Speaker Drive Signal Modeling for Accurate Sound Emulation
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Solution Overview
Problem
Existing speaker technologies face challenges in replicating the sound characteristics of one speaker using another, as adjusting frequency responses alone is insufficient to achieve desired sound outputs, particularly in mimicking sounds from different speakers.
Innovation Solution
A speaker driving device that calculates and generates drive signals based on parameters defining the equivalent circuit of both a target speaker unit and a driving speaker unit, allowing for precise emulation of sound characteristics by matching the diaphragm position information and frequency responses between the two units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequency response adjustment is applied to emulate sound characteristics, then sound characteristics can be modified, but the emulation accuracy is insufficient to replicate target speaker sound
Solution Approach 1:
The patent changes the parameters used for sound emulation from simple frequency response adjustments to comprehensive equivalent circuit parameters (mechanical resistance, stiffness, mass) that fully characterize the speaker's physical properties. This enables accurate replication of target speaker characteristics by matching these fundamental parameters between driver and target speakers.
Solution Approach 2:
The patent replaces direct physical replication of speaker mechanics with an electrical signal processing approach. By calculating drive signals based on equivalent circuit parameters and using signal processing to emulate the mechanical behavior, the system achieves accurate sound emulation without physically copying the target speaker's mechanical structure.
2Manufacturing precision
If equivalent circuit parameters are used to calculate drive signals, then sound characteristics can be accurately replicated, but the calculation complexity and processing requirements increase
Solution Approach 1:
The patent performs preliminary calculations of the equivalent circuit parameters and drive signal characteristics before actual sound reproduction. By pre-calculating the relationships between driver speaker parameters, target speaker parameters, and required drive signals, the system establishes a framework that simplifies real-time operation while maintaining high accuracy.
Solution Approach 2:
The patent introduces an intermediary calculation system that bridges the driver speaker and target speaker. This intermediary process computes the equivalent circuit parameters and determines the optimal drive signal characteristics, acting as a mediator that translates between the physical properties of different speakers and the electrical signals needed for accurate emulation.
3Measurement precision
If drive signals are generated based on both driver and target speaker parameters, then accurate sound emulation is achieved, but the processing time and computational load increase
Solution Approach 1:
The patent performs preliminary determination of equivalent circuit parameters and drive signal characteristics before actual playback. By pre-calculating the relationships between speaker parameters and required drive signals, the system reduces real-time processing requirements while maintaining high accuracy in diaphragm position matching and sound reproduction.
Data Source
AI summary
A speaker driving device including a setting part setting at least one parameter defining an equivalent circuit of a first speaker unit as a first parameter; a first calculator configured to change a first frequency response based on the first parameter, the changed first frequency response being applied to an input signal; and a driving signal generator configured to generate a drive signal for driving a speaker unit based on a first calculation signal, the first calculation signal being obtained by applying the changed first frequency response to the input signal.