Measurement of insertion loss and gain in variable hear-through and noise cancellation modes of true wireless earbuds

Open Access

Table 1

The modes tested in each device and study nomenclature used to describe equivalent modes.

Study nomenclature used to	Apple Airpods Pro 2	Bose QuietComfort	Sony LinkBuds S
describe equivalent modes	(2nd gen.) modes	Earbuds II modes	modes
Hear-through mode (HTM)	Ambient noise reduction (ANR)	Noise cancellation (NC)	Ambient sound (AS)
– HTM 1 (Greater awareness)	– ANR 0	– NC 1 (Aware mode)	– AS 20
– HTM 2	– ANR 20	– NC 2	– AS 16
– HTM 3	– ANR 40	– NC 4	– AS 12
– HTM 4	– ANR 60	– NC 6	– AS 9
– HTM 5	– ANR 80	– NC 8	– AS 5
– HTM 6 (Lesser awareness)	– ANR 100	– NC 10 (Quiet mode)^*	– AS 1
Noise cancellation mode (NCM)	Noise cancellation (NC)	Noise cancellation (NC)^*	Noise cancelling (NC)
– NCM (Least awareness)	– NC	– NC 10 (Quiet mode) ^*	– NC
Off Mode	Off	Battery depleted (Off)^**	Off
– Off	– Off	– Battery depleted (Off)^**	– Off

The results for Bose NC 10 mode were used to represent both the Noise Cancellation Mode (NCM) and Hear-Through Mode 6 (HTM 6) for comparative analysis with the other devices.

^**

As the Bose earbuds did not feature a selectable Off mode, the passive Off Mode measurements were recorded after the battery had depleted.

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