chirp | R Documentation |

Generate a chirp signal. A chirp signal is a frequency swept cosine wave.

```
chirp(t, f0 = 0, t1 = 1, f1 = 100,
form = c("linear", "quadratic", "logarithmic"), phase = 0)
```

`t` |
array of times at which to evaluate the chirp signal. |

`f0` |
frequency at time t=0. |

`t1` |
time, s. |

`f1` |
frequency at time t=t1. |

`form` |
shape of frequency sweep, one of |

`phase` |
phase shift at t=0. |

`'linear'`

is:

`f(t) = (f1-f0)*(t/t1) + f0`

`'quadratic'`

is:

`f(t) = (f1-f0)*(t/t1)^2 + f0`

`'logarithmic'`

is:

`f(t) = (f1-f0)^{t/t1} + f0`

Chirp signal, an array the same length as `t`

.

Original Octave version by Paul Kienzle. Conversion to R by Tom Short.

Octave Forge https://octave.sourceforge.io/

`specgram`

```
ch <- chirp(seq(0, 0.6, len=5000))
plot(ch, type = "l")
# Shows a quadratic chirp of 400 Hz at t=0 and 100 Hz at t=10
# Time goes from -2 to 15 seconds.
specgram(chirp(seq(-2, 15, by=0.001), 400, 10, 100, "quadratic"))
# Shows a logarithmic chirp of 200 Hz at t=0 and 500 Hz at t=2
# Time goes from 0 to 5 seconds at 8000 Hz.
specgram(chirp(seq(0, 5, by=1/8000), 200, 2, 500, "logarithmic"))
```

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