Questions tagged [signal-processing]

the analysis, interpretation and manipulation of signals

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7
votes
3answers
31k views

How to make a peak detector circuit

I wasn't able to find a good guide on this and I only recently discover electronics for myself so have a little knowledge. I was able to find something like what I need Article How does the circuit ...
6
votes
3answers
1k views

dimensional analysis of the Shannon-Hartley theorem

In the infamous Shannon-Hartley theorem the bandwidth of the channel is measured in Hz (Hertz) but the channel capacity is measured in bps (bits per second). So, either I'm missing something obvious ...
1
vote
2answers
635 views

Solving Difference Equation Using Z-Transform

I was trying to solve a problem given in my textbook. I have attached the solution given in the book. I thought some modifications where needed to it and tried to solve in a different way. I ended ...
0
votes
4answers
3k views

How to turn a pulsed signal into a continuous one?

I have a pulse signal at 1 hz which goes high +5V and low 0V. How do i turn it into a continuous one? +5V. i have searched in different places and what i found says that there are different methods ...
37
votes
6answers
7k views

Is analog signal arithmetic faster than digital one?

Would it be theoretically possible to speed up modern processors if one would use analog signal arithmetic (at the cost of accuracy and precision) instead of digital FPUs (CPU -> DAC -> analog FPU -> ...
21
votes
3answers
5k views

Difference between bit rate and baud rate and its origins?

Everyone seems to have different definitions everywhere I look. According to my lecturer: \$ R_{bit} = \frac{bits}{time} \$ \$ R_{baud} = \frac{data}{time} \$ According to manufacturers : \$ R_{...
4
votes
4answers
11k views

Meaning of causal signal

What exactly does causal signal mean? Causality,as I see it is a property of a system wherein the output at PRESENT is dependent ONLY on PAST and PRESENT values of input.Here we have a reference of ...
10
votes
3answers
12k views

Which one is better as voltage divider: resistive, capacitive , low pass filter,…?

There are different types of voltage attenuators for AC signals ( a short explanation is here). The most well known is a resistive one. Others like capacitive, inductive or low pass filters are ...
1
vote
2answers
1k views

Envelope detector

I would like to have the envelope from a signal using a simple circuit composed of a diode and a low pass filter. I know : *Tam > t >> Tcarrier *The diode must be a germanium diode because of the ...
0
votes
3answers
1k views

Sampling Rate Passband Signal

What is the maximum/minimum possible sampling rate for the signal to be full recovered for a passband signal?
0
votes
2answers
70 views

frequency modulation and incoming signal selection

I have some understanding of what frequency modulation entails - it entails "adding" a new frequency to the frequency spectrum of a signal. But how, exactly, is a modulated signal selected in the ...
18
votes
8answers
6k views

Writing DSP algorithms directly in C or assembly? [closed]

I m working on a DSP project(IIR filtering) on an Analog Devices digital signal processor(BF706) with the compiler suite coming with it, CrossCore Studio. It has some examples for simple DSP stuff ...
24
votes
14answers
2k views

How is it that two electric currents can travel in opposite directions on the same wire, at the same time, without interfering with each other?

An Introduction to Information Theory: Symbols, Signals and Noise, by John R. Pierce, says the following: While linearity is a truly astonishing property of nature, it is by no means a rare one. ...
14
votes
4answers
2k views

Why would you put your input amplifier in front of your filtering for an ECG signal?

In this article at eetimes.com they show the signal chain for measuring an ECG. The raw signal of an ECG contains noise and offsets at least a magnitude larger than the real signal. (Some few mV ...
7
votes
4answers
8k views

Performing FFT at low frequencies but high resolution?

To put this in context, I'm looking to achieve both high speed and high accuracy for measuring biosignals through the FFT. I'll describe a quick example to see if I understand this properly as well as ...
3
votes
1answer
248 views

Calculating the entropy rate of ADCs

Formally, the entropy of a normal distribution is:- $$ \frac{1}{2} \log(2 \pi e \sigma^2) $$ So if you're sampling a random (normally distributed) signal, that would seem to be the rate of entropy ...
5
votes
1answer
1k views

Converting a tachometer signal into something a microprocessor can understand

I am attempting to build a digital dashboard for my car (a 1998 honda civic), I have run into a bit of trouble, wherein the tachometer signal is quite hairy. I was wondering if someone would lend me a ...
4
votes
1answer
372 views

Am I using Shannon-Hartley Theorem and thermal noise correctly here?

I'm trying to learn about noise, sensitivity, and the Shannon-Hartley theorem, and I'm using some specs for a LoRa node IC to try it out. The Shannon-Hartley theorem says that the maximum data rate \$...
3
votes
1answer
280 views

Can I differentiate between a UPS, Generator and Main sine wave using a micro-controller?

