|
|
|
@ -34,37 +34,37 @@ def monitor_pitch(device: int = 5,
|
|
|
|
|
pass
|
|
|
|
|
supported_sample_rates = numpy.array(supported_sample_rates)
|
|
|
|
|
logger.info('Supported rates: {}'.format(supported_sample_rates))
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
'''
|
|
|
|
|
max_freq < 2 * sample_rate
|
|
|
|
|
min_freq * 2**(1/12) > freq_resolution (for discrimination), more for accuracy...
|
|
|
|
|
freq_resolution <= sample_rate / (samples_per_buffer * num_buffers)
|
|
|
|
|
'''
|
|
|
|
|
freq_resolution = min_freq * 2**(1/12) / 10
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
rate_is_acceptable = supported_sample_rates >= 2 * max_freq
|
|
|
|
|
sample_rate = int(numpy.min(supported_sample_rates[rate_is_acceptable]))
|
|
|
|
|
num_buffers = int(numpy.ceil(sample_rate / (samples_per_buffer * freq_resolution)))
|
|
|
|
|
samples_per_fft = samples_per_buffer * num_buffers
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
logger.info('Running on device {} with {} buffers,'.format(device, num_buffers) +
|
|
|
|
|
' {} sample rate, {} samples per buffer'.format(
|
|
|
|
|
device, num_buffers, sample_rate, samples_per_buffer))
|
|
|
|
|
logger.info('Buffers take {:.3g} sec to fully clear'.format(samples_per_fft / sample_rate))
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
stream = audio.open(format=pyaudio.paInt16,
|
|
|
|
|
channels=1,
|
|
|
|
|
rate=sample_rate,
|
|
|
|
|
input=True,
|
|
|
|
|
frames_per_buffer=samples_per_buffer)
|
|
|
|
|
stream.start_stream()
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
# Hanning window
|
|
|
|
|
window = (1 - numpy.cos(numpy.linspace(0, 2 * pi, samples_per_fft, False))) / 2
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
freqs = numpy.fft.fftfreq(samples_per_fft, 1 / sample_rate)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
buf = numpy.zeros(num_buffers * samples_per_buffer, dtype=numpy.float32)
|
|
|
|
|
note_names = ['C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A', 'A#', 'B']
|
|
|
|
|
|
|
|
|
@ -72,25 +72,25 @@ def monitor_pitch(device: int = 5,
|
|
|
|
|
# Shift the buffer down and new data in
|
|
|
|
|
buf[:-samples_per_buffer] = buf[samples_per_buffer:]
|
|
|
|
|
buf[-samples_per_buffer:] = numpy.fromstring(stream.read(samples_per_buffer), numpy.int16)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
fft = numpy.fft.rfft(buf * window)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
# Get frequency of maximum response in range
|
|
|
|
|
ind = numpy.abs(fft[1:]).argmax() + 1
|
|
|
|
|
freq = freqs[ind]
|
|
|
|
|
mag = numpy.abs(fft[ind])
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
# Get note number and nearest note
|
|
|
|
|
q = numpy.log2(freq/440)
|
|
|
|
|
n = 12 * q + 69
|
|
|
|
|
n0 = int(round(n))
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
delta = n - n0
|
|
|
|
|
logger.info('freq: {:7.2f} Hz mag:{:7.2f} note: {:>3s} {:+.2f}'.format(
|
|
|
|
|
freq, numpy.log10(mag), note_names[n0 % 12] + str(n0//12 - 1), delta))
|
|
|
|
|
|
|
|
|
|
delta_part = int(delta // 0.1)
|
|
|
|
|
if delta_part > 0:
|
|
|
|
|
if delta_part > 0:
|
|
|
|
|
signal = ' ' * 6 + '+' * delta_part
|
|
|
|
|
elif delta_part == 0:
|
|
|
|
|
signal = ' ' * 5 + '|'
|
|
|
|
@ -98,7 +98,7 @@ def monitor_pitch(device: int = 5,
|
|
|
|
|
signal = ' ' * (5 + delta_part) + '-' * delta_part
|
|
|
|
|
logger.info(' {}'.format(signal))
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
if __name__ == '__main__':
|
|
|
|
|
audio = pyaudio.PyAudio()
|
|
|
|
|
logger.info("Available devices:")
|
|
|
|
|