Directional DC Signal Coding for Simpler Two-Wire Transmission
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Solution Overview
Problem
Conventional digital audio signal coding and decoding methods require complex coding methods and circuits, leading to higher costs for circuits and system configuration.
Innovation Solution
A digital signal coding and decoding method that utilizes a direct current signal combined with first and second direction indication signals, which are in opposite directions, to generate coded signals for transmission, and employs a simple circuit configuration for decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional digital audio signal coding and decoding methods are used, then digital signal transmission can be achieved, but circuit complexity and manufacturing costs increase
Solution Approach 1:
The patent changes the parameter representation method by encoding digital signals as direction indication signals superimposed on a DC current carrier. Instead of using complex digital coding schemes, the invention maps binary data to directional pulses (positive/negative directions) that modulate the DC current, thereby simplifying the circuit while maintaining transmission reliability
Solution Approach 2:
The patent replaces complex electronic digital signal processing circuits with a simpler current-based directional signaling system. By substituting digital voltage levels with directional current pulses on a DC carrier, the invention eliminates the need for complex analog-to-digital and digital-to-analog converters, reducing overall circuit complexity
2Reliability
If conventional digital audio signal coding and decoding methods are used, then digital signal transmission can be achieved, but manufacturing costs increase
Solution Approach 1:
The invention changes the signal parameter from voltage-based digital levels to current-based directional pulses on a DC carrier. This parameter transformation enables the use of simpler, lower-cost components such as current sources and directional switches instead of expensive high-precision digital signal processing circuits, thereby reducing manufacturing costs while maintaining transmission reliability
Solution Approach 2:
The patent employs simple, inexpensive components for signal encoding and decoding, such as basic current sources, directional switches, and pulse generators, replacing costly digital signal processing hardware. The simplicity of the circuit design allows for easier manufacturing and lower component costs
Data Source
AI summary
A digital signal coding and decoding method, a digital broadcasting system, and a digital telephone exchange system are provided. The digital signal coding and decoding method includes providing a direct current signal; and providing a first direction indication signal and a second direction indication signal on the direct current signal according to each digital signal, so as to generate a plurality of coded signals. The digital signals include a plurality of low level digital signals and a plurality of high level digital signals. The first direction indication signal and the second direction indication signal are signals in opposite directions.