Supported profile roles are “controller” and “target. We recommend maintaining test levels above –54 dBFS for meaningful results.ĪVRCP is the “Audio/Video Remote Control Profile.” This profile is used in conjunction with A2DP, and provides “transport” controls such as Play, Pause, Reverse, Forward, etc. In A2DP Source, the APx Bluetooth transmitter mutes the audio when the average signal level falls below –54 dBFS for more than 1 second. Audio is distributed in one direction only, from the source device to the sink device.ĪPx supports the mandatory SBC and the optional apt-X codecs. The SBC codec is mandatory codecs such as mp3, AAC, apt-X and others are optionally supported.ĪPx supported profile roles are “source” (transmitting audio) and “sink” (receiving audio). Compared to HSP, HFP provides a few more AT commands for hands-free convenience, such as last number redial.Ī2DP is the “Advanced Audio Distribution Profile.” This profile supports higher bit rate, higher performance stereo audio. Supported roles are AG “Audio Gateway” (the phone) and HF “Hands Free” (the headset or car kit mic/speaker).Īudio flows in a duplex (bi-directional) mode, connecting the Audio Gateway device to the Hands Free device.Ī subset of AT commands are also supported for phone operations. This profile is used for phone-to-headset communication and for phone-to-car kit hands free communication. The new TLSR9 chip series from Telink supports the latest Bluetooth standards version 5. Understanding Bluetooth Versions 4.0, 4.1, 4.2, 5.0. Bluetooth version 5.2’s new features open up many new opportunities for audio device manufacturers, but they’ll need the right SoC solution to unlock what this technology has to offer. Letâs explore them to understand the features they each support. HFP is the “Hands Free Profile.” This profile supports only low bit rate, “voice-quality” audio, using the CVSD codec at 8 kHz sample rate or the HSP 1.6 "wideband speech" mSBC codec at 16 kHz*. There are four main Bluetooth profiles, as follows: HSP (Handset Profile), HFP (Hands Free Profile), A2DP (Advanced Audio Distribution Profile), and AVRCP (Audio/Video Remote Control Profile). Supported roles are AG “Audio Gateway” (the phone) and HS “Headset”.Īudio flows in a duplex (bi-directional) mode, connecting the Audio Gateway device to the Headset device.Ī subset of AT commands are also supported for phone operations. This profile is used for phone-to-headset communication. HSP is the “Head Set Profile.” This profile supports only low bit rate, “voice-quality” audio, using the CVSD codec at 8 kHz sample rate or the HSP 1.6 "wideband speech" mSBC codec at 16 kHz.
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