Spectrally Shaped Detection Pulses for Inaudible Audio Accessory Identification
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Solution Overview
Problem
Existing methods for detecting audio accessories connected to electronic devices often introduce audible artifacts, such as clicks or noises, due to the varying sensitivity and impedance of different accessories, making it difficult to accurately identify the accessory without compromising user experience.
Innovation Solution
The use of spectrally shaped detection pulses, either at low frequencies, below the human audible threshold, or above 20 kHz, to minimize audible artifacts while ensuring accurate impedance measurement, including techniques like pseudorandom modulation and high-pass filtering to suppress energy within the human audible frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional detection pulses are used to identify audio accessories, then detection speed is improved, but audible artifacts (clicks or noises) are generated due to varying sensitivity and impedance
Solution Approach 1:
The patent changes the frequency parameter of the detection pulse from conventional audible frequencies to ultrasonic frequencies above 20 kHz. This parameter change allows the detection pulse to remain inaudible to human ears while maintaining sufficient energy for accurate impedance measurement, thereby eliminating audible artifacts while preserving fast detection capability
Solution Approach 2:
The patent introduces an ultrasonic frequency band as an intermediary carrier for the detection pulse. This intermediary frequency range (above 20 kHz) serves as a medium that can transmit detection signals effectively without being perceived by humans, thus mediating between the need for fast detection and the requirement to avoid audible artifacts
2Measurement precision
If detection pulses with high energy are used to ensure accurate impedance measurement, then measurement precision is improved, but audible artifacts are generated
Solution Approach 1:
The patent changes the frequency parameter of the detection pulse to ultrasonic frequencies above 20 kHz. This parameter change enables the use of higher energy pulses that provide accurate impedance measurements while remaining inaudible to human ears, thus resolving the contradiction between measurement precision and audible artifact generation
Solution Approach 2:
The patent moves the detection pulse from the audible frequency dimension to the ultrasonic frequency dimension (above 20 kHz). This dimensional shift in frequency space allows the system to operate with higher energy levels for accurate measurement without impacting the audible range, effectively separating measurement requirements from human perception constraints
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for reliable and fast identification of audio accessories with minimal audible disturbance, improving user experience by reducing detection time and accuracy of impedance measurement, even with AC-coupled loads.
Implementation Method 1
shaped detection pulses, either at low frequencies, below the human audible threshold, or above 20 kHz, to minimize audible artifacts
Implementation Method 2
including techniques like pseudorandom modulation and high-pass filtering to suppress energy within the human audible frequency range
Implementation Method 3
including techniques like pseudorandom modulation and high-pass filtering to suppress energy within the human audible frequency range
Implementation Method 4
ensuring accurate impedance measurement
Data Source
AI summary
A method for identifying an accessory coupled to an electronic device. The method includes applying at least one detection pulse to the audio accessory, each detection pulse being spectrally shaped to be generally inaudible to a human user, receiving at least one response signal corresponding to each detection pulse that is indicative of the impedance of the accessory, and based on the impedance, identifying the accessory.