Bluetooth Controller Slot Timing Adjustment for Audible Noise Reduction
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Solution Overview
Problem
Traditional Bluetooth communication devices generate noise perceivable by humans due to Bluetooth signals falling within human ear frequency ranges, affecting user experience and potentially causing discomfort.
Innovation Solution
A Bluetooth controller circuit that dynamically adjusts transmission slot timing by generating a second count value with non-linear changes, altering the intervals between transmission slots and events to break periodicity, thereby reducing noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Bluetooth transmission slots are conducted periodically according to Bluetooth communication protocols, then Bluetooth packet transmission efficiency is improved, but noise perceivable by human ears is generated
Solution Approach 1:
The patent applies dynamics by making the transmission slot timing adjustable rather than fixed. The controller circuit dynamically modifies the timing of transmission slots based on counted clock cycles, creating variable intervals between transmissions. This transforms the static periodic transmission into a dynamic system that can adapt timing to avoid human-perceivable frequencies while maintaining communication efficiency.
Solution Approach 2:
The patent changes the timing parameter of transmission slots from a fixed periodic value to a variable value determined by counting clock cycles and applying non-linear adjustment. By modifying the time interval parameter between transmission slots, the system shifts the signal frequency away from the 20Hz-20kHz range perceivable by humans, thereby reducing audible noise while preserving transmission productivity.
2Object-affected harmful factors
If transmission slot timing is adjusted to break periodicity and reduce noise, then noise perception is reduced, but device complexity increases
Solution Approach 1:
The controller circuit performs self-service by autonomously counting clock cycles and automatically adjusting transmission slot timing without external intervention. The built-in counter and timing adjustment logic enable the device to self-regulate its transmission schedule, eliminating the need for additional external control mechanisms and minimizing the increase in overall system complexity.
Solution Approach 2:
The patent introduces a clock counter as an intermediary component between the reference clock signal and the transmission slot timing control. This intermediary counts clock cycles and provides adjusted timing information to the transmission controller, effectively mediating the timing adjustment function with minimal added complexity rather than requiring direct complex control logic.
3Ease of operation
If fixed periodic transmission slots are used, then transmission timing is simple and predictable, but electromagnetic interference occurs at specific frequencies
Solution Approach 1:
The patent uses periodic action by continuing to transmit Bluetooth packets at regular intervals determined by counted clock cycles, maintaining the periodic nature of transmission while changing the specific period duration. The transmission remains periodic in structure but varies in timing parameters to avoid fixed frequency interference, thus preserving operational simplicity while reducing electromagnetic interference.
Data Source
AI summary
A Bluetooth controller circuit includes: a clock counter arranged to operably generate a first count value corresponding to a reference clock signal; a count value adjusting circuit arranged to operably generate a second count value according to the first count value; a time slot determining circuit arranged to operably determine timing of respective transmission slots according to the second count value; a transceiver circuit arranged to operably transmit Bluetooth signal in transmission slots determined by the time slot determining circuit; and a control circuit, coupled with the count value adjusting circuit, the time slot determining circuit, and the transceiver circuit, and arranged to operably control operations of the count value adjusting circuit, the time slot determining circuit, and the transceiver circuit.


