## Diagram: Multi-Stage Signal Processing System ### Overview The image depicts a multi-stage technical system combining directional input processing, electronic circuitry, and data visualization. It includes: - A grid-based input matrix (a) - A signal conditioning circuit (b) - Experimental hardware (c) - Conductance distribution functions (d) - Time-voltage response traces (e) - Input-output heatmap (f) ### Components/Axes #### a. Directional Input Grid - Labels: `<N>`, `<W>`, `<S>`, `<E>` (cardinal directions) - Structure: 2x4 grid of green squares with blue boundary highlighting active regions #### b. Signal Conditioning Circuit - Components: - Voltage sources: `V_in`, `V_top`, `V_bot` - Gain stages: `G1`, `G2` - Buffer: `V_buff` - Output: `V_out` - Flow: Input signals pass through gain stages, buffered, and outputted #### c. Experimental Setup - Microscope with attached electronics - Wiring harness connecting to signal processing unit #### d. Conductance Distribution Function (CDF) - Axes: - x-axis: Conductance (μS) from 0 to 125 - y-axis: CDF (0 to 1) - Threshold line: Vertical red line at ~75 μS - Regions: - LCS (Low Conductance State): Left of threshold - HCS (High Conductance State): Right of threshold #### e. Time-Voltage Response - Axes: - x-axis: Time (μs) from 0 to 6 - y-axis: Voltage (V) from -4 to 1.2 - Traces: - `V_in` (blue): Sharp spikes at 1.5μs, 3.5μs, 5.5μs - `V_N` (dashed blue): Stable at ~0.2V - `V_S` (orange): Peaks at 2.5μs, 4.5μs - `V_E` (red): Peaks at 1.5μs, 3.5μs, 5.5μs #### f. Input-Output Heatmap - Axes: - x-axis: Inputs (0-3) - y-axis: Outputs (0-1) - Color coding: - Green: Active (1) - White: Inactive (0) - Pattern: Diagonal green blocks suggesting input-output correlation ### Detailed Analysis 1. **Directional Input Processing (a)**: - Grid structure suggests spatial encoding of directional stimuli - Blue boundary highlights active quadrants (likely N/S or W/E pairs) 2. **Circuit Functionality (b)**: - Gain stages (`G1`, `G2`) amplify input signals - Buffer stage isolates output from load variations - Voltage references (`V_top`, `V_bot`) define operational range 3. **Experimental Validation (c)**: - Microscope setup implies optical input to the system - Wiring complexity suggests multi-channel data acquisition 4. **Conductance Thresholding (d)**: - LCS/HCS demarcation at ~75 μS - CDF curve shows 80% of samples below threshold 5. **Dynamic Response (e)**: - `V_in` exhibits periodic spiking matching input stimuli - `V_E` (red) shows strongest correlation with input timing - All traces stabilize after 6μs 6. **Input-Output Mapping (f)**: - 4x2 matrix shows deterministic relationships - Output 1 activates for inputs 0-2 - Output 0 activates for input 3 ### Key Observations - **Temporal Synchronization**: Voltage spikes in (e) align with input activation times - **Threshold Sensitivity**: 75 μS cutoff separates LCS/HCS with 80% CDF coverage - **Circuit Gain**: `V_out` amplitude (~1.2V) exceeds input range (~0.4V) - **Heatmap Symmetry**: Diagonal pattern suggests input-output parity ### Interpretation This system implements a directional sensing mechanism where: 1. Spatial inputs (`<N>`, `<W>`, etc.) are converted to electrical signals 2. Gain stages amplify signals to overcome noise 3. Conductance thresholding enables binary state classification (LCS/HCS) 4. Time-varying voltage responses validate input-output timing relationships 5. Heatmap confirms input-output mapping rules The LCS/HCS threshold at 75 μS likely represents a critical conductance level for state transition. The 80% CDF below threshold suggests the system spends most time in LCS, with HCS reserved for high-confidence inputs. The voltage response traces demonstrate the system's ability to track rapid input changes (spike timing precision <1μs). The heatmap's diagonal pattern indicates a 1:1 input-output relationship for most cases, with input 3 acting as a special case (always 0 output). The experimental setup (c) suggests this is a proof-of-concept for neuromorphic computing or tactile sensing systems, where directional inputs trigger state changes monitored through conductance measurements. The buffer stage (b) ensures signal integrity during high-gain amplification, critical for maintaining response fidelity in noisy environments.