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A millisecond (from milli- and second; symbol: ms) is a unit of time in the International System of Units equal to one thousandth (0.001 or 10−3 or 1/1000) of a second and to 1000 microseconds. A unit of 10 milliseconds may be called a centisecond, and one of 100 milliseconds a decisecond, but these names are rarely used. To help compare orders of magnitude of different times, this page lists times between 10−3 seconds and 100 seconds (1 millisecond and one second). See also times of other orders of magnitude. The Apollo Guidance Computer used metric units internally, with centiseconds used for time calculation and measurement. 1 millisecond (1 ms) – cycle time for frequency 1 kHz; duration of light for typical photo flash strobe; time taken for sound wave to travel about 34 cm; repetition interval of GPS C/A PN code 1 millisecond - time taken for light to travel 204.19 km in a single mode fiber optic cable for a wavelength of 1550nm (frequency: 193 THz). 1.000692286 milliseconds – time taken for light to travel 300 km in a vacuum 1 to 5 milliseconds – typical response time in LCD computer monitors, especially high-end displays 2 milliseconds – Shift time for a modern Formula One car using a seamless-shift semi-automatic sequential transmission 2.27 milliseconds – cycle time for pitch A440, the most commonly used pitch for tuning musical instruments 3 milliseconds – a housefly's wing flap. Also the normative speed of sound (an issue in track and field) 3.3 milliseconds – normal delay time between initiation and detonation of a C4 explosive charge 4 milliseconds – typical average seek time for a 10,000 rpm hard disk 5 milliseconds – a honey bee's wing flap 5 milliseconds to 80 milliseconds – a hummingbird's wing flap 8 milliseconds – 1/125 of a second, a standard camera shutter speed (125); fastest shifting time of a car's mechanical transmission 10 milliseconds (10 ms) – a jiffy, cycle time for frequency 100 Hz 10.378 milliseconds – rotation period of pulsar B1639+36A 15.625 milliseconds – a two hundred fifty-sixth note at 60 BPM 16.
[2]Paolo Prandoni, [3]LCAV, EPFL
In this notebook we will explore various ways to implement a system
that changes the voice of a speaker. Typical applications for these
techniques, strictly sorted by plausibility, include international spy
missions and prank telephone calls, and devices such as the one
displayed here can be easily bought on the web... or in a novelty shop.
No description has been provided for t [2]Paolo Prandoni, [3]LCAV, EPFL
In this notebook we will look at the practical issues associated to
plotting the DFT and in particular the DFT of real-world signals. We
will examine how to map the DFT coefficients to real-world frequencies
and we will investigate the frequency resolution of the DFT and the
effects of zero padding.
In [1]:
[2]Paolo Prandoni, [3]LCAV, EPFL
In this notebook we will design and use filters to extract specific
audio frequencies from a music file.
In [1]:
%matplotlib inline
import matplotlib.pyplot as plt
import numpy as np
import IPython
import scipy.signal as sp
from scipy.io import wavfile
infringment...)
In [2]:
IPython.display.Audio(s, rate=SF)
Out[2]:
Your browser does not support the audio element.