Stereo Audio Processing With Sampling-Frequency Sync Pulses
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing audio systems with separate processors for each channel experience phase differences due to sequential software resets, leading to inconsistent audio outputs between channels.
Innovation Solution
A device and method that uses synchronization signals with aligned pulses at the sampling frequency to initiate audio signal processing simultaneously across channels, eliminating the need for phase detection and calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sequential software reset is used for two processors, then device complexity is reduced, but phase difference between channels occurs
Solution Approach 1:
The patent applies preliminary action by having the main processor generate and send synchronization signals to the audio processors before the actual audio signal processing begins. These synchronization signals are prepared in advance and transmitted through the I2S interface, ensuring that both audio processors start their processing at the same time reference point, thereby eliminating phase differences without requiring complex hardware reset mechanisms.
2Manufacturing precision
If hardware reset with simultaneous resetting signal is used, then phase synchronization is achieved, but device complexity increases
Solution Approach 1:
The patent uses an intermediary approach by introducing synchronization signals as a mediator between the main processor and audio processors. Instead of directly controlling the reset mechanism or using complex hardware timing circuits, the main processor generates synchronization signals that are transmitted through the I2S interface to coordinate the start of audio processing in both channels, achieving phase synchronization with simpler overall system architecture.
3Ease of operation
If sequential software reset is used, then ease of operation is improved, but audio output consistency deteriorates
Solution Approach 1:
The patent implements feedback by having the main processor continuously monitor and generate synchronization signals based on the I2S interface timing. The synchronization signals are fed back to the audio processors to ensure they start processing at the correct time reference, creating a closed-loop system that maintains audio output consistency across both channels while keeping the reset operation simple through software control.
Data Source
AI summary
A device for audio signal processing includes a main processor and two audio processors electrically connected with the main processor. Each audio processor corresponds to a channel of a stereo audio output. The main processor provides an indication signal for the two audio processors. Each audio processor generates a synchronization signal according to the indication signal and performs audio signal processing according to the synchronization signal. The synchronization signals begin simultaneously and have the same frequencies that equal a sampling frequency. Each synchronization signal includes at least one pulse, and a start of each pulse of each synchronization signal is aligned in time with a start of a pulse of the indication signal. The audio signal processing performed by each audio processor begins at an end of one of the at least one pulse in the synchronization signal corresponding to the audio processor.