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2. AirPods Pro - Wikipedia

   en.wikipedia.org/wiki/AirPods_Pro

   Apple announced AirPods Pro on October 28, 2019, and released them two days later on October 30, 2019. [7] They include features of standard AirPods, such as a microphone.. They also have noise cancellation to reduce exterior sounds background noise, accelerometers and optical sensors that can detect presses on the stem and in-ear placement, and automatic pausing when they are taken out of the ea

3. Apple headphones - Wikipedia

   en.wikipedia.org/wiki/Apple_headphones

   AirPods Pro were released on October 30, 2019 as a premium option compared to AirPods. They feature the same H1 chip found on the second-generation AirPods, and boast a slimmer design, control by pressing the force sensor on the stems instead of double tapping on the ear pieces, active noise cancellation , adaptive EQ , IPX4 water resistance, a ...

4. AirPods Max - Wikipedia

   en.wikipedia.org/wiki/AirPods_Max

   AirPods Max are wireless Bluetooth over-ear headphones designed by Apple, and released on December 15, 2020. They are Apple's highest-end option in the AirPods lineup, sold alongside the base model AirPods and mid-range AirPods Pro .

5. AirPods - Wikipedia

   en.wikipedia.org/wiki/AirPods

   AirPods (2nd gen) AirPods Pro (1st gen) AirPods Max AirPods (3rd gen) AirPods Pro 2 (previously 2nd gen) AirPods 4 AirPods 4 with ANC; Timeline Announced January 9, 2007 [47] September 7, 2016 March 20, 2019 October 28, 2019 December 8, 2020 October 18, 2021 September 7, 2022 September 9, 2024 Released June 29, 2007 [47] December 13, 2016 ...

6. Head-related transfer function - Wikipedia

   en.wikipedia.org/wiki/Head-related_transfer_function

   HRTF filtering effect. A head-related transfer function (HRTF) is a response that characterizes how an ear receives a sound from a point in space. As sound strikes the listener, the size and shape of the head, ears, ear canal, density of the head, size and shape of nasal and oral cavities, all transform the sound and affect how it is perceived, boosting some frequencies and attenuating others.

7. Equal-loudness contour - Wikipedia

   en.wikipedia.org/wiki/Equal-loudness_contour

   The human auditory system is sensitive to frequencies from about 20 Hz to a maximum of around 20,000 Hz, although the upper hearing limit decreases with age. Within this range, the human ear is most sensitive between 2 and 5 kHz, largely due to the resonance of the ear canal and the transfer function of the ossicles of the middle ear.