Discrete Cosine Transform
Models a sequence as a sum of cosine components and acts as a real-value approximation to the DFT.
\[ c_n = \sqrt{\frac{2}{P}} \sum_^{P}{m_i \cos{[\frac{n(i - \frac{1}{2})\pi}{P}]}} \]
Where \( P \) is the number of filterbank channels.
| C | Description |
|---|---|
| \(c_0\) | is a measure of the signal energy across all frequencies |
| \(c_1\) | is a measure of the ratio between high and low frequencies |
| \(c_2\) | is the ratio between high/low and mid frequencies |
etc.