# Questions tagged [signal-processing]

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### Weird beep when using audio interface

I’m experiencing this very weird beep which randomly (usually with a maximum interval of 5 minutes between occurrences) comes out when connecting my guitar to the PC through my M-AUDIO MTrack II Plus ...
• 101
38 views

### Mackie cr4-x studio monitors cutting audio when the input volume is too low

So I bought these used active studio monitors recently and use them with trs cables connected to my SSL2 audio interface. Everytime a track gets too quiet they cut the audio to a barely noticable ...
1 vote
54 views

### Curious about the math portion of subjects

I am a long time civil engineer. But I am interested in learning electrical electronics engineering and lately have been teaching myself about analog electronics, signals, digital electronics... One ...
• 472
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### Understanding Block Diagrams in Control Setups

Working on some automation for a Boeing 747 autopilot, I am trying to wrap my head around what sections of block diagrams like this one mean: I understand that something is being done to the yaw rate ...
56 views

### Spike in frequency domain in a dataset recorded using electromagnetic flow meter

I am trying to measure the water velocity of a stream along a channel using an electromagnetic flow meter at a specific location and depth. When I converted the data into frequency domain as power ...
• 31
43 views

### Calculating noise floor level and SNR

I have N samples of a baseband IQ signal that I took from an SDR (Pluto) with a certain fs (BW = fs). How can I accurately calculate the noise floor level of that signal in dBm, SNR in dB and Peak To ...
• 11
1 vote
127 views

### Converting time constant to bandwidth of 1st order system

When the system is first order: $1/(1+s\tau)$ Why is the bandwidth: $f_{-3db}=1/(2\pi \tau)$? Where did the $2\pi$ come from? Why isn't it simply $1/\tau$? The unit of $2\pi$ is related to radian. But ...
• 13
29 views

### Maximize SNR of RGB IR light-sensor for certain LED wavelength

I have a light-to-digital sensor (TCS34001) that measures intensity in four different bands (R, G, B, IR) and a red LED (ASMT-MR00-AHJ00) that I want to detect. Their spectra look like this: (ignore ...
31 views

### Two-Ray Ground-Reflection Model: Understanding the Difference in Phase Offsets at the Receiver

Currently, I'm trying to understand the Two-Ray Ground-Reflection Model. During my research, I came across the following simplification expressing the received power as follows (taken from Wikipedia): ...
155 views

### What is the intuitive explanation for why a system can be stable with a negative gain margin?

Beyond the math which shows that a gain of -1 and a phase of -180 (G(s)=-1)causes instability when the open-loop TF is taken to closed loop, the way I've always justified the instability of G(s)=-1 ...
• 133
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### Minimizing the MSE with symmetric scalar quantizers

Let $X$ be a scalar random variable with pdf $f(x)=e^{-2|x|}$. Among the class of symmetric 3 -point scalar quantizers find one which minimizes the MSE in quantizing $X$. Compute the MSE in this case. ...
1 vote
46 views

### How often is discrete-time control used in industry?

Although in reality I know that computers handle all systems in discrete time, in my limited industry work experience I've only used continuous-time control system analysis/standard frequency domain ...
• 133
56 views

### How to get the difference equation from second-order digital filter block diagram?

[![enter image description here][1]][1] Here I have a diagram and I am trying to create a difference equation for the filter. I've been using practice examples to try figure this one out however I am ...
101 views

### Troubleshooting clipping

I am collecting data for a project, where I am measuring the room impulse response by playing a sine sweep from a speaker (QSC K8 1KW Active Loudspeaker) and measuring it from the other side of the ...
91 views

### How simultaneous can we trigger multiple cameras' frame acquisition

Say we have ten cameras surrounding an object. The object changes its color with a certain frequency (or any information other than color, such as a text on it). The point is if all cameras are ...
• 103
27 views

### How to select a burst frequency of an Ultrasonic sensor?

I am using an Ultrasonic sensor to detect obstacles for adas applications. Is there a way to find the optimal burst frequency? experimentally or theoretically? for object detection. How does changing ...
1 vote
41 views

### How to remove ground detections of an ultrasonic sensor place in the front bumper of car? [closed]

I am working on a project to fuse the sensor information of 4 ultrasonic sensors place on the front of a car in the bumpers. The detections from the sensor would be generated not only from the ...
37 views

### Process this output of an off-the-shelf pressure sensor

I'm a software engineer working on theoretical things in my daily work. Lately I wanted to connect a pressure sensor, like this one, to a digital device that I can program, so that I can constantly ...
• 113
1 vote
142 views

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531 views

### Arduino DAC to Speaker

I'm working with an Arduino Due's two DAC pins. I want to output to a single 4W 5.7Ohm speaker to test my code, with the intent of eventually outputting to a set of speakers (woofer, mid-range, and ...
414 views

### How were the tones for DTMF chosen?

In my limited engineering knowledge, and limited research skills, I couldn't find a complete answer for the reasoning behind the chosen tones for DTMF. I did find a hint that said something about ...
64 views

### Signal convolution: continuous signals

I really didn't understand how to do it. Please, can anyone help me?? Determine h (t) * x (t) when h (t) and x (t) are the rectangular pulses shown in Fig. A. Plot the result of this convolution. I ...
2k views

### Nyquist Stability Theorem and Clockwise/Counter Clockwise Encirclements

According to argument principle, if a contour encircles a number of poles and zeros of a transfer function, the number of origin encirclements can be deduced by : ...
• 101
1 vote
66 views

### How do I calculate the delay of two signals from different sensors?

Suppose: I have two sensors attached to a vehicle I have recorded the output of these two sensors (for example GPS) during a test ride each sensor has a different frequency one sensor is way more ...
11 views

### In Digital Signal Processing, why is the spectrum of a signal with 'real' samples better than the spectrum of the same signal with padded samles?

Say we have number of samples to be 128 and a signal sin(2*pi*1000*n*Ts)+sin(2*pi*2000*n*Ts) sampled at 8kHz. Now say we have same signal but only N = 64 samples. But in order to create 128 samples, ...
47k views

### Why do color TVs make black and white snow?

If you let a color TV display something from an unplugged display port, it displays snow, right? Randomly varying black or white pixels on the whole screen. My guess was that the television was ...
• 973
1 vote
66 views

### Problem with RHP zero in transfer function

I have a transfer function with a RHP zero in $s=+1$, and I am trying to show in Matlab thath this limitation is present. In particular, initially I had a MIMO system, which I decoupled and then I ...
• 225
1 vote
40 views

### Fourier serie signal approximation

I have to approximate the red function with Fourier harmonics. I am calculating complex Ck the following way. I am not sure what to put for period - T (6 or 2pi or what?). What integral limits to ...
• 11
2k views

### Difference between Hysteresis, low pass filter and deadband in control theory?

I am trying to understand the fundamental difference between the following terms in the context of control systems: Hysteresis Low pass filter Deadband Are these just fancy names that can be ...
51 views

### How to determine data size created by sensor for calculation of signal processing and transmitting over wireless communication?

I want to build some sort of SAR sensor. Since radar works high speeds and creates loads of data this should be processed faster. I am trying to find algorithms to be used for this purpose. I am at ...
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