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The Bluetooth protocol stack is split in two parts: a "controller stack" containing the timing critical radio interface, and a "host stack" dealing with high level data. The controller stack is generally implemented in a low cost silicon device containing the Bluetooth radio and a microprocessor.
A device that wants to communicate only with a bonded device can cryptographically authenticate the identity of the other device, ensuring it is the same device it previously paired with. Once a link key is generated, an authenticated ACL link between the devices may be encrypted to protect exchanged data against eavesdropping .
Often these receivers are built to only support the audio component of AirPlay, much like AirTunes. Bluetooth devices (headsets, speakers) that support the A2DP profile also appear as AirPlay receivers when paired with an iOS device, although Bluetooth is a device-to-device protocol that does not rely on a wireless network access point.
The devices film with stereo audio instead of mono audio for the first time on iPhone, even though two opposite-sided microphones had been built in since iPhone 4. [69] [70] [71] The iPhone 11 and 11 Pro series introduced an ultrawide lens; the latter two became the first triple-camera iPhones. The 11 has a dual-lens setup, lacking the ...
iOS 8 introduced Continuity, a cross-platform (Mac, iPhone, and iPad) system that enables communication between devices in different product categories. Continuity enables phone call functionality for the iPad and Mac, in which calls are routed through the iPhone over to a secondary device. The secondary device then serves as a speaker phone.
The iPhone 8 and iPhone 8 Plus are smartphones developed and marketed by Apple Inc. They are the eleventh generation of the iPhone . The iPhone 8 was released on September 22, 2017, succeeding the iPhone 7 and iPhone 7 Plus , respectively.
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If the two output buses are to remain stereo then a law of −3 dB is desirable. A law of −4.5 dB at center is a compromise between the two. A pan control fully rotated to one side results in the source being sent at full strength (0 dB) to one bus (either the left or right channel) and zero strength (− ∞ dB) to the other.