Methods of calibrating tone-based communications systems
First Claim
1. A calibration method for calibrating tones transmitted from a transmitter circuit to a receiver circuit during tone-based communications of data from the transmitter circuit to the receiver circuit, comprising:
- at the receiver circuit, receiving a calibration tone that has a calibration tone frequency;
at the receiver circuit, receiving a given tone other than the calibration tone that has a given tone frequency; and
at the receiver circuit, calibrating the given tone using the received calibration tone, wherein the calibration tone and the given tone are received at different times, wherein when the given tone is being received, the calibration tone is not being received, and wherein calibrating the given tone using the received calibration tone comprises calculating a ratio of the given tone frequency to the calibration tone frequency to identify the data.
1 Assignment
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Accused Products
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.
127 Citations
11 Claims
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1. A calibration method for calibrating tones transmitted from a transmitter circuit to a receiver circuit during tone-based communications of data from the transmitter circuit to the receiver circuit, comprising:
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at the receiver circuit, receiving a calibration tone that has a calibration tone frequency; at the receiver circuit, receiving a given tone other than the calibration tone that has a given tone frequency; and at the receiver circuit, calibrating the given tone using the received calibration tone, wherein the calibration tone and the given tone are received at different times, wherein when the given tone is being received, the calibration tone is not being received, and wherein calibrating the given tone using the received calibration tone comprises calculating a ratio of the given tone frequency to the calibration tone frequency to identify the data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification