Audio Signal Processing Circuit for High-Frequency Power Management
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Solution Overview
Problem
Existing audio signal processing technologies face challenges in amplifying high-frequency signals beyond the rated power of speaker drivers without exceeding safe limits, as high-frequency signals attenuate rapidly and increasing output power can lead to driver burnout.
Innovation Solution
An audio signal processing circuit and method that selectively amplifies high-frequency signals beyond the rated power while keeping middle and low-frequency signals within safe limits, using a power adjuster to enhance high-frequency power without adjusting the power of middle and low-frequency signals, thereby preventing driver burnout and improving transmission distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the output power of the power amplifier is increased to exceed the rated power limit of the speaker driver, then the transmission distance of high-frequency signals is improved, but the speaker driver will be burned
Solution Approach 1:
The patent segments the audio signal into high-frequency components (above 18 kHz) and middle/low-frequency components (below 18 kHz). The power amplifier's output is separately controlled for each frequency band, allowing high-frequency signals to exceed the rated power limit while keeping middle/low-frequency signals within safe limits. This segmentation enables selective power management that prevents driver burnout while achieving extended transmission distance for ultrasonic communication.
Solution Approach 2:
The patent applies different power levels to different frequency regions. Specifically, the high-frequency band (18-24 kHz) is allowed to operate at enhanced power levels (e.g., 3-6 times the rated power) for improved transmission distance, while the middle and low-frequency bands are restricted to the rated power limit. This local quality approach optimizes each frequency band's power consumption and safety characteristics independently.
2Reliability
If the gain of the power amplifier is adjusted to ensure output signal meets the rated power limit, then the speaker driver is protected from burning, but the transmission distance of high-frequency signals is limited
Solution Approach 1:
The patent implements dynamic gain control where the power amplifier's gain is adjusted based on the frequency content of the input signal. When high-frequency components are present, the system dynamically increases the gain for those frequencies beyond the static rated power limit, while maintaining safe gain levels for middle and low frequencies. This dynamic adjustment allows the system to adaptively extend transmission distance when needed while preserving driver protection.
Solution Approach 2:
The patent changes the power parameter selectively based on frequency. The system monitors the audio signal spectrum and adjusts the output power parameter differently for high-frequency bands versus middle/low-frequency bands. By changing the power parameter dynamically according to frequency content, the system achieves extended transmission distance for ultrasonic signals while maintaining reliability through restricted power levels for frequencies that could cause driver damage.
3Loss of information
If the power of high-frequency signal is increased to improve transmission distance, then the data error rate is reduced, but the risk of driver burnout increases
Solution Approach 1:
The patent segments the power control mechanism by frequency band, allowing independent power management for high-frequency signals carrying data versus middle/low-frequency signals. By segmenting the power control, the system can increase power specifically for the high-frequency data-carrying components to reduce data error rates, while simultaneously restricting power for middle/low-frequency components to prevent driver burnout. This selective power segmentation resolves the contradiction between data reliability and driver protection.
Data Source
AI summary
The disclosure provides an audio signal processing circuit and an audio signal processing method, adapted for processing the input signal of a speaker configured with a rated power. The audio signal processing circuit includes, but not limited to, an audio signal generator and a power adjuster. The audio signal generator provides an audio signal including a high-frequency signal and a middle and low-frequency signal. The power adjuster is electronically coupled to the audio signal generator, and adjusts the power of the high-frequency signal according to an enhanced power larger than the rated power without adjusting the power of the middle and low-frequency signal. The output signal of the power adjuster can be inputted into the speaker. Accordingly, the transmission range for the high-frequency signal can be improved.