Signals & Analysis - week 1+2
- Created by: harveyf2801
- Created on: 22-01-21 13:29
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- Signals & Analysis
- A decibel is the just noticeable difference in signal levels
- A decibel is 1/10 of a bell
- dB = 10 x log(p1/p2)
- dB = 10 x log(vp1^2/vp2^2)
- dB = 20 x log(vRMS1/RMSvP2) = SNR
- dB = 20 x log(vp1/vp2) = dynamic range
- Phase delay
- phase = tdelay/tcycle * 360 degrees
- tdelay = the delay time of two waves at the same point in amplitude (usually measured at the zero crossing point)
- Destructive wave interference is where waves that are out of phase combine to give a negative, cancelled effect
- Constructive wave interference is where waves that are in phase combine to give a positive, boosted effect
- Phase delay can only be calculated if both waves are the same frequency
- phase = tdelay/tcycle * 2PI radians
- tcycle = 1 full oscillation of wave A
- phase = tdelay/tcycle * 360 degrees
- Analogue or digital
- Physical/Psychophysical representations of sound
- Human hearing range is 20Hz - 20kHz
- Physical/Psychophysical representations of sound
- Wave properties
- RMS is Root Mean Square Amplitude
- RMS = peak value / root(2)
- RMS = peak-peak x 0.354 or peak x 0.707
- 1 period or cycle is from peak to peak
- Peak is from 0 to the max amplitude
- Peak-peak is from min amplitude to max
- RMS is Root Mean Square Amplitude
- A decibel is the just noticeable difference in signal levels
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