Questions tagged [attenuation]
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I want to calculate two parameters related to Bone characterization namely BUA or Broadband ultrasound attenuation and Speed of Sound in MATLAB
I am using Simsonic software(http://www.simsonic.fr/) to generate 2 signals 1) for plane water(2D) width 45mm, and 2)for bone specimen 30mm width in the above vat. I am centering my source at 5mm and ...
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Differences between Matlab resample() and CMSIS decimate_f32()
I am pretty new to DSP and I need some help to pinpoint my mistake.
I am using Matlab to simulate an embedded environment. I have three signals all centered on 50Hz (6.4KHz sampling rate) which have ...
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1answer
275 views
When does a Window function's sidelobe level become out of band attenuation?
Another question I'm struggling to answer by myself.
For a Window function, say Blackman (response pictured), what is the out of band attenuation? If I'm designing a filter with out of band ...
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1answer
120 views
Changing the number of cycles of an sinusoidal input signal
Imagine we have an ultrasonic sensor that transmits a multiple cycles of sinusoidal signal/waveform that can travel up to a specific distance/range.
Can we achieve more distance coverage using more ...
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0answers
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I have 24-bit data in two's complement 32-bit integers. I need Q31 data
I have been trying to learn about Q31 format (as well as Q15), but I am having trouble understanding how it works.
So my CODEC is giving me 24-bit two's complement data. I have converted this data ...
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1answer
124 views
Variation of channel attenuation with frequency
Consider a standard RF channel over which signals are being transmitted over a 10 MHz bandwidth at 1800 MHz (using OFDM).
How does the channel's intrinsic attenuation vary over frequency?
More ...
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1answer
94 views
Insertion loss equality - proof
From this paper (slide 11), the insertion loss (or attenuation) is defined as
$$
L(\omega^2)=\frac{\lvert V_i(j\omega)\rvert^2}{\lvert V_o(j\omega)\rvert^2}=\frac{1}{\lvert H(j\omega)\rvert^2}=10 \...
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2answers
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Understanding the attenuation of a signal
I have been told that the signal in the graph below was obtained by passing a seismogram through a high-pass filter to obtain the high frequency-small amplitude waves common in tremors far from the ...
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1answer
1k views
Estimating attenuation using sliding windows
I am looking for an algorithm to measure attenuation of a discrete signal $s[t]$. Starting at the beginning of the signal sequence, is it possible to compute either sliding DFT or Gabor transform ...
