Wireless Microphone Master Device Synchronization
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Solution Overview
Problem
Existing wireless microphone systems using time division multiplex communication are limited in the number of communication channels they can establish, restricting the number of microphones that can be connected and resulting in poor voice quality due to limited slots in each frame period.
Innovation Solution
A communication apparatus and method that generates a table for carrier waves and slots for each microphone, allowing for communication with more microphones than the default number of slots in a frame period, using multiple wireless processing units operating synchronously to increase the number of communicable channels beyond the conventional limit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time division multiplex communication is used with a default number of slots per frame period, then communication can be maintained with limited channels, but the number of communicable microphones is limited and voice quality deteriorates
Solution Approach 1:
The system segments the communication function into multiple wireless processing units (k units), where each unit can independently handle communication with microphones. This segmentation allows the master device to establish more communication channels by distributing the communication load across multiple units, thereby increasing the number of communicable microphones beyond the default slot limitation while maintaining communication stability through synchronized operation based on the same clock signal
Solution Approach 2:
The invention introduces a new dimension to the communication architecture by adding multiple wireless processing units operating in parallel. Instead of relying solely on increasing slots within a single frame period (one-dimensional approach), the system expands to multiple processing units that can simultaneously handle multiple microphones, effectively creating additional communication channels through spatial/temporal parallelism while maintaining synchronization through a shared clock signal
2Quantity of substance
If the number of slots per frame period is increased to support more microphones, then more microphones can be connected, but phase shifts and slot deviations occur degrading voice quality
Solution Approach 1:
The system merges multiple wireless processing units under a unified synchronization mechanism (common clock signal). By combining the operations of k wireless processing units and coordinating them through the same clock signal, the system can support more communicable channels while preventing phase shifts and slot deviations. The unified synchronization approach ensures that all processing units operate in harmony, maintaining temporal alignment across multiple channels
Solution Approach 2:
The system implements feedback control through synchronized operation of multiple wireless processing units based on a common clock signal. Each processing unit adjusts its operation to maintain alignment with the shared clock reference, creating a feedback mechanism that continuously corrects potential phase shifts or slot deviations. This feedback approach ensures that as more channels are added, synchronization stability is maintained through continuous reference to the master clock signal
Data Source
AI summary
In a wireless microphone system, a master device includes a master device control unit that generates a communication table in which a pair of a carrier wave and a slot which are used for communication with m microphone slave devices are set for one frame period, based on a total number of six carrier waves in a DECT system and n slots constituting one frame period of the DECT system, and k wireless processing units that perform communication using the DECT system with corresponding individual microphone slave devices among m microphone slave devices, based on the generated communication table. The k wireless processing units respectively operate synchronously based on the same clock signal.