Block Multiplexing for Multi-Rate Signal Synchronization
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Solution Overview
Problem
Existing multiplexing technologies struggle to efficiently multiplex data signals with different frequency information and bit rates, leading to challenges in synchronizing data rates between input and output channels, which results in data loss and requires large circuit scales, making them unsuitable for downsizing LSIs.
Innovation Solution
A data multiplexer system comprising a transmitter apparatus that divides input data into blocks and multiplexes them, and a receiver apparatus that adjusts clock frequencies to match the data rates, ensuring synchronization and retaining frequency information across channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional multiplexing is used to multiplex data signals with different frequency information and bit rates, then data rate synchronization between input and output channels cannot be achieved, but circuit scale increases and data loss occurs
Solution Approach 1:
The patent segments the multiplexing process into distinct functional blocks: a frequency information extraction unit that separates frequency information from input signals, a frequency control unit that processes this information, and a data rate adjustment unit that modifies output signals. This segmentation allows each block to perform its specific function efficiently, achieving reliable data rate synchronization without requiring a monolithic complex circuit.
Solution Approach 2:
The patent introduces frequency information as an intermediary element that mediates between the input signals with different bit rates and the output channels. By extracting and transmitting frequency information separately, the system can adjust data rates without directly complexly interacting with all input signals simultaneously, thereby reducing circuit scale while maintaining synchronization reliability.
2Device complexity
If conventional multiplexing is used without frequency information retention, then circuit scale is reduced, but data loss occurs and data rate matching cannot be ensured
Solution Approach 1:
The patent extracts frequency information from the input data signals as a separate entity. The frequency information extraction unit isolates this critical parameter from the main data stream, allowing it to be processed and retained independently. This extraction prevents information loss while avoiding the need to complexly process the entire signal, thus maintaining a reasonable circuit scale.
Solution Approach 2:
The patent changes the approach from processing entire signals to processing specific parameters (frequency information). By focusing on this key parameter and using it to control data rate adjustment, the system retains essential information without requiring complex circuitry to handle all signal aspects, thereby balancing information retention with circuit simplicity.
3Loss of time
If data signals with different bit rates are multiplexed without data rate adjustment, then processing time is reduced, but data loss occurs and synchronization is lost
Solution Approach 1:
The patent performs preliminary extraction of frequency information from input signals before the main multiplexing operation. This preliminary action allows the system to pre-determine the appropriate data rate adjustments needed, enabling synchronized multiplexing without requiring complex real-time adjustments during data transmission, thus reducing processing time while maintaining synchronization reliability.
4Length of stationary object
If optical data signals are used for long distance transmission, then transmission distance is increased, but transmission rate must be reduced compared to electric data signals
Solution Approach 1:
The patent merges multiple electric data signals with different bit rates into a single optical data signal through the multiplexing system. By combining multiple lower-rate signals into one higher-rate optical signal, the system achieves both long transmission distance (inherent optical signal advantage) and high effective transmission rate (through multiplexing gain), resolving the trade-off between distance and rate.
Data Source
AI summary
Digital signals having respective pieces of frequency information different from each other are bundled, and transmitted at high speed. On receiving side, digital signals retaining the respective pieces of frequency information are recovered and separated. Transmitter apparatus divides pieces of transmission data that have the different pieces of frequency information and correspond to respective input channels into data blocks having a fixed length, as valid data, and subsequently multiplexes the data blocks corresponding to the respective input channels and outputs the multiplexed data to a transmission path. A receiver apparatus divides data string received into data flows and subsequently restores the transmission data, from the data blocks consecutive in each data flow and stores the restored data, and outputs transmission data corresponding to the respective data flows in synchronization with clocks generated for these data flows.