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Hi everyone,
I’m looking for help identifying a Bluetooth module/chipset for an embedded hands-free voice project.
The requirement is specific:
I need a Bluetooth module/chipset that can operate as a Hands-Free device and transmit externally supplied digital audio as the HFP/SCO/eSCO microphone uplink to a phone.
Minimum voice quality target:
Acceptable digital input paths could be:
I'm not looking for analog microphone input into the Bluetooth module, nor am I looking for a generic Bluetooth audio/A2DP module. I specifically need proof that the external digital audio input can be used as the microphone source for HFP/SCO/eSCO uplink.
For example, a module saying “HFP supported” and “I2S supported” separately is not enough. I need the documentation, firmware, SDK, or known working example to explicitly show that digital audio can feed the HFP microphone/uplink path.
My previous candidate was Microchip BM83 / IS2083, but I could not find clear documentation proving that external I2S/DR1 audio can be routed into the HFP/SCO uplink encoder. The documented safe paths appeared to be analog mic or PDM mic, which does not solve my use case.
Ideal solution:
I’m especially interested in leads involving:
Does anyone know of a module, chipset, SDK, firmware stack, or reference design that actually supports this?
Thanks.
I’m looking for help identifying a Bluetooth module/chipset for an embedded hands-free voice project.
The requirement is specific:
I need a Bluetooth module/chipset that can operate as a Hands-Free device and transmit externally supplied digital audio as the HFP/SCO/eSCO microphone uplink to a phone.
Minimum voice quality target:
- HFP wideband speech / mSBC
- Better is welcome, but only if it applies to hands-free call uplink, not music streaming
Acceptable digital input paths could be:
- PCM
- I2S
- TDM
- SCO/eSCO PCM pins
- External codec interface
- HCI SCO audio, if practical
I'm not looking for analog microphone input into the Bluetooth module, nor am I looking for a generic Bluetooth audio/A2DP module. I specifically need proof that the external digital audio input can be used as the microphone source for HFP/SCO/eSCO uplink.
For example, a module saying “HFP supported” and “I2S supported” separately is not enough. I need the documentation, firmware, SDK, or known working example to explicitly show that digital audio can feed the HFP microphone/uplink path.
My previous candidate was Microchip BM83 / IS2083, but I could not find clear documentation proving that external I2S/DR1 audio can be routed into the HFP/SCO uplink encoder. The documented safe paths appeared to be analog mic or PDM mic, which does not solve my use case.
Ideal solution:
- Low-cost / practical module or chipset
- HFP Hands-Free role
- mSBC / WBS support minimum
- Digital voice input for HFP uplink
- MCU control via UART, USB, HCI, AT commands, SPI, I2C, or similar
- Call-state events available to MCU if possible
- Firmware/configuration tools realistically accessible to an individual developer
I’m especially interested in leads involving:
- Qualcomm / CSR / BlueCore / QCC modules
- Older HFP modules exposing SCO PCM pins
- Modules intended for external audio codecs
- Open-source or low-cost host-stack approaches
- Any known working module where PCM/I2S/SCO digital audio is confirmed to feed HFP uplink
Does anyone know of a module, chipset, SDK, firmware stack, or reference design that actually supports this?
Thanks.
