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-rwxr-xr-xfw/hid-dials/tools/hum_generator.py111
1 files changed, 0 insertions, 111 deletions
diff --git a/fw/hid-dials/tools/hum_generator.py b/fw/hid-dials/tools/hum_generator.py
deleted file mode 100755
index fbcabac..0000000
--- a/fw/hid-dials/tools/hum_generator.py
+++ /dev/null
@@ -1,111 +0,0 @@
-#!/usr/bin/env python
-# coding: utf-8
-
-import binascii
-import struct
-
-import numpy as np
-import pydub
-
-from dsss_demod_test_waveform_gen import load_noise_gen, modulate as dsss_modulate
-
-np.set_printoptions(linewidth=240)
-
-def generate_noisy_signal(
- test_data=32,
- test_nbits=5,
- test_decimation=10,
- test_signal_amplitude=20e-3,
- noise_level=10e-3,
- noise_spec='synth://grid_freq_psd_spl_108pt.json',
- seed=0):
-
- #test_data = np.random.RandomState(seed=0).randint(0, 2 * (2**test_nbits), test_duration)
- #test_data = np.array([0, 1, 2, 3] * 50)
- if isinstance(test_data, int):
- test_data = np.array(range(test_data))
-
-
- signal = np.repeat(dsss_modulate(test_data, test_nbits) * 2.0 - 1, test_decimation)
-
- noise_gen, noise_params = load_noise_gen(noise_spec)
- noise = noise_gen(seed, len(signal), **noise_params)
- return np.absolute(noise + signal*test_signal_amplitude)
-
-def write_raw_frequencies_bin(outfile, **kwargs):
- with open(outfile, 'wb') as f:
- for x in generate_noisy_signal(**kwargs):
- f.write(struct.pack('f', x))
-
-def synthesize_sine(freqs, freqs_sampling_rate=10.0, output_sampling_rate=44100):
- duration = len(freqs) / freqs_sampling_rate # seconds
- afreq_out = np.interp(np.linspace(0, duration, int(duration*output_sampling_rate)), np.linspace(0, duration, len(freqs)), freqs)
- return np.sin(np.cumsum(2*np.pi * afreq_out / output_sampling_rate))
-
-def write_flac(filename, signal, sampling_rate=44100):
- signal -= np.min(signal)
- signal /= np.max(signal)
- signal -= 0.5
- signal *= 2**16 - 1
- le_bytes = signal.astype(np.int16).tobytes()
- seg = pydub.AudioSegment(data=le_bytes, sample_width=2, frame_rate=sampling_rate, channels=1)
- seg.export(filename, format='flac')
-
-def write_synthetic_hum_flac(filename, output_sampling_rate=44100, freqs_sampling_rate=10.0, **kwargs):
- signal = generate_noisy_signal(**kwargs)
- print(signal)
- write_flac(filename, synthesize_sine(signal, freqs_sampling_rate, output_sampling_rate),
- sampling_rate=output_sampling_rate)
-
-def emulate_adc_signal(adc_bits=12, adc_offset=0.4, adc_amplitude=0.25, freq_sampling_rate=10.0, output_sampling_rate=1000, **kwargs):
- signal = synthesize_sine(generate_noisy_signal(), freq_sampling_rate, output_sampling_rate)
- signal = signal*adc_amplitude + adc_offset
- smin, smax = np.min(signal), np.max(signal)
- if smin < 0.0 or smax > 1.0:
- raise UserWarning('Amplitude or offset too large: Signal out of bounds with min/max [{smin}, {smax}] of ADC range')
- signal *= 2**adc_bits -1
- return signal
-
-def save_adc_signal(fn, signal, dtype=np.uint16):
- with open(fn, 'wb') as f:
- f.write(signal.astype(dtype).tobytes())
-
-def write_emulated_adc_signal_bin(filename, **kwargs):
- save_adc_signal(filename, emulate_adc_signal(**kwargs))
-
-def hum_cmd(args):
- write_synthetic_hum_flac(args.out_flac,
- output_sampling_rate=args.audio_sampling_rate,
- freqs_sampling_rate=args.frequency_sampling_rate,
- test_data = np.array(list(binascii.unhexlify(args.data))),
- test_nbits = args.symbol_bits,
- test_decimation = args.decimation,
- test_signal_amplitude = args.signal_level/1e3,
- noise_level = args.noise_level/1e3,
- noise_spec=args.noise_spec,
- seed = args.random_seed)
-
-
-if __name__ == '__main__':
- import argparse
- parser = argparse.ArgumentParser()
- cmd_parser = parser.add_subparsers(required=True)
- hum_parser = cmd_parser.add_parser('hum', help='Generated artificial modulated mains hum')
- # output parameters
- hum_parser.add_argument('-a', '--audio-sampling-rate', type=int, default=44100)
-
- # modulation parameters
- hum_parser.add_argument('-f', '--frequency-sampling-rate', type=float, default=10.0*100/128)
- hum_parser.add_argument('-b', '--symbol-bits', type=int, default=5, help='bits per symbol (excluding sign bit)')
- hum_parser.add_argument('-n', '--noise-level', type=float, default=1.0, help='Scale synthetic noise level')
- hum_parser.add_argument('-s', '--signal-level', type=float, default=20.0, help='Synthetic noise level in mHz')
- hum_parser.add_argument('-d', '--decimation', type=int, default=10, help='DSSS modulation decimation in frequency measurement cycles')
- hum_parser.add_argument('-r', '--random-seed', type=int, default=0)
- hum_parser.add_argument('--noise-spec', type=str, default='synth://grid_freq_psd_spl_108pt.json')
- hum_parser.add_argument('out_flac', metavar='out.flac', help='FLAC output file')
- hum_parser.add_argument('data', help='modulation data hex string')
- hum_parser.set_defaults(func=hum_cmd)
-
- args = parser.parse_args()
- args.func(args)
-