Pulse Density Signal Transmission with Static Fault Detection
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Solution Overview
Problem
Signal transmission devices for pulse density modulated signals lack a hierarchical data structure, making it difficult to transmit additional signals and implement signal integrity checks, such as CRC checks, due to the absence of a clear data structure.
Innovation Solution
The signal transmission device includes an amplitude limiter to set a defined maximum signal value, a locking device to introduce a static fault signal, and a signal change monitoring device to detect errors, ensuring no failure occurs during regular operation and allowing for targeted locking and error signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If pulse density modulated signals are transmitted without a hierarchical data structure, then the transmission path remains simple and quasi-analog, but signal integrity checks and additional binary signal transmission become impossible
Solution Approach 1:
The transmission signal is segmented into functional components: a dynamic pulse density modulated signal carrying the primary analog information, and a static fault signal component that serves as an error indication channel. This segmentation allows the single transmission path to convey both analog signal data and digital error status simultaneously, resolving the contradiction between simplicity and reliability.
Solution Approach 2:
The transmission path is designed with multi-functionality by enabling the pulse density modulated signal to serve dual purposes: conveying analog information through its dynamic characteristics while simultaneously serving as a carrier for error indication through its static state. This universal approach allows signal integrity checking without requiring separate dedicated error channels.
2Measurement precision
If the input signal range fully utilizes the modulation stage range, then signal resolution is maximized, but the system cannot distinguish between valid maximum signal and fault conditions
Solution Approach 1:
The system applies preliminary anti-action by pre-defining a reserved signal range that does not extend to the absolute maximum modulation capacity. This intentional under-utilization of the full signal range creates a protective buffer that prevents confusion between legitimate high-amplitude signals and fault conditions, allowing the locking device to reliably detect when the signal has been improperly locked to extreme values.
Solution Approach 2:
The system changes the operational parameter of signal range utilization by deliberately limiting the input signal to a defined maximum value that is lower than the full modulation stage capability. This parameter change creates a safety margin that enables reliable error detection while maintaining adequate signal resolution for normal operation.
3Reliability
If additional error detection components are added to the transmission device, then signal integrity checking becomes possible, but device complexity and cost increase
Solution Approach 1:
The transmission device performs self-service error detection by utilizing its own pulse density modulated signal as the basis for fault indication. The signal itself carries the error information through its static state, eliminating the need for separate external monitoring components. The locking device and signal change monitoring device work together to enable the system to self-diagnose transmission path faults without additional complexity.
Data Source
AI summary
A signal transmission device for pulse density modulated signals comprises a signal input for an input signal with a defined maximum signal value, a modulation stage for generating a pulse density modulated transmission signal out of the input signal, a locking device at the input for the pulse density modulated transmission signal to overwrite same with a static fault signal, a pulse reconstructing transmission path for the pulse density modulated transmission signal, a demodulation stage at the output, for reconstructing the input signal out of the transmitted pulse density modulated transmission signal, and a signal change monitoring device capturing the pulse density modulated transmission signal of the transmission path at the output, which has an error signal output for signaling the detection of a missing dynamic pulse density modulated transmission signal on the transmission path due to the static fault signal.