MEMS Digital Microphone Low Data Rate Interface
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Solution Overview
Problem
Digital microphones with high data rate interfaces consume high power, limiting their use in portable devices due to always-on nature and high power consumption, necessitating a solution to reduce power consumption without compromising performance.
Innovation Solution
A MEMS system with a feature extraction component and a low data rate interface, where the feature extraction component extracts key features from the MEMS device's output signal, and these features are transmitted through a low data rate interface, reducing power consumption by minimizing the data rate and clock rate, and integrating the MEMS device, feature extraction component, and low data rate interface in a semiconductor package.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high data rate interface is used in digital microphones, then high quality digital output signals can be achieved, but power consumption increases significantly
Solution Approach 1:
The patent extracts only the essential features from the audio signal (such as spectral coefficients, temporal features, or compressed representations) rather than transmitting the full high-resolution digital audio stream. This feature extraction component reduces the data rate while preserving the most important auditory information, thereby lowering power consumption while maintaining perceptual quality.
Solution Approach 2:
The patent changes the representation parameters of the audio signal from full-resolution time-domain samples to a compressed feature space (such as frequency domain coefficients or extracted acoustic features). This parameter transformation enables lower data rates while maintaining the essential characteristics needed for audio processing and perception.
2Measurement precision
If digital signal processing circuitry is always on to maintain high quality output, then signal quality is preserved, but battery life is significantly reduced
Solution Approach 1:
The patent implements periodic feature extraction and transmission instead of continuous high-rate digital signal processing. By extracting features at lower rates and transmitting only essential information, the system can enter lower power states between feature extraction intervals, significantly extending battery life while maintaining audio quality during active processing periods.
3Loss of information
If full digital audio signals are transmitted, then complete audio information is available, but data rate and power consumption increase
Solution Approach 1:
The patent extracts and transmits only the most salient features from the audio signal that are necessary for maintaining audio quality and enabling downstream processing. This selective extraction removes redundant information while preserving essential auditory characteristics, achieving lower data rates without significant loss of perceptual quality.
Data Source
AI summary
A MicroElectroMechanical System (MEMS) includes a MEMS device; a feature extraction component coupled to an output of the MEMS device, wherein the feature extraction component is configured to provide a plurality of features of an output signal of the MEMS device; and a low data rate interface coupled to the feature extraction components, wherein the low data rate interface is configured to transmit the plurality of features of the output signal of the MEMS device, and wherein a low data rate of the low data rate interface is determined by a number of the plurality of features transmitted, wherein the MEMS device, the feature extraction component, and the low data rate interface are packaged together in a semiconductor package.