AGC DSP AGC DSP Professor A G Constantinides© Acoustic Echo Canceller.
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Transcript of AGC DSP AGC DSP Professor A G Constantinides© Acoustic Echo Canceller.
Professor A G
Constantinides©
AGC
DSP
AGC
DSP
Multi-phase Flows
A mixture of fluids in a pipe (eg in oil industry)
Water
Pipeline
Gas
Oil
Flow of Oil+Water+Gas+Others
Sensor 1 Sensor 2L
Professor A G
Constantinides©
AGC
DSP
AGC
DSP
Multi-phase Flows Objective to estimate the Velocity of flow
Modelling: At sensor 1 At sensor 2
Where is the noise at that sensor uncorrelated with the signal
TL
Vˆ
)()()( 11 twtstx )()()( 22 twTtstx
2,1)( itwi
Professor A G
Constantinides©
AGC
DSP
AGC
DSP
Adaptive Noise Canceller
To cancel broadband noise
][nd
]}[{ nx][ne
w:Filter
Adaptive
Algorithm
delay
signal_+noise
Output: Sine
Professor A G
Constantinides©
AGC
DSP
AGC
DSP
Adaptive Line Enhancer
To find a low level sinusoid in noise
][nd][ˆ nd
]}[{ nx
][new:Filter
Adaptive
Algorithm
delay
sine_+noise
Weights: w
FFT
Output
Professor A G
Constantinides©
AGC
DSP
AGC
DSP
Beamformers, Conventional
The coherent summing of outputs of many spatially sensors is known as beamforming
They are essentially spatial filters Extensively used in
Seismology Underwater acoustics Biomedical engineering Industrial testing Telecommunications