Speaker Signal Level Control Using Charge Estimation
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Solution Overview
Problem
Conventional signal processing devices require new hardware to detect output current and power supply voltage to adjust signal levels, which is not feasible in USB-powered devices that need to supply large currents, such as power amplifiers.
Innovation Solution
A signal processing apparatus that calculates an electric charge estimate value based on the input signal level and consumption charge, allowing for level adjustment without detecting capacitor voltage or output current, thus eliminating the need for new hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional hardware detection methods are used to detect output current and power supply voltage, then level adjustment can be performed, but additional hardware is required which increases device complexity
Solution Approach 1:
The patent replaces physical hardware detection systems (current detectors and voltage detectors) with a computational model that calculates electric charge estimate values using software algorithms. The processor computes the electric charge estimate value based on input signal levels and consumption charge without requiring physical sensors, thereby substituting mechanical/electrical detection hardware with computational software.
Solution Approach 2:
The patent introduces an electric charge estimate value as an intermediary parameter that mediates between the input signal level and the level adjustment control. Instead of directly detecting current and voltage, the system uses this calculated intermediary value to determine appropriate attenuation rates, simplifying the hardware requirements while maintaining control accuracy.
2Adaptability or versatility
If USB standard is used for power supply, then device portability is improved, but current supply capacity is limited to about 500 mA which is insufficient for power amplifiers
Solution Approach 1:
The patent performs preliminary calculation of the electric charge estimate value before actual power amplification occurs. By pre-calculating the required charge based on input signal levels and consumption charge, the system can proactively adjust attenuation rates to ensure stable operation within USB power limits, preventing power shortage issues before they arise.
Solution Approach 2:
The patent dynamically adjusts the attenuation rate based on the calculated electric charge estimate value. The system continuously monitors input signal levels and modifies the attenuation rate in real-time to match available USB power capacity, enabling adaptive operation that maximizes performance within power constraints rather than using fixed attenuation settings.
3Reliability
If level limit is performed based on detected voltage and current, then power amplifier stability is improved, but new detection hardware is required
Solution Approach 1:
The patent replaces physical detection hardware (voltage detectors and current detectors) with computational calculation methods. The processor calculates the electric charge estimate value using software algorithms based on input signal levels and consumption charge parameters, eliminating the need for additional detection circuits while maintaining the ability to stabilize power amplifier operation.
Data Source
AI summary
A signal processing apparatus includes a level adjuster adjusting a level of an input signal, and a setter calculating an electric charge estimate value being a value obtained by estimating an electric charge amount of a charging and discharging element based on the charging and discharging element to which a predetermined electric charge is supplied and in which the electric charge is held and the electric charge supplied to the charging and discharging element and setting an adjustment coefficient of the level adjuster based on the electric charge estimate value.