Acoustic Sensor Signal Processing for Shared Pin Communication
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Solution Overview
Problem
Conventional acoustic sensor technologies require dedicated pins for bi-directional communication, which constrains circuit board space and causes interference between communication and audio output signaling.
Innovation Solution
Implementing signal processing techniques such as common mode signaling, time division multiplexing, and frequency separation to superimpose data communication on audio output signaling using shared pins, reducing the need for additional pins and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated pins are used for bi-directional communication interfaces (I2C, SPI, SoundWire), then reliable data communication is achieved, but circuit board space is consumed and additional pins (2-4 per device) are required
Solution Approach 1:
The patent combines audio output signaling and data communication into a single shared pin or pin pair. The audio output signals are transmitted on the shared pin, while data communication is achieved by superimposing communication signals on the same pin, eliminating the need for separate dedicated communication pins and reducing circuit board space requirements
Solution Approach 2:
The shared pin performs multiple functions: it serves as an audio output channel for transmitting audio signals and simultaneously functions as a communication channel for bi-directional data exchange. This multi-functionality allows the system to maintain both audio output and reliable data communication without requiring additional dedicated pins
2Adaptability or versatility
If dedicated pins are used for bi-directional communication interfaces, then communication functionality is achieved, but interference between communication and audio output signaling occurs
Solution Approach 1:
The patent employs time-division multiplexing where the shared pin alternates between audio output mode and communication mode in periodic time slots. During audio phases, audio signals are transmitted; during communication phases, bi-directional data exchange occurs. This periodic switching eliminates simultaneous signal conflicts and prevents interference between audio output and communication signals
Solution Approach 2:
The patent changes signal parameters (frequency, amplitude, timing) to distinguish between audio output and communication functions on the shared pin. By modulating communication signals at frequencies or with timing patterns distinct from audio signals, the system enables reliable differentiation and prevents signal interference while maintaining both functionalities
Data Source
AI summary
Signal processing for an acoustic sensor bi-directional communication channel is presented herein. The acoustic sensor can comprise a micro-electro-mechanical system (MEMS) transducer configured to generate, based on an acoustic pressure, an audio output; and a bi-directional communication component configured to send and/or receive data that has been superimposed on the audio output using common mode signaling, time division multiplexing, or frequency separation. In an example, a signal processing component is configured to send the audio output directed to an external device utilizing differential mode signaling between respective pins of the acoustic sensor; and send the data utilizing the common mode signaling comprising a sum of voltages of the respective pins. In other examples, the signal processing component is configured to send and/or receive the data, and send the audio output, during different time periods; or send the data based on a frequency range outside an audio band.