def new_amplitude_array(self, time_array):
'''Calcululate the amplitude values for the next chunk of data.'''
dir = utilities.direction(self.amplitude, self.goal_amplitude)
new_amplitude = self.amplitude * utilities.decibels_to_amplitude_ratio(
dir * self.decibels_per_second * time_array)
return utilities.bounded_by_end(new_amplitude, self.amplitude,
self.goal_amplitude)
def __init__(self,
pitch,
pitch_per_second=12,
decibels=1,
decibels_per_second=1,
samplerate=utilities.DEFAULT_SAMPLE_RATE):
self.frequency = utilities.pitch_to_frequency(pitch)
self.phase = 0
self.amplitude = utilities.decibels_to_amplitude_ratio(decibels)
self.pitch_per_second = pitch_per_second
self.decibels_per_second = decibels_per_second
self.goal_frequency = self.frequency
self.goal_amplitude = self.amplitude
self.samplerate = samplerate
def set_decibels(self, decibels):
'''Set the amplitude (in decibels) that the sinewave will gradually shift towards.'''
self.goal_amplitude = utilities.decibels_to_amplitude_ratio(decibels)