Clock Synchronization During Analog Digital Mode Switching
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Solution Overview
Problem
The existing communication systems face delays in clock synchronization when switching between digital and analog transmission modes, particularly during station identification, which can be problematic for time-sensitive data transmission in applications like financial trading.
Innovation Solution
A digital low bit rate clock synchronization signal is embedded in the AM station ID signal to maintain synchronization between the transmitter and receiver, eliminating the delay caused by reestablishing clock synchronization when switching back to digital transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitter switches to AM broadcast signal for station identification, then the broadcast function is fulfilled, but the clock synchronization is interrupted causing delay when switching back to digital transmission
Solution Approach 1:
The system transmits a digital clock synchronization signal at a low bit rate during the AM station ID broadcast, preparing and maintaining synchronization information in advance. This preliminary transmission of sync data ensures that when switching back to digital mode, the receiver already has the necessary synchronization information, eliminating the delay that would normally occur during reestablishment of clock synchronization.
Solution Approach 2:
A digital clock synchronization signal serves as an intermediary between the AM broadcast signal and the digital data transmission. This intermediate signal carries timing information through the AM broadcast channel, acting as a bridge that maintains synchronization continuity across the mode transition without requiring full digital transmission infrastructure during the broadcast interval.
2Reliability
If a digital clock synchronization signal is embedded in the AM station ID signal, then clock synchronization continuity is maintained, but the complexity of the broadcast signal increases
Solution Approach 1:
The AM station ID signal is enhanced with a specific local property: a digital clock synchronization signal embedded at a low bit rate. Rather than fundamentally changing the entire broadcast system, only the station ID portion is modified to include this additional synchronization information. This localized enhancement maintains simplicity elsewhere in the system while achieving the goal of continuous synchronization.
Solution Approach 2:
The clock synchronization signal is transmitted at a reduced bit rate during the AM broadcast portion. By changing the data rate parameter to a lower value, the system can embed synchronization information in the AM signal without requiring the full bandwidth and processing capacity of the digital data mode, thus managing complexity while maintaining synchronization functionality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This technique ensures immediate and uninterrupted clock synchronization, reducing latency and enabling faster data transmission in both data transmission and broadcast modes, particularly in applications requiring low latency.
Implementation Method 1
In one form, the digital low bit rate clock synchronization signal is modulated using phase modulation, but it can be modulated in other ways.
Data Source
AI summary
A communication system allows for clock synchronization between a transmitter and a receiver when switching from transmission of an analog signal to transmission of a digital signal. The system uses clock synchronization during transmission of the digital signal, but the clock synchronization may be lost when switching to transmission of an analog signal. A digital clock synchronization is embedded in the analog signal so that the clock synchronization between the transmitter and the receiver may be reestablished upon switching to a digital signal without any delay in transmission of the digital signal.