Apple Inc.

Raymond B Montagne

Matthew Xavier Mora

Anthony Joseph Guetta

William P Cornelius

Niel David Warren

Michael W Murphy

Brett D George

Girault W Jones, Jr

Matthew X Mora

Methods and apparatus for efficiently transporting data through network tunnels. In one embodiment, a tunneled device advertises certain capabilities to peer devices of a network, and discovers capabilities of peer devices of the network. In a second embodiment, each device of a tunneled network derives a network parameter from a transit protocol parameter for use in data networking.

Methods and apparatus for transporting data through network tunnels

Methods and apparatus for determining the existence of an external clock over a digital input port on a computer. In one embodiment, the external clock is validated, and a lock is performed when the clock is valid. Whenever a loss of the lock is detected, and, if a re-lock is likely, the apparatus is muted so that audio artifacts that would otherwise be heard are minimized. The methods and apparatus also provide automatic re-locking to the external clock when a sampling rate change is detected.

For externally clocked digital audio input, determining a valid clock and muting audio during synchronization

A method and apparatus for demodulating a pulse width modulated (PWM) signal previously modulated with either a first or second data value comprises sensing an actual duration of the first period of the bit cell, and generating an actual first signal value that is proportional to the actual duration of the first period of the bit cell. Using the actual first signal value and an expected first signal value, a first adjustment amount is determined and used for adjusting the actual first signal value. Then, an actual duration of the second period of the bit cell is sensed. The adjusted actual first signal value is further adjusted by a second adjustment amount to produce a final adjusted signal value, the second adjustment amount being proportional to the actual duration of the second period of the bit cell. Finally, a signal is generated which alternatively has a first value or a second value in correspondence with the final adjusted signal alternatively being greater than or not greater than a reference value. Alternative embodiments of the method and apparatus include an accurate as well as an approximate determination of the first adjustment amount.

Pulse code bit cell demodulation

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Cascade, ID, United States of America

Raymond B Montagne