A:Answer Hi Cami,
Thank you for your inquiry! The Sony WH-1000XM4 utilizes our improved Precise Voice Pickup Technology which reduces background noise during phone calls and delivers clearer voice quality to the other person on the phone. This controls five of the microphones in the headphones optimally and performs advanced audio signal processing to pick up voices clearly and precisely for hands-free calls and Speak-to-Chat.
That being said, the noise canceling function of the headphones works differently during a call than when playing music. If you hear ambient sound, headphone operation sound, or white noise (i.e., a small electrical noise with continuous static sound) during a call, that is an effect of Sidetone and not a malfunction.
Regards,
Jess
