Electronic device accessory with ultrasonic tone generator

Details Electronic device accessory with ultrasonic tone generator Electronic device accessory with ultrasonic tone generator

2008-09-03

2009-11-24

Kuntz, Curtis (Department: 2614)

Electrical audio signal processing systems and devices

Headphone circuits

C084S454000, C381S384000, C455S569100

Reexamination Certificate

active

07623667

ABSTRACT:
Electronic devices and accessories such as headsets for electronic devices are provided. A microphone may be included in an accessory to capture sound for an associated electronic device. Buttons and other user interfaces may be included in the accessories. An accessory may have an audio plug that connects to a mating audio jack in an electronic device, thereby establishing a wired communications link between the accessory and the electronic device. The electronic device may include power supply circuitry for applying bias voltages to the accessory. The bias voltages may bias a microphone and may adjust settings in the accessory such as settings related to operating modes. User input information may be conveyed between the accessory and the electronic device using ultrasonic tone transmission. The electronic device may also gather input from the accessory using a voltage detector coupled to lines in the communications path.

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