From be7510dcc3f435f85aed95b9da2a303a63988391 Mon Sep 17 00:00:00 2001 From: not-matt <32398028+not-matt@users.noreply.github.com> Date: Mon, 18 Dec 2017 20:49:34 +0000 Subject: [PATCH] Delete dsp.py --- python/dsp.py | 53 --------------------------------------------------- 1 file changed, 53 deletions(-) delete mode 100644 python/dsp.py diff --git a/python/dsp.py b/python/dsp.py deleted file mode 100644 index 4dca617..0000000 --- a/python/dsp.py +++ /dev/null @@ -1,53 +0,0 @@ -from __future__ import print_function -import numpy as np -import config -import melbank - - -class ExpFilter: - """Simple exponential smoothing filter""" - def __init__(self, val=0.0, alpha_decay=0.5, alpha_rise=0.5): - """Small rise / decay factors = more smoothing""" - assert 0.0 < alpha_decay < 1.0, 'Invalid decay smoothing factor' - assert 0.0 < alpha_rise < 1.0, 'Invalid rise smoothing factor' - self.alpha_decay = alpha_decay - self.alpha_rise = alpha_rise - self.value = val - - def update(self, value): - if isinstance(self.value, (list, np.ndarray, tuple)): - alpha = value - self.value - alpha[alpha > 0.0] = self.alpha_rise - alpha[alpha <= 0.0] = self.alpha_decay - else: - alpha = self.alpha_rise if value > self.value else self.alpha_decay - self.value = alpha * value + (1.0 - alpha) * self.value - return self.value - - -def rfft(data, window=None): - window = 1.0 if window is None else window(len(data)) - ys = np.abs(np.fft.rfft(data * window)) - xs = np.fft.rfftfreq(len(data), 1.0 / config.MIC_RATE) - return xs, ys - - -def fft(data, window=None): - window = 1.0 if window is None else window(len(data)) - ys = np.fft.fft(data * window) - xs = np.fft.fftfreq(len(data), 1.0 / config.MIC_RATE) - return xs, ys - - -def create_mel_bank(): - global samples, mel_y, mel_x - samples = int(config.MIC_RATE * config.N_ROLLING_HISTORY / (2.0 * config.FPS)) - mel_y, (_, mel_x) = melbank.compute_melmat(num_mel_bands=config.N_FFT_BINS, - freq_min=config.MIN_FREQUENCY, - freq_max=config.MAX_FREQUENCY, - num_fft_bands=samples, - sample_rate=config.MIC_RATE) -samples = None -mel_y = None -mel_x = None -create_mel_bank() \ No newline at end of file