Microphone Array With Four-Channel Serial Peripheral Interface
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Solution Overview
Problem
Conventional microphone arrays require multiple dedicated data transmission and clock signal lines, increasing circuit complexity and manufacturing costs, and face challenges in signal synchronization and data transmission reliability.
Innovation Solution
A four-channel serial peripheral interface with a core logic unit, data receiving unit, and voice recognition unit, featuring a frequency divider module, shift register, buffer, and data reconstruction module to synchronize clock signals and reconstruct interleaved data for independent processing of each microphone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple dedicated data transmission and clock signal lines are used for each digital microphone, then signal transmission reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges multiple separate data transmission lines and clock signal lines into a single shared transmission medium. By encoding data from multiple microphones onto one data line using time-division multiplexing and identifying each microphone's data through a unique ID, the system eliminates the need for dedicated lines per microphone, thereby reducing circuit complexity while maintaining reliable signal transmission through the shared infrastructure.
Solution Approach 2:
The patent implements a universal data transmission interface where a single data line and clock signal line serve multiple microphones simultaneously. The interface is designed to handle data from any number of microphones by incorporating ID identification and time-division multiplexing, making the transmission system multi-functional and adaptable to different microphone configurations without requiring additional dedicated lines.
2Reliability
If multiple dedicated data transmission and clock signal lines are used for each digital microphone, then data transmission reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple separate signal lines into a single shared data transmission line, directly reducing the bill of materials and assembly complexity. This merging approach eliminates the need to manufacture and connect multiple dedicated lines for each microphone, thereby lowering manufacturing costs while maintaining data transmission reliability through intelligent encoding and ID-based identification of microphone data.
3Measurement precision
If separately controlling and receiving signal from a single digital microphone is performed, then signal processing accuracy is improved, but data transmission speed decreases
Solution Approach 1:
The patent enables continuous data transmission from all microphones simultaneously by implementing time-division multiplexing on a shared data line. Instead of sequentially accessing each microphone (which would maintain accuracy but reduce speed), the system continuously receives interleaved data streams from all microphones in parallel, then separates and processes them individually to maintain signal processing accuracy while achieving higher overall data transmission speed.
Data Source
AI summary
A microphone array includes a four-channel serial peripheral interface, a core logic unit, a data receiving unit and a voice recognition unit. The four-channel serial peripheral interface includes a bit clock signal line, a frame clock signal line, and four data signal lines, the core logic unit includes a frequency divider module for converting the control signal and the clock signal to provide a bit clock signal and a frame clock signal. The data receiving unit includes a shift register and a buffer, the shift register is connected to four data signal lines and receives input data of the four digital microphones, and the buffer is connected to the shift register. The voice recognition unit is connected to the data receiving unit and receives microphone signals of the four digital microphones to perform voice recognition.