Tone¶
Tone generates sound (a waveform) at a given frequency for a given
length of time in seconds. The output audio sample type is 32-bit float.
Use ConvertAudio if this is not what you want.
Syntax and Parameters¶
Tone (float "length", float "frequency", int "samplerate", int "channels", string "type", float "level")
- length
Length of time in seconds.
Default: 10.00
- frequency
Tone frequency.
Default: 440
- samplerate
Audio sample rate.
Default: 48000
- channels
Number of audio channels.
Default: 2
- type
"Silence", "Sine", "Noise", "Square", "Triangle" or "Sawtooth".
Default: "Sine"
- level
- For a particular decibel level, use the equation
level= 10 dB / 20For example, create a -12dB tone withlevel= 10-12/20 or 0.251.Default: 1.0
Discussion¶
Tone(frequency=2, samplerate=48000, channels=2, type="sine", level=0.4)
In the figure above, a sinus is generated (on a black clip with framerate 24 fps). The period of the waveform (in frames) is the framerate divided by frequency (or fps/freq, which is 24/2=12 frames in our example). The part of the graph which is light-green represents all samples of the frame under consideration (which is frame 1 here). The number of samples in a particular frame is given by the samplerate divided by the framerate (which is 48000/24 = 2000 samples in our example).
More generally, the waveform above is described by
g(n,s) = level * sin(2*pi*(frequency*n/framerate + s*frequency/samplerate))
with n the frame and s the sample under consideration (note that s runs from 0 to samplerate/framerate - 1).
In the example above, this reduces to
g(n,s) = 0.4 * sin(2*pi*(2*n/24 + s*2/48000))
with n the frame and s the sample under consideration (note that s runs from 0 to 1999).
Note that the bars are made with Histogram and the graph with the AudioGraph plugin.
Examples¶
We Wish You a Merry Christmas, in harmony (author hanzfrunz)
Changelog¶
Version |
Changes |
|---|---|
AviSynth 2.5.6 |
Added |
AviSynth 2.5.4 |
Initial release. |
$Date: 2022/03/04 00:53:01 $
