Dual-Amplifier Audio Output for Better Sound on 4.2 V Batteries
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Solution Overview
Problem
Terminal devices deliver relatively poor audio quality due to limitations in existing audio systems powered by 4.2 V batteries.
Innovation Solution
An audio system with a high-power audio power amplifier and a second loudspeaker, dynamically adjusting treble and bass audio streams based on battery status and volume level to improve audio quality and battery life, utilizing a boost module and switch switching module to optimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 4.2 V battery powers the audio system with a single audio power amplifier, then the device structure remains simple, but the audio quality is poor
Solution Approach 1:
The patent divides the audio system into two separate power amplifiers: a first audio power amplifier connected to a first loudspeaker and a second audio power amplifier connected to a second loudspeaker. This segmentation allows each amplifier to handle different audio frequency ranges (treble and bass respectively), thereby improving overall audio quality while maintaining manageable system complexity through modular architecture
Solution Approach 2:
The patent applies local quality by assigning different functions to different parts of the audio system. The first audio power amplifier is optimized for treble audio streams while the second audio power amplifier handles bass audio streams. This localized optimization allows each component to perform its specific function with high quality, resolving the contradiction between improved audio quality and system complexity
2Reliability
If the second audio power amplifier operates at high power consumption to improve audio quality, then the audio quality improves, but the battery life decreases
Solution Approach 1:
The patent implements dynamic adjustment of the second audio power amplifier's operating voltage based on battery status. When battery remaining level is high and temperature is within normal range, the amplifier operates at high voltage for optimal audio quality. When battery level drops or temperature increases, the system dynamically reduces voltage to conserve battery life. This dynamic adaptation resolves the contradiction between maintaining high audio quality and extending battery duration
Solution Approach 2:
The system changes the operating voltage parameter of the second audio power amplifier based on battery conditions. By adjusting the voltage parameter dynamically, the system can operate at high power consumption when battery allows (improving audio quality) and reduce power consumption when battery is low (extending battery life), thereby resolving the contradiction between audio quality and battery duration
3Power
If the audio system uses high power consumption to drive the second loudspeaker with greater output power, then the driving capability improves, but the energy consumption increases
Solution Approach 1:
The system employs periodic action by using PWM (pulse width modulation) to control the second audio power amplifier. The amplifier operates in periodic on/off cycles, adjusting the duty cycle based on audio requirements and battery status. This allows the system to achieve high output power when needed while reducing average power consumption, resolving the contradiction between output power and energy consumption
Solution Approach 2:
The system dynamically changes the voltage parameter supplied to the second audio power amplifier based on battery remaining level and temperature. When battery level is high and temperature is normal, higher voltage provides greater output power. When battery is low or temperature is high, voltage is reduced to lower power consumption. This parameter adaptation resolves the contradiction between maintaining high output power and reducing energy consumption
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
Enhances audio quality while extending battery life by dynamically adjusting audio streams and power consumption based on battery status and volume level.
Implementation Method 1
an output end of the buck module is connected to a second input end of the first audio power amplifier
Data Source
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AI summary
This application provides an audio system and a terminal device, and may be applied to the field of audio technologies. In the audio system of this application, a second audio power amplifier is added on the basis of a first audio power amplifier. The first audio power amplifier is a common audio power amplifier, and the second audio power amplifier is a high-power audio power amplifier, so that audio quality of the terminal device can be improved through the second audio power amplifier. In addition, an audio processor in the audio system may dynamically adjust, based on a volume level, a battery level, or a battery temperature, audio streams input to the first audio power amplifier and the second audio power amplifier, and dynamically adjust an input voltage of the second audio power amplifier based on the volume level, the battery level, or the battery temperature, so that power consumption of the terminal device can be reduced while improving the audio quality of the terminal device.