Speaker Driving Device Crosstalk Cancellation
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Solution Overview
Problem
Conventional speaker systems fail to accurately reproduce binaural sound sources due to crosstalk sounds, which affect sound image localization and quality, especially when using speakers instead of headphones.
Innovation Solution
A speaker driving device that includes calculation units and signal generation units to process audio signals based on response characteristics of speaker units, generating driving signals that cancel crosstalk sounds by simulating the movement of speaker diaphragms, allowing for accurate sound image localization similar to headphones while maintaining sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If binaural sound source is reproduced by speaker, then sound reproduction is achieved, but crosstalk sound degrades sound image localization and quality
Solution Approach 1:
The patent applies preliminary anti-action by generating an anti-crosstalk signal that preemptively counteracts the harmful crosstalk sound before it reaches the listener's ears. The anti-crosstalk signal is created by calculating the transfer function characteristics and generating a signal with opposite polarity to the crosstalk component, thereby canceling it out and improving sound image localization accuracy.
Solution Approach 2:
The patent converts the harmful crosstalk sound into a beneficial effect by using the crosstalk cancellation technology. The system measures and calculates the transfer function that characterizes the crosstalk path, then uses this information to generate a cancellation signal that transforms the harmful crosstalk into a useful mechanism for achieving accurate binaural sound reproduction through speakers.
2Object-generated harmful factors
If delayed sound signal is used to cancel crosstalk, then crosstalk cancellation is achieved, but listening position is restricted to a narrow range
Solution Approach 1:
The patent applies parameter changes by using transfer function characteristics that vary with frequency and spatial position. Instead of a fixed delay time, the system calculates frequency-dependent transfer functions that adapt to different listening positions. This allows the crosstalk cancellation to remain effective across a wider range of listening positions by adjusting the cancellation parameters based on the measured or predetermined transfer function.
3Object-generated harmful factors
If transfer function method is used to remove spatial crosstalk, then crosstalk removal is achieved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing transfer function characteristics for multiple frequency bands and listening positions before actual sound reproduction. This preprocessing step creates lookup tables or predetermined data that can be quickly referenced during playback, avoiding the need for real-time complex calculations and reducing the computational burden on the signal processing system.
Data Source
AI summary
A speaker driving device includes a first calculation unit, a first driving signal generation unit and a third calculation unit. The first calculation unit outputs a first calculation signal obtained from a first input signal based on response characteristics according to a first parameter defining an equivalent circuit of a first speaker unit. The first driving signal generation unit generates a first driving signal based on a second driving signal and the first calculation signal. The first driving signal drives a first output speaker unit. The third calculation unit generates a third calculation signal from a second input signal based on response characteristics according to a third parameter defining an equivalent circuit of a third speaker unit. The second driving signal generation unit generates the second driving signal based on the first driving signal and the third calculation signal. The second driving signal drive a second output speaker unit.