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Bluetooth hands-free telephony allows wireless, microphone-enabled calling via headsets, car kits, or computer audio systems using Bluetooth short-range radio technology.
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Bluetooth Audio
What is Bluetooth?
Bluetooth is a standard for short distance (approx. 30 feet or less) radio signals (2.4GHz) between devices in order to exchange information. Bluetooth technology is used on mobile phones (iPhone, iPad, iPod) wireless keyboards, wireless headphones, car stereos, audio/video receivers, camcorders, digital cameras, speakers and more. For example, if you have an iPhone 4S with music you want to listen to on your Bluetooth capable car stereo, just pair the phone with the car stereo and you have a powerful stereo system on the go.
What is Bluetooth pairing?
Bluetooth pairing is the discovery and establishment of communication between two Bluetooth devices. Usually a passkey has to be agreed upon before data can be received. Sometimes this is just 0000 but check the user manual for your device.
When a device "has Bluetooth", that means it has a piece of hardware, a small computer chip, that contains the Bluetooth radio, and some software that lets you, the user, connect that device to other products wirelessly using Bluetooth technology.
Bluetooth History:
Bluetooth has been around since 1994 and has undergone many improvements and revisions (1.0 in 1999, 1.2 in 2003, 2.0 in 2004, 3.0 in 2009, 4.0 in 2010).
In 2000 - First chip to integrate radio frequency, baseband, microprocessor functions and Bluetooth wireless software.
In 2004 - First stereo headphones.
In 2007 - First TV with Bluetooth.
In 2011 - Microsoft announces that Windows 8 will support Bluetooth v4.0
Apple announces that the iPhone 4S will support Bluetooth v4.0 and become the first Bluetooth Smart Ready phone.
What is a Bluetooth profile?
A Bluetooth profile is a further refinement of the core standard for specific services between devices. In order for Bluetooth devices to communicate, they must have compatible profiles. For example, a computer and its wireless keyboard need to have compatible profiles. A stereo and a wireless headphone need compatible profiles. But a keyboard and a headphone do not work together so they do not have the same profiles. When two Bluetooth devices establish a connection, they learn about the protocols the partner device offers. Only devices that share the same protocols can exchange data, just like two humans have to agree on a common language to have a meaningful conversation.
While Bluetooth defines the physical wireless connection between devices, a Bluetooth profile establishes the commands and functionality these devices can exchange using the Bluetooth technology.
HSP (Handset Profile) – provides the basic functionalities needed for communication between a handset (mobile phone) and headset.
HFP (Hands free Profile) – with somewhat extended functionality to HSP, original use was intended to control a mobile phone from a stationary in car hands free unit.
Bluetooth logo - look for the symbol with a pointed B and a reverse K merged together
Hands-free calling and music control
Use your Bluetooth cell phone with your car stereo or just use a Bluetooth headset with your phone for hands free operation.Since 2009 many cars have the capability for wireless Bluetooth connectivity with your iPhone or other smart phone. You can make calls or play music. An incoming call will mute the music. Bluetooth lets you talk hands-free in the car, but it can do a whole lot more. Many in-dash stereos let you stream audio from your phone over your vehicle's speakers. Depending on your phone's features, you may be able to listen to driving directions, Internet radio, stored music, and more. There are many different systems but most will require you to setup your phone to talk to your car's Bluetooth kit. This is called pairing.
How to pair iPhone with your car's Bluetooth kit.
On your iPhone, select SETTINGS, GENERAL, BLUETOOTH and turn Bluetooth ON if set to OFF.
With Bluetooth turned ON the phone and the car's bluetooth kit will try to discover each other. You will need to operate the car's kit so that it also is trying to pair up with the phone. Read user manual to find out exact instructions for pairing as each device is different. The two devices need to be in DISCOVERY mode for pairing.
Enter the PIN or passkey to establish communication.
Successful pairing will show CONNECTED and the devices are ready to exchange information wirelessly.
• Nulaxy KM18 Bluetooth 5.4 Car Adapter with 1.44" Clear Display & Flexible Gooseneck - FM Radio Transmitter & Bluetooth Receiver for Hands-Free Calls, Wireless Music via BT/FM/AUX/TF, USB Car Charger
• Bluetooth 6.0 Car Speaker, Handsfree Wireless Bluetooth Speaker Kit for Cell Phone, Support Siri & Google Voice Assistant, Motion Auto On, Wireless Audio Car Kit Speakerphone with Visor Clip
• BEST Bluetooth FM Transmitters for Car
Connects to your aftermarket or factory stereo system so you can take calls from your Bluetooth phone through your car's speakers. Hands Free calling through your car's speakers
Listen to your digital music in the car
- Bluetooth car kit includes 2.4" color display panel, two microphones, remote-control keypad, and mute box
- hardware for mounting the keypad and display on your dash or steering wheel
- works with all Bluetooth phones and A2DP stereo devices, including many iPod and iPhone models
- removable, dash-mounted display panel lists caller, number and music information when available
- 6-button, remote-control keypad controls all phone menu and music functions
- USB input and auxiliary input for connecting music sources
- SD card slot built into the display panel
- built-in digital amplifier (20 watts RMS x 4)
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Features:
- hands-free phone calls and streaming MP3 music with most factory or aftermarket car stereo systems (may require vehicle-specific adapters for plug-in connection)
- automatically mutes your car stereo for phone calls
- works with up to 5 Bluetooth phones
- voice-recognition software stores up to 150 names for hands-free dialing (only works with certain phones)
- voice-synthesis (text-to-speech) technology announces contact names
- noise reduction and echo cancellation technology for clear voice transmission
- works with TextFriendly service for hands-free access to SMS text messages and email
- HFP (Hands-Free Profile)
- HSP Headset Profile)
- A2DP (Advanced Audio Distribution Profile) Stereo Audio
- AVRCP (Advanced Video Remote Control Profile)
- OPP (Object Push Profile)
- PBAP (Phone Book Access Profile)
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