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_pitch(self, pitch):
'''Set the goal pitch that the sinewave will gradually shift towards.'''
self.goal_frequency = utilities.pitch_to_frequency(pitch)
def test_pitch_to_frequency():
# 0 is middle C
assert utilities.pitch_to_frequency(0) == utilities.MIDDLE_C_FREQUENCY
# 9 is middle A (440)
assert math.isclose(utilities.pitch_to_frequency(9), 440, rel_tol=0.1)