ChirpSignal

Chirp Swept-frequency sine generator.

Installation

Enter the REPL mode and add the module from the latest repository by :

]add https://github.com/sonosole/ChirpSignal.git

or from Julia's official registries by :

]add ChirpSignal

Two Public APIs

chirp(T, fs, fl, fh; method="linear", phase=0.0) -> Array{Float64,1}
chirp(T, fs, f::Function; phase=0.0) -> Array{Float64,1}

The first API is enough for most usages. Detials could be found via Julia's helping mode.

help?> chirp

Example

Examples' public code

using WAV
using ChirpSignal

fs = 16000.0; # sampling frequency
fl = 500.0;   # lower bound frequency
fh = 8000.0;  # upper bound frequency
T  = 5.0 ;    # total time of chirp signal

Linear chirp example

# f(t) = (fh-fl)/T * t + fl
wav = chirp(T, fs, fl, fh; method="linear");
wavwrite(wav, "./doc/chirpLinear.wav", Fs=fs, nbits=32)

Quadratic chirp example

# f(t) = k * t^2 + fl, k = (fh-fl)/T^2
wav = chirp(T, fs, fl, fh; method="quadratic");
wavwrite(wav, "./doc/chirpQuadratic.wav", Fs=fs, nbits=32)

Logarithmic chirp example

# f(t) = k*log(t+1) + fl, k = (fh-fl)/log(T+1)
wav = chirp(T, fs, fl, fh; method="logarithmic");
wavwrite(wav, "./doc/chirpLogarithmic.wav", Fs=fs, nbits=32)

Exponential chirp example

# f(t) = exp(k * t) + (fl-1), k = 1/T*log(fh-fl+1)
wav = chirp(T, fs, fl, fh; method="exponential");
wavwrite(wav, "./doc/chirpExponential.wav", Fs=fs, nbits=32)

Customizable chirp example by user's own function

Customizable chirp by specifying fun(t) = 2000*t

fun(t) = 2000*t
wav = chirp(2.0, 16000.0, fun)
wavwrite(wav, "./doc/0_4000hz_linear.wav", Fs=fs, nbits=32)

Customizable chirp example by user's anonymous function

Customizable chirp by specifying a anonymous function t -> 2000*t^2

wav = chirp(2.0, 16000.0, t -> 2000*t^2 )
wavwrite(wav, "./doc/0_8000Hz_quadratic.wav", Fs=fs, nbits=32)

PS

For method="linear" and method="quadratic" cases, the lower bound frequency fl could be set lager than the upper bound frequency fh, but not for the method="logarithmic" and method="exponential".

sonosole / chirpsignal Goto Github PK

chirpsignal's Introduction

ChirpSignal

Installation

Two Public APIs

Example

Examples' public code

Linear chirp example

Quadratic chirp example

Logarithmic chirp example

Exponential chirp example

Customizable chirp example by user's own function

Customizable chirp example by user's anonymous function

PS

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