a lot of improvements, especially in terms of data throughput.

How does Bluetooth data transfer work?

Like many wireless technologies, Bluetooth technology uses radio waves. The big difference with other modes of radio transmission like FM or TNT is the range: where radio and TV broadcast for miles to reach thousands of people, Bluetooth is intended for personal use in a restricted field. By analogy with the acronym WLAN (Wireless Local Area Network), we are talking here about WPAN, for Wireless Personal Area Network, that is to say, Wireless Personal Network. The average field of action of a Bluetooth connection is thus about ten meters and cannot exceed fifty meters in the best case. The frequency band used is between 2.402 and 2.480 GHz, divided into 79 channels of 1 MHz, the transmission is done using a combination of channels that changes constantly to avoid interference with other radio signals. The Best Bluetooth Audio Transmitter helps you to connect you outdated TV wirelessly to your headphone or Bluetooth technology allows wireless streaming of music from a compatible phone to a Bluetooth speaker.

What is the Bluetooth pairing?

The Bluetooth standard is designed for a direct connection between two devices only, a “master” device and a “slave” device. To communicate with each other, a smartphone and a Bluetooth device must be linked, they are called “paired”, most often by means of a code provided by the device that must be entered on the phone (often 0000). The phone then keeps the code in memory so that subsequent pairings are faster and can be done simply by selecting the device from a list.

What is A2DP?

The Advanced Audio Distribution Profile (A2DP) is a high-quality audio transmission standard used with Bluetooth technology to broadcast, for example, the sound of a smartphone to a wireless headset. This standard is compatible with stereo sound and works one way, from the transmitter to the receiver. A2DP audio streaming typically uses the SBC codec with a bit rate of up to 128 Kb / s.

What is AVRCP?

The AVRCP (Audio Video Remote Control Profile) is a profile that allows the control of audio-video streaming directly from the receiver (headphones or speakers). In practice, this allows you to change the song directly on the headphones or speaker via a dedicated key, without having to intervene on the smartphone or tablet that emits the music.

What is apt-X?

Compatible with Bluetooth A2DP Stereo devices, the apt-X codec offers a quality relatively close to the CD-Audio. With a compression ratio of 4: 1 on average, the music listened to is of very good quality. FLAC, Apple Lossless or PCM files transmitted via this protocol are relatively un-degraded. MP3 or AAC files with a bit rate of fewer than 350 Kbps are transmitted without transcoding or deterioration. The dynamic range is 92 dB, the quantization is 16 bits and the frequency response is between 20 Hz and 22 kHz (like the CD-Audio). In addition, the apt-X codec is compatible with conventional SBC Bluetooth systems.

The Low Latency version of the apt-X codec lowers the latency between sending and receiving the audio signal from 150 ms (standard Bluetooth) to only 32 ms. This very low latency allows you to enjoy the sound of videos or games from a smartphone or tablet on a Bluetooth speaker, without having to support a gap between the image and sound.

The aptX HD is a codec version aptX optimized for transmission Bluetooth HD audio files up to 24 bit/ 48 kHz. This codec is backward compatible with previous aptX codecs.

What are the Bluetooth HSP and HFP profiles?

The Headset Profile (HSP) and the Hand-Free Profile (HFP) profile support hands-free telephony. This is the case for the vast majority of wireless Bluetooth headsets but also some Bluetooth speakers. The HSP or HFP compatible headphones or speakers include a microphone to transmit your voice to the caller, as well as a dedicated key for answering and hanging up. To optimize the quality of the conversation, it may be useful to opt for a device with a noise reduction microphone.

How to easily broadcast your music wirelessly
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2 thoughts on “How to easily broadcast your music wirelessly

  • September 26, 2018 at 10:20 am
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  • September 29, 2018 at 3:56 am
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    Cheers, here from bing, i enjoyng this, will come back again.

    Reply

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