Single-Amplifier Speaker Circuit With Frequency Split and Anti-Phase Muffling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sounding device circuits in portable mobile electronic products require multiple power amplifiers and have a complex, non-integrated structure, which is not conducive to wide application.
Innovation Solution
A circuit design that integrates a single power amplifier to drive both low-frequency and high-frequency sound generation, using a single power amplifier to split sound signals into low and high frequencies through a capacitor, with a coaxial arrangement of vibration systems for both functions, allowing the high-frequency module to also function as a receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple power amplifiers and independent speakers are used for low-frequency sound, high-frequency sound, and receiver functions, then the acoustic performance and functionality are improved, but the device complexity and number of components increase
Solution Approach 1:
The patent combines multiple independent speakers (low-frequency speaker, high-frequency speaker, and receiver) into a single integrated speaker unit. This single speaker includes a voice coil assembly that can function as both a high-frequency driver and a receiver, and a diaphragm assembly that functions as a low-frequency driver. The merging reduces the number of separate components while maintaining all required functions through clever mechanical and electrical integration.
Solution Approach 2:
The voice coil assembly serves multiple functions: it acts as a high-frequency speaker driver, a receiver for receiving sound waves, and works in conjunction with the diaphragm assembly for low-frequency sound generation. This multi-functional design eliminates the need for separate dedicated components for each function, thereby reducing overall device complexity while preserving versatility.
2Reliability
If multiple independent speakers with separate drivers are used, then the acoustic performance for different frequency ranges is improved, but the ease of manufacture and integration are worsened
Solution Approach 1:
The patent merges multiple speaker functions into a single integrated assembly where the voice coil assembly and diaphragm assembly work together as one unit. This integration simplifies the manufacturing process by reducing the number of separate assembly steps and components that need to be manufactured and assembled independently, while still achieving the desired acoustic performance across different frequency ranges.
3Power
If at least two power amplifiers are used to drive multiple speakers, then the driving capability for different frequency ranges is improved, but the device complexity and cost increase
Solution Approach 1:
The patent employs a single power amplifier that universally drives both the voice coil assembly (for high-frequency sound and receiving) and the diaphragm assembly (for low-frequency sound). This single power amplifier is capable of providing the necessary driving power across different frequency ranges by controlling the different speaker assemblies, thereby eliminating the need for multiple separate power amplifiers and reducing circuit complexity.
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
The circuit achieves a simplified structure that can generate both low and high frequencies with a single power amplifier, providing wide application and good acoustic performance, including anti-phase muffling capabilities.
Implementation Method 1
a capacitor having a first end connecting to an output end of the power amplifier, and a second end connecting to the first input end of the high frequency sounding module
Implementation Method 2
a power amplifier having a positive end connected to the first sound signal input end, and a negative end connecting to ground
Implementation Method 3
a first voice coil fixed on the first diaphragm; the second voice coil that drives the second diaphragm to vibrate and produce sound
Data Source
AI summary
The present invention provides a circuit, which includes a first sound signal input end, a second sound signal input end, a power amplifier, a capacitor, a low frequency sounding module and a high frequency sounding module. The present invention also provides a sounding device applying the circuit provided by the present invention. Compared with the related art, the present invention provides a sounding device with simplified structure and wide application.