## windowing.png

The image is a graph that illustrates a signal with a Hann window applied to it. The title of the graph reads: "Signal with a Hann window looks as if it would be continuous." This suggests that the Hann window has been used to smooth out the signal, making it appear more continuous than it might otherwise.

### Key Elements in the Graph:

1. **Axes**:
   - The horizontal axis is labeled "Time (ms)" and ranges from approximately -10 ms to 40 ms.
   - The vertical axis is labeled "Amplitude" and ranges from -1.0 to +1.0.

2. **Curves in the Graph**:
   - There are two curves plotted on the graph: 
     - A solid blue line represents the "Windowed signal."
     - An orange dashed line represents the "Window function."

3. **The Window Function (Orange Dashed Line)**:
   - The window function is a smooth, bell-shaped curve that starts at 0 and reaches its maximum value of approximately +1 around the time mark of 15 ms.
   - It then gradually decreases back to 0 as it approaches the end of the graph.

4. **The Windowed Signal (Blue Solid Line)**:
   - The windowed signal is a jagged line that fluctuates up and down, reflecting the original signal's characteristics before being smoothed by the Hann window.
   - The amplitude of this signal varies significantly over time but is influenced by the Hann window function.

5. **Legend**:
   - A legend in the lower right corner identifies the two curves: "Windowed signal" (blue solid line) and "Window function" (orange dashed line).

6. **Source Information**:
   - The source of this graph is cited at the bottom left as "https://speechprocessingbook.aalto.fi."

### Description for a Blind Student:

The image shows a graph with two lines: one blue and one orange. The blue line represents how a signal looks after being smoothed by something called a Hann window, while the orange dashed line shows what this smoothing process (the Hann window) would look like on its own.

- The horizontal axis is labeled "Time" in milliseconds (ms), ranging from -10 ms to 40 ms.
- The vertical axis is labeled "Amplitude," which measures how high or low a signal goes, and it ranges from -1.0 to +1.0.

The blue line, representing the windowed signal, shows many peaks and troughs, indicating that this part of the graph represents the original signal before being smoothed out by the Hann window.
- The orange dashed line is smoother and forms a bell shape, peaking at around 15 ms with an amplitude close to +1. This line represents how the Hann window would look if applied alone.

The source of this information can be found on a website called "speechprocessingbook.aalto.fi."

This description was generated automatically from image files by a local LLM, and thus, may not be fully accurate. Please feel free to ask questions if you have further questions about the nature of the image or its meaning within the presentation.