Audio Control Circuit With Temperature-Based Gain Balancing
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Solution Overview
Problem
Handheld electronic devices face challenges in achieving sufficient audio volume and stereo sound due to shrinking size and reduced power in loudspeaker modules, making it difficult to produce a better playback effect with a single loudspeaker.
Innovation Solution
An audio control circuit with a first gain adjusting module that includes a temperature sensing circuit and gain adjusting circuit, allowing for adjustable audio signal gain based on the temperature of the audio receiver module, enabling simultaneous playback with both the audio receiver and loudspeaker modules, and separate gain adjustment for each module to optimize volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the size of the handheld electronic device is reduced, then the portability is improved, but the audio volume and playback effect deteriorate
Solution Approach 1:
The audio output function is segmented into two independent paths: one through the audio receiver module (earphone jack) and another through the loudspeaker module. This allows each module to operate independently or simultaneously, enabling the system to achieve sufficient audio volume even when the overall device size is reduced. The segmentation resolves the contradiction by distributing the audio output load across multiple channels rather than relying on a single oversized loudspeaker.
Solution Approach 2:
The patent transitions from a single-dimension audio output (one loudspeaker) to a multi-dimensional audio output system that includes both audio receiver module and loudspeaker module operating in different spatial and functional dimensions. This dimensional expansion allows the system to achieve better playback effects and sufficient volume without increasing device size, as the audio output is now distributed across multiple spatial channels (earphone jack and external speaker).
2Device complexity
If a single loudspeaker module is used, then the device complexity is reduced, but the stereo sound effect and playback quality deteriorate
Solution Approach 1:
The audio system is segmented into distinct functional modules: audio receiver module and loudspeaker module, each with independent control circuits. This segmentation enables the system to achieve stereo sound effects and better playback quality by utilizing multiple modules, while the modular architecture actually simplifies the overall system design and reduces complexity compared to a single integrated loudspeaker system.
Solution Approach 2:
The audio playback device is designed with multi-functionality, allowing it to operate in multiple modes: audio receiver mode only, loudspeaker mode only, or combined mode with both modules operating simultaneously. This universal design enables the system to adapt to different usage scenarios and achieve superior playback effects without significantly increasing device complexity, as the same hardware infrastructure supports multiple operational configurations.
3Power
If the gain of the audio receiver module is increased to match the loudspeaker volume, then the audio volume balance is improved, but the audio receiver module temperature increases
Solution Approach 1:
The patent implements a feedback mechanism through the temperature sensing circuit that continuously monitors the temperature of the audio receiver module. Based on the temperature feedback, the control circuit dynamically adjusts the gain of the audio receiver module to maintain optimal audio output volume while preventing excessive temperature increase. This closed-loop control resolves the contradiction by automatically balancing audio volume and temperature management.
Solution Approach 2:
The gain of the audio receiver module is designed to be dynamic rather than fixed. The control circuit adjusts the gain in real-time based on operating conditions, particularly temperature levels. When temperature rises, the gain is automatically reduced to prevent overheating; when temperature is acceptable, the gain is increased to maintain audio volume balance with the loudspeaker. This dynamic adjustment resolves the contradiction between audio volume and temperature management.
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 solution allows for improved audio playback by increasing the gain of the audio receiver module within tolerable limits, enabling louder and more balanced audio output comparable to the loudspeaker module, thus enhancing the overall playback experience.
Implementation Method 1
The first temperature sensing circuit is configured to sense a temperature of the audio receiver module
Data Source
AI summary
An audio playback device that includes an audio receiver module, a loudspeaker module and an audio control circuit is provided. The audio control circuit includes an interface and a gain adjusting module. The interface receives an audio signal from an audio source. Under a first operation mode, the audio signal is transmitted only to the audio receiver module to be playback. Under a second operation mode, the audio signal is transmitted to the audio receiver module and to the loudspeaker module to be playback. The gain adjusting module includes a temperature sensing circuit to sense a temperature of the audio receiver module and a gain adjusting circuit electrically coupled between the audio interface and the audio receiver module to adjust a gain of the audio signal according to the temperature.