FormantTier

Praat FormantTier object: formant frequencies and bandwidths at discrete time points, with interpolation between points.

Arguments

tmin

Start time in seconds. Default 0.

tmax

End time in seconds. Default 1.

.xptr

Not for direct use. External pointer to the underlying C++ FormantTier object; set internally when a method returns a new FormantTier.

Value

A FormantTier object with methods for formant frequency and bandwidth manipulation via time-value points.

Details

The interpolated contour can be used to filter sounds for vowel modification or resynthesis.

Usage

FormantTier(tmin, tmax)              # create an empty FormantTier
FormantTier$from_formant(formant)    # convert from a Formant object

Query methods

• get_start_time(), get_end_time(), get_duration() - time range in seconds

• get_number_of_points() - number of time points

• get_min_num_formants(), get_max_num_formants() - formant count across points

• get_value_at_time(formant_number, time) - formant frequency in Hz

• get_bandwidth_at_time(formant_number, time) - bandwidth in Hz

Transformation

• filter_sound(sound, scale = TRUE) - filter a sound through the formants

• as_data_frame() - export to a data frame

• save(path) - save to file

Examples

# Create from Formant analysis
sound <- Sound$create_tone(frequency = 150, duration = 0.5)
formant <- sound$to_formant_burg()
ft <- FormantTier$from_formant(formant)

# Query formant values
f1 <- ft$get_value_at_time(1, 0.25)  # F1 at 0.25s
f2 <- ft$get_value_at_time(2, 0.25)  # F2 at 0.25s

# Filter a source sound
source <- Sound$create_tone(frequency = 100, duration = 0.5)  # Buzz
vowel <- ft$filter_sound(source)