Bluetooth-HFP
Bluetooth-HFP, or Hands-Free Profile, is a Bluetooth protocol designed to allow devices to communicate with hands-free audio devices like wireless headsets and car audio systems. Here are key aspects of Bluetooth-HFP:
History and Development
- Bluetooth-HFP was introduced with the release of Bluetooth version 1.5, which was part of the Bluetooth specification in 2005.
- The profile was developed by the Bluetooth Special Interest Group (Bluetooth SIG), which is responsible for overseeing the development of Bluetooth standards.
- It evolved from earlier profiles like the Headset Profile (HSP), which provided basic audio transfer capabilities for voice calls.
Functionality
- Bluetooth-HFP enables the following functionalities:
- Voice dialing.
- Last number redial.
- Call answer, reject, and terminate.
- Voice recognition.
- Microphone mute.
- Call transfer between the headset and phone.
- Three-way calling (multiparty calls).
- Call waiting notifications.
- It supports better audio quality than HSP, including Wideband Speech which enhances the audio frequency range for clearer calls.
- Bluetooth-HFP can also provide status information about the connection and the audio device to the user's phone or other compatible devices.
Versions and Enhancements
- Over time, Bluetooth-HFP has seen several updates:
- HFP 1.5 introduced Echo Cancellation and Noise Reduction (ECNR).
- HFP 1.6 added support for Wideband Speech, enhancing call clarity.
- HFP 1.7 further refined the audio quality and added features like in-band ringtone, where the ringtone is played through the headset rather than the phone.
Usage
- Bluetooth-HFP is widely used in automotive systems for hands-free calling, reducing the need for drivers to handle their phones physically.
- It's also prevalent in wireless headsets and speakerphones, providing users with the convenience of managing calls without touching their mobile devices.
Limitations
- While Bluetooth-HFP is excellent for voice calls, it does not support high-quality music streaming like A2DP (Advanced Audio Distribution Profile). However, many devices support both profiles for comprehensive audio functionality.
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