How to Build a Circuit to Detect Analog or Digital Audio Input and Light Up an LED

The discussion centers on designing a circuit capable of detecting whether an audio input signal is analog or digital and indicating the result via an LED. It is suggested that differentiation could be achieved if the digital signal is DC coupled and the analog signal is AC coupled, allowing the circuit to distinguish between the two based on coupling characteristics. The audio source in question is from an XLR patch panel, where analog signals produce audible sound through headphones, while digital signals do not. The goal is to create a board-mounted LED indicator to signal the presence of analog or digital audio without requiring headphone monitoring. No concrete circuit design or schematic was provided, and attempts to link to unrelated circuits (e.g., a clap switch) were deemed unhelpful. The original poster and others expressed dissatisfaction with the lack of a definitive solution.
Summary generated by the language model.