Hearing Device Data Transmission Clock Skew Compensation
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Solution Overview
Problem
Current data transmission methods between hearing devices and external units face inefficiencies due to the lack of a common clock signal, leading to reduced bandwidth and increased data packet repetitions, especially under unfavorable transmission conditions, which affects the reliability and speed of data transfer and battery life.
Innovation Solution
Implementing a method where a predefinable fixed period of time is used between the receipt of a first data packet and the transmission of a second data packet, allowing for clock skew correction and reducing the need for data packet repetitions, thereby enhancing transmission reliability and speed, and incorporating a synchronization sequence in the first data packet to synchronize clock signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate frequency-stable clock sources are used for the hearing device and external unit, then data transmission can occur without a common clock signal, but clock signal divergence occurs requiring regular synchronization
Solution Approach 1:
The patent implements a feedback mechanism where the hearing device measures the time interval between receiving a data packet and transmitting its response packet, then communicates this measurement back to the external unit. The external unit uses this feedback to calculate and compensate for clock skew, thereby maintaining synchronization without requiring a common clock signal.
Solution Approach 2:
The system enables each device to serve itself by having the hearing device autonomously measure its own transmission timing relative to received packets, and the external unit autonomously calculate and apply clock skew compensation based on the received measurements, eliminating the need for external synchronization infrastructure.
2Reliability
If clock recovery through return-to-zero coding or Manchester coding is used, then clock signals are continuously synchronized, but bandwidth available for user data is reduced
Solution Approach 1:
The patent extracts the clock synchronization function from the data stream itself by using separate timing measurement and communication mechanisms. Instead of embedding clock information within the data packets through coding schemes, the system measures time intervals separately and communicates timing corrections through dedicated synchronization packets, thereby freeing up bandwidth for user data.
Solution Approach 2:
The patent introduces an intermediary timing measurement mechanism that acts as a mediator between the clock signals of the two devices. Rather than directly encoding clock information in the data stream, the system uses measured time intervals as an intermediary to infer and correct clock skew, separating the synchronization function from the data transmission function.
3Reliability
If packet-oriented data transmission with synchronization sequences is used, then clock signals can be synchronized at the start of each data packet, but data packet repetitions are required under unfavorable transmission conditions
Solution Approach 1:
The patent applies preliminary action by having the external unit calculate clock skew compensation values in advance based on timing measurements from previous exchanges, and embed these compensation values in synchronization packets before data transmission begins. This preliminary preparation reduces the need for retransmissions by ensuring better initial synchronization.
Solution Approach 2:
The system uses feedback from timing measurements to continuously refine clock skew compensation values, which are then applied to improve data packet transmission reliability. The feedback loop allows the system to adapt to changing transmission conditions and reduce repetitions.
4Reliability
If data packet repetitions are performed under unfavorable transmission conditions, then transmission reliability is maintained, but transmission speed is reduced
Solution Approach 1:
The patent implements feedback through timing measurements and clock skew compensation that proactively addresses transmission reliability issues before they manifest as packet loss. By continuously measuring time intervals and adjusting synchronization, the system reduces the need for reactive retransmissions, thereby maintaining higher effective transmission speeds.
Solution Approach 2:
The system enables self-service by having each device autonomously measure and compensate for timing variations, allowing the transmission system to adapt to unfavorable conditions without external intervention or repeated transmissions. This self-adjusting capability maintains reliability while preserving transmission speed.
Data Source
AI summary
A method and an associated configuration transmit data between a hearing device and an external unit. A first data packet is transmitted to the hearing device by the external unit. The first data packet is received by the hearing device and a second data packet is transmitted from the hearing device to the external unit. A predefinable fixed period of time elapses between the end of the receipt of the first data packet and the start of transmission of the second data packet. The external unit thereby “knows” when the first bit of the second data packet is to arrive. This offers the advantage that the reliability of a data transmission is improved. In the case of a packet-oriented data transmission fewer data packet repetitions are required, as a result of which the transmission speed increases.