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# http://en.wikipedia.org/wiki/Spectral_centroid

from __future__ import division
from numpy import abs, sum, linspace
from numpy.fft import rfft

spectrum = abs(rfft(signal))
normalized_spectrum = spectrum / sum(spectrum)  # like a probability mass function
normalized_frequencies = linspace(0, 1, len(spectrum))
spectral_centroid = sum(normalized_frequencies * normalized_spectrum)

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"""
Measure the distance between two microphones based on the delay of a
clap from a point that is collinear with the two microphones.

Make sure your signal isn't clipping.

First test:
2 electrets 26 cm apart, hand clap
Distance:            -25.72 cm
Sub-sample distance: -26.02 cm

endolith

Comment availability in January 2004, Sato has been based on electricity.

● J-FET (measurement environment | Vds | = 10V)
Manufacturer, model number, voltage, V, current, A, Power, W, M, IDSS, Ciss, Crss, Yfs, Remarks
日電, (K68A), 50, V, -, A, 0.25, W, y, 0.5-12mA, 13p, 2.6p, 4.0-12 - mS, waste, low noise, high gm, difficulties in obtaining (Suzusho .)
日電, (J44/K163), 40, V, -, A, 0.4, W, y, 1.0-18mA, 50p/13p, 10p/3.2p, 7.0 ----- mS, waste, low noise, high gm, hard to obtain
日電, (K523), 50, V, -, A, 0.4, W, y, 1.0-18mA, 13p, 3.2p, 7.0 ----- mS, garbage, pin care DSG, low noise, high gm get difficult (Suzusho)
日電, (K533), 50, V, -, A, 0.4, W, y, 1.0-18mA, 13p, 3.2p, 7.0 ----- mS, K523 through the difficulty of obtaining for industrial (commercial bell)
Mitsubishi, J498/K2880, 50, V, -, A, 0.45, W, y, 0.6-12mA, 18p/8p, --/1.5p, 1.5-4.0-mS, J40/K381 hard to obtain
Toshiba, J109/K389, 30, V, -, A, 0.2, W, y, 2.6-20mA, 95p/25p, 25p/5.5p, 8.0-20 - mS, Dual

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arrows ← ↑ → ↓ ↔ ↵ ⇐ ⇑ ⇒ ⇓ ⇔

pipes | ¦

math ± ∞ ×

greek Αα Ββ Γγ Δδ Εε Ζζ Ηη Θθ Ιι Κκ Λλ Μμ Νν Ξξ Οο Ππ Ρρ ΣσςΤτ Υυ Φφ Χχ Ψψ Ωω

misc ♥ •

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#!/usr/bin/env python

"""
Event logger
The basic idea is just to provide an interface dedicated to manual data 
logging.  It will log the exact date and time that the user enters strings,
and allow it to be formatted for output in various ways.

Should be able to prompt the user to enter something at a given interval.

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"""
Bandlimited versions of scipy.signal.waveforms.

Intent is mathematical perfection over performance;
these use additive synthesis, so they are slow, but exact.

Less ideal methods using BLIT:
Sawtooth can be made by integrating BLIT minus a DC value to prevent integrator wandering off
Square can be made by integrating bipolar BLIT
Triangle can be made by integrating square

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;nyquist plug-in
;version 2
;type analyze
;name "Selection Duration..."
;action "Getting selection duration..."
;info "by David R. Sky, Steven Jones, Dominic Mazzoni\nReleased under terms of GNU Public License"

; Selection Duration by David R. Sky
; Code help from Steven jones, Dominic Mazzoni
; updated January 2, 2006

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;nyquist plug-in
;version 1
;type analyze
;name "Amplitude statistics..."
;action "Calculate amplitude statistics..."

; [email protected]
; 2010-08

; Set the output format (example: 53.3 dB)

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// ==UserScript==
// @name           Craiglist Live Filter
// @namespace      srawlins
// @description    Filter out listings with given words on Craigslist
// @include        http://*.craigslist.org/search/*
// ==/UserScript==

// v1.2

var clfDiv = document.createElement('div');

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;------------------------------------------------------------------------------
; Disable Insert key
;------------------------------------------------------------------------------
$Insert::return
!Insert::Send, {Insert} ; Use Alt+Insert to toggle the 'Insert mode'

;------------------------------------------------------------------------------
; Hand tool with middle button in Adobe Reader
;------------------------------------------------------------------------------
#IfWinActive ahk_class AdobeAcrobat