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Questions tagged [attenuation]

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2 votes
2 answers
725 views

Is it possible to design a wearable device with a noise reduction ratio (NRR) larger than 36 dB?

Wearing both ear muffs (whether passive or active) and earplugs simultaneously can't yield more than 36 dB noise reduction ratio (NRR), because: it does not prevent the sound to reach your inner ear ...
Franck Dernoncourt's user avatar
0 votes
1 answer
27 views

Signal attenuation and time delay

I want to investigate the attenuation in signal due to various environmental factors such as rain. Is it sensible to try to investigate some function that relates the time delay due to those ...
user7341333's user avatar
0 votes
1 answer
37 views

Calculating stopband cut-off frequency and stopband attenuation for FIR lowpass window filter

I am aiming to create a digital windowing FIR filter on MATLAB and have been given specs such as a: sampling frequency of 360Hz maximum filter order of 5 cut-off frequency of 98Hz/ 1.710rad/sample (...
EEE22's user avatar
  • 1
0 votes
1 answer
65 views

What types of sound attenuation do exist?

Sound attenuation can occur due to various phenomena. The most known are Distance: For a point source the sound pressure decreases by 6dB with each doubling of the distance to the sound source. ...
MrRabbit's user avatar
1 vote
2 answers
97 views

Matlab IIR stopband filter attenuates my sinusoid input with frequency in the passband

I'm a DSP newbie trying to get into the field. Despite being able to use some of the MATLAB tools, I'm still not completely solid on some intuition of the frequency domain. I've implemented a biquad ...
Chris H.'s user avatar
4 votes
1 answer
174 views

Estimation of the attenuation of two waves on a linear sensor array

Context and objective I am trying to estimate the attenuation coefficients ($\alpha_u$ and $\alpha_v$) of two waves ($\overrightarrow{u}$ and $\overrightarrow{v}$). These waves propagate on a linear ...
User327201's user avatar
0 votes
1 answer
157 views

High pass filter not attenuating signal at start of input

I have implemented digital high pass filter with below specs: Sampling frequency = 5333 Hz Cutoff frequency = 10 Hz Order = 3 We are facing problem like below: As ...
Ankit Chudasama's user avatar
3 votes
1 answer
169 views

Given a wide band signal with equal SNR over the whole spectrum, what should the stop band attenuation be for a decimation filter?

Imagine an incoming signal with $60$ dB SNR over the whole spectrum. I want to decimate this signal by a factor of, say, $40$, while maintaining a $60$ dB SNR in the remaining frequency range. What ...
Tom Verbeure's user avatar
0 votes
1 answer
307 views

Adding attenuations in dB

I am writing a synthesizer. One part of the synthesizer specification says that different sources can specify an attenuation to be applied to a signal, and that these attenuations should be summed. ...
user19642323's user avatar
4 votes
1 answer
201 views

Is there a recommended amount of attenuation for rectifying edge artefacts?

I just noticed that Spotify fades in/out the music when you play/pause - is this to avoid clicking? This attenuation is noticeable; is there a minimum amount of attenuation required to fix clicking (...
Tobi Akinyemi's user avatar
-1 votes
1 answer
148 views

Determine reflections from received signal

I have a reference signal $r(t)$ and the correlation between that reference signal and the received signal : $C_{XR}(\tau)$. The signal I receive contains reflections on walls. I have to build a ...
Jon's user avatar
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0 votes
1 answer
32 views

Small Scale Fading time varying or position varying

I would like to ask how small scale fading can affect a transmission with time. The particular system is an antenna transmitting an ASK modulated signal at 915MHz and with bandwidth between 200KHz to ...
user1993416's user avatar
0 votes
1 answer
95 views

Compensate for microphone?

I have trained a machine learning model to recognize a specific audio event from mel spectrograms, and it works pretty well on a hold-out test dataset. I now want to run the model on a device and feed ...
termachine's user avatar
1 vote
1 answer
269 views

High order IIR Comb Notch Filter with small Bandwidth - Low atenuation of harmonics

Im filtering an EMG signal, more precisely the 50 Hz frequency and its harmonics. For that, I've constructed a comb notch filter (on filterdesigner in Matlab), with its fundamental frequency being 50 ...
Mariana Mourão's user avatar
0 votes
0 answers
629 views

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 ...
almost_linear's user avatar
2 votes
1 answer
580 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 ...
dsp_yes's user avatar
  • 63
2 votes
1 answer
214 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 ...
S Fateri's user avatar
  • 316
1 vote
0 answers
342 views

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 ...
BBales's user avatar
  • 111
0 votes
1 answer
221 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 ...
Television's user avatar
0 votes
1 answer
155 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 \...
mavavilj's user avatar
  • 1,414
5 votes
2 answers
3k views

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 ...
Paul's user avatar
  • 351
6 votes
1 answer
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 ...