Stereo MEMS Microphone I2S Routing for Sub-0.1 ms Latency
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Solution Overview
Problem
Existing audio recording technologies suffer from significant latency issues due to the need for processing audio data through processors, which introduces undesirable delays in live performances and multi-track recordings.
Innovation Solution
Directly routing serial audio data from MEMS microphones to digital-to-analog converters using I2S timing signals, bypassing processor manipulation, thereby reducing latency to less than 0.1 mSec.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If audio data is routed through a processor for manipulation, then audio processing capability is improved, but latency increases significantly
Solution Approach 1:
The patent extracts the audio data transmission path from the processor, routing serial audio data directly from MEMS microphones to digital-to-analog converters while bypassing the processor. The processor retains only timing signal generation functions, separating data processing from timing control to eliminate processing-induced latency.
Solution Approach 2:
The patent introduces I2S timing signals as an intermediary mechanism that enables direct communication between microphones and converters. These timing signals coordinate the direct data path without requiring processor intervention, allowing low-latency audio transmission while maintaining system synchronization.
2Loss of time
If I2S timing signals are used for direct routing, then latency is reduced to less than 0.1 mSec, but device complexity increases
Solution Approach 1:
The patent leverages the multi-functionality of the I2S interface, which simultaneously handles both timing signal generation and audio data transmission. This standardized protocol enables direct microphone-to-converter routing while reusing existing interface circuitry, reducing the need for additional dedicated components.
Solution Approach 2:
The system uses the processor's existing I2S interface capabilities to self-generate the necessary timing signals for direct audio routing. The processor's built-in peripherals provide the clock and data synchronization signals needed for low-latency transmission without requiring external timing circuitry.
Data Source
AI summary
The Low Latency Stereo Analog Digital MEMS Microphones for Audio Live Performance and Multi-Track Recording (i.e. the Invention) takes serial audio digital data from one (mono) or two (stereo) MEMS microphones and sends the data directly to a mono or stereo digital-to-analog converter (thereby eliminating processing latency in a original and unique design implementation) which generates an analog line voltage signal for use by commercially available audio amplifiers and recording devices.