Signal Synchronization Circuit for Multi-Microphone Arrays
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Solution Overview
Problem
Existing signal processing devices face challenges in accurately synchronizing signals from multiple microphones with a small calculation amount, which is essential for effective signal processing.
Innovation Solution
A signal synchronization circuit comprising a detector, setter, delayers, filter, and controller, which detects sound sources, sets processing periods, delays signals, performs filtering, and controls operations to minimize signal differences between delayed and filtered signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cross-correlation function is used to synchronize signals from multiple microphones, then synchronization accuracy is improved, but calculation amount increases
Solution Approach 1:
The patent segments the signal processing into distinct functional blocks: detector for sound source identification, delayers for time alignment, filter for signal processing, and controller for coordination. This segmentation allows each component to perform a specific function efficiently, reducing overall calculation complexity while maintaining synchronization accuracy.
Solution Approach 2:
The detector performs preliminary action by detecting the sound source before synchronization processing. The controller uses this detection result to set the processing period and control the delayers and filter in advance, preparing the system for efficient synchronization without requiring intensive cross-correlation calculations on all signals.
2Measurement precision
If processing period is extended to improve synchronization accuracy, then measurement precision is improved, but time consumption increases
Solution Approach 1:
The processing period is made dynamic rather than fixed. The controller adjusts the processing period based on the sound source detection results, extending it when needed for accurate synchronization and shortening it when conditions allow, thus balancing accuracy requirements with time efficiency in different operational scenarios.
Solution Approach 2:
The patent changes the parameter of processing period duration based on detection results. By dynamically adjusting this parameter, the system achieves high synchronization accuracy when necessary while minimizing processing time during normal operation, resolving the contradiction between precision and time consumption.
Data Source
AI summary
A signal synchronization circuit of the invention includes: a detector that detects a sound source, based on a second signal out of a first signal supplied from a first microphone and the second signal supplied from a second microphone; a setter that sets a processing period, based on a result of detecting by the detector; a first delayer that delays the first signal; a second delayer that delays the second signal; a filter that generates a third signal by performing filtering processing, based on the second signal delayed by the second delayer; and a controller that controls operations of the first delayer, the second delayer, and the filter in the processing period to cause a signal difference between the first signal delayed by the first delayer and the third signal to become small.