How Do Bluetooth Headphones Work?

How Do Bluetooth Headphones Work?

When wireless headphones hit the market they took the world by storm as personal audio has been revolutionized in providing a new listening experience. There is no longer the need for messy wires that get in the way of your movement, but rather a switch to hassle-free listening. Since their introduction in 2004, the technology has only been advancing and surging towards a better audio experience. Let’s now dive into How Do Bluetooth Headphones Work to get a better understanding of this revolutionary audio source. 

How Do Bluetooth Headphones Work?

How Do Bluetooth Headphones Work?
Source: Pixabay

Wireless headphones as the name implies, receive audio signals wirelessly rather than via headphone cords (also known as “hardwired” headphones). Wireless headphones include built-in receivers that accept wireless waves carrying the audio signal that drives the headphone drivers. The carrier wave is the proper name for this “wireless communication”. The transmitters of the device will encode the audio signal to a wireless format (the carrier wave) and transmit it over the air.

The modulating signal refers to the desired audio signal. This signal is then encoded into a carrier wave, which is then wirelessly sent to the receiver. Wireless headphone signals are transmitted via carrier waves in the radio frequency or infrared frequency ranges. Frequencies in the audible range of 20Hz to 20,000 Hz make up the majority of audio transmissions. The carrier wave is read by the wireless receiver and the modulating signal (audio signal) is decoded from it. Wireless receivers need to be tuned in order to accept the carrier wave frequency that has been provided. 

If the audio signal that is received is digital it will then be transformed into an analog audio signal. After that, the analog audio stream is amplified to properly drive the headphone drivers. It’s worth noting that, regardless of the sort of wireless headphones, the fact that they are wireless indicates they are active. The headphones must be powered by internal batteries to preserve their “wirelessness”. These batteries can range from AA, AAA, or batteries that are inserted into the headphones. In today’s era of wireless headphones, they are commonly seen to have built-in rechargeable batteries.

The latest technology of Bluetooth 4.0, allows for the pairing of other Bluetooth-enabled devices to be quick and flawless. Bluetooth pairing is largely dependent on the devices to be associated. Knowing what materials Bluetooth headphones are constructed of will help you better understand how they work. Bluetooth headphones use the same fundamental components as wired headphones to produce sound. Magnets, voice coils, and diaphragms are among them. The driver unit is made up of these components when they are all put together.

What is a Carrier Wave

Carrier waves transfer the audio signal from the transmitter to the receiver as the name implies. For wireless transmission, carrier waves are electromagnetic waves that have been modulated with an information-carrying signal. These electromagnetic waves are created when an electric charge vibrates. Electric and magnetic components are present in these electric charge vibrations.

These waves are responsible for transporting energy from one location to another. This might be the Sun’s heat and light reaching Earth, or wireless audio from a transmitter to a headphone receiver. Electromagnetic waves, unlike sound waves, which are mechanical waves, may pass into a vacuum and do not interact directly with the molecules of a medium (the atoms inside the medium will absorb some of the energy).

What is a Modulating Signal

The modulating signal is used to module the carrier signal, as its name implies. The carrier wave then effectively transports this modulating signal from the wireless transmitter to the receiver. The audio signal meant for the headphone drivers is the modulating signal in the case of wireless headphones. The modulating signal can modify the carrier wave in a variety of ways.

Main Components of a Bluetooth Headphone

Main Components of a Bluetooth Headphone
Source: Tomasz Gawlowski

Driver Unit

The part of a headphone that creates sound is the driver unit. As a result, the transducer is in charge of transforming electrical signals into sound. Depending on the transducer technology used, the driver unit might be of many forms. A “ dynamic” driver, often known as a moving coil driver, is the most often used driver unit. It has a ferrite or neodymium magnet, as well as a voice coil and a cone (diaphragm). 

System On Chip

The System on a chip (SOC) is what Bluetooth headphones have to function. They consist of an integrated which includes the Bluetooth hardware module as well as a digital signal processor (DSP), digital to analog converter (DAC), connections ports, memory, microprocessors, microcontrollers among many other technologies.  

Rechargeable Battery

Unlike wired headphones, Bluetooth headphones require batteries to operate. The battery powers the SoC inside the gadget, allowing it to connect to other Bluetooth-enabled devices, process and convert digital signals into analog signals, and use noise-canceling functions, among other things. The headphone will also contain a charging port to recharge the device when needed. 

As the world continues to shift towards wireless capabilities it is important to understand the technology of this revolution. No headphone is made the same, as each offers a multitude of features catered towards the consumer. If you are in the market for a pair of Bluetooth headphones, it is great to check out the Best Bluetooth Headphones. Wireless headphones offer convenience for the listener and provide an ease of audio transmission. We now have a better understanding of what goes into our pair of wireless headphones and How Bluetooth Headphones Work to offer the world a new personal audio experience.  

Written by Justin Ornelas

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