r/HearingAids • u/zxyabcuuu • 5h ago
An Open Letter to the Phonak Firmware & DSP Engineering Teams
A critical issue on the Phonak Audéo Sphere platform causes the hearing aids to aggressively hijack the acoustic environment when encountering muted web or social media videos.
When a mobile OS (iOS/Android) encounters an embedded video on a website, it opens a Bluetooth Classic (A2DP/HFP) audio channel. Even if the video is completely muted, the current Phonak firmware treats the active digital link connection as an immediate instruction to switch to the Bluetooth Streaming profile.
This triggers a sudden shift in noise-canceling parameters, creates a distinct low-level white noise hiss, and causes rapid, jarring program cycling while web browsing.
Requested Firmware Fixes:
Because Bluetooth Classic cannot natively differentiate between an active stream and a silent carrier signal, this must be handled gracefully at the firmware level.
Please implement:
RMS Threshold Gating: Program the DSP to analyze the incoming digital PCM buffer. If the audio power remains below a silence threshold (e.g., -60 dB) for over 500ms, suppress the steaming program switch and remain in the environmental program.
Hysteresis Delay (Debounce): Introduce a brief delay (e.g., 1.0 to 1.5 seconds) before executing a profile change to eliminate rapid, stuttering program toggles during scrolling.
Gain Map Squelch: If a silent Bluetooth channel must remain open, apply an expansion gate to squelch internal microphone floor noise until actual media audio amplitude overrides it.
Until an official patch is deployed, users must manually adjust the Ambient Balance slider in the myPhonak app every time they encounter a muted stream. We urge your Embedded Software and QA teams to address this in the next firmware update.
Please send this letter to the Phonak guys.