# Deriving notes from frequencies

### Description

Deriving notes from given (fundamental) frequencies.

### Usage

1 | ```
noteFromFF(x, diapason = 440, roundshift = 0)
``` |

### Arguments

`x` |
Fundamental frequency. |

`diapason` |
Frequency of diapason a, default is 440 (Hertz). |

`roundshift` |
Shift that indicates from here to round to the next integer (note).
The default (0) is “classical” rounding as described in Example: if |

### Details

The formula used is simply `round(12 * log(x / diapason, 2) + roundshift)`

.

### Value

An integer representing the (rounded) difference in halftones from diapason a,
i.e. indicating the note that corresponds to fundamental frequency `x`

given the value of `diapason`

.
For example: 0 indicates diapason a, 3: c', 12: a', ...

### Author(s)

Uwe Ligges ligges@statistik.tu-dortmund.de

### See Also

`FF`

, `periodogram`

, and tuneR for a very complete example.