Are there any distinguishing features of a mains power supply that will allow me to tell the difference between mains power supplied by the utility company, a generator, or a UPS? How can I use a ...
3
votes
1answer
225 views

Inference about system causality

This is follow-up question to this. For the inferences made below(may be wrong), let $$h[n]=impulse\hspace{1.5mm} response\hspace{1.5mm} of\hspace{1.5mm} the\hspace{1.5mm} LTI\hspace{1.5mm} system$$ ...
1
vote
0answers
462 views

Problem with biased circuit for oxygen sensor (SGX EC410)

I have designed a circuit for an SGX EC410 oxygen sensor by using these application note -PAGE 4, FIGURE 4 - (http://www.sgxsensortech.com/content/uploads/2014/08/A1A-EC_SENSORS_AN2-Design-of-...
0
votes
1answer
110 views

A very basic question about DAC conversion in a sound card

This is a conceptual question about how a sound card converts digital data to analog. To illustrate this let's say we have constructed a discrete data which represents a sinusoid with particular ...
6
votes
4answers
4k views

How does a preamplifier improve the Signal-to-Noise Ratio (SNR)?

I'm trying to understand how a preamplifier works. Is the noise not amplified the same amount as the signal? If so, how is that done in the preamplifier?
3
votes
1answer
250 views

What are the major components of a read-out circuit for a silicon photomultiplier array?

I would like to couple a 2x2 silicon photomultiplier array (where each of the silicon photomultipliers serves as a "pixel" analog output) with a plastic scintillator piece in order to measure the ...
3
votes
1answer
481 views

LF-RFID demodulation

I'm trying to read a LF (low frequency) RFID transponder, it works in the following manner: It uses load modulation, the receiver (the base station) generates the carrier and the transponder modulates ...
3
votes
6answers
573 views

New to microcontrollers…options for getting up and going cheaply

I've never designed a microcontroller circuit before, but have programmed them on dev boards. I've Googled around for a while, but haven't found a definitive answer. Maybe I'm missing something. I ...
2
votes
3answers
1k views

Detect string plucking in electric bass guitar? [closed]

Anyone knows any idea of how can I detect plucking in a string of a guitar with an arduino (possibly using the pickup signal)? Thanks in advance ! ;)
2
votes
2answers
2k views

How to get BPSK data from I/Q signal

I am using AD8347(0.8 GHz to 2.7 GHz Direct Conversion Quadrature Demodulator) to demodulate a BPSK modulated carrier wave. There is no intermediate frequency used. By feeding the signal into this ...
2
votes
1answer
74 views

When to process beam forming algorithms?

I am building a system that uses beam forming to locate noises at different spots. All of the spots will be in front of the microphones (180 degree range of spots). My first question is if the beam ...
2
votes
1answer
636 views

How to shift signal phase in matlab from this circuit?

The circuit shown is in matlab. Sinus signal is provided by vpin by connecting from PCI. The sinus signal is looks like on the scope. The problem is i want to shift signal phase, from the picture ...
1
vote
1answer
814 views

How to filter noise of different frequency based on motor power

I am taking torque readings from strain gauges on an actuator and trying to filter the signal to look usable. I have already put in place a median filter that reduces sporadic spikes. When I have the ...
1
vote
1answer
140 views

Questions on interfacing circuit for an NPN input

I have to use this sinewave outputting sensor with the NPN input of this converter. My previous question was related to the same issue but the question was about a totally different circuit design i.e....
0
votes
1answer
125 views

Is there a specific preferred order of operation of signals?

Basic Signal Operations Performed on Dependent Variables-- The periodicity of the signal is varied by modifying the horizontal axis values, while the amplitude or the strength remains constant. These ...
0
votes
2answers
113 views

Guitar to MIDI conversion

I am wanting to measure the pitch of a single guitar string and convert into MIDI within 10ms. FFT takes too much time, I was wondering what other options are worth looking at? The main issue is ...
0
votes
1answer
101 views

Glitchy pulses in a data acquisition system

A single-ended -10V to +10V 16-bit data acquisition system is composed of 16 single-ended channels where two of the channels are analog outputs and the rest are analog input channels. The transducers ...
0
votes
3answers
332 views

Difference between bit rate and baud rate? [duplicate]

Everyone seems to have different definitions everywhere I look. According to my lecturer: $R_{bit} = \frac{bits}{time} $ $R_{baud} = \frac{data}{time} $ According to manufacturers : $R_{bit} = \...
-1
votes
1answer
1k views

Amplifying an audio signal [closed]

Preface Essentially, I want to use the analog signal coming out of my smartphone when I play music to modulate LEDs and piezo electric elements. Initially, I thought that if the raw power output is ...
-1
votes
2answers
356 views

Can anybody give proof about features of phase and magnitude spectrum?

I have read that from Fourier transform we obtain magnitude and phase spectrum. The magnitude spectrum tells you how strong are the harmonics in a image and the phase spectrum tells where this ...
-3
votes
2answers
470 views

Edge detection circuit (for rotary encoder)

I managed to decode a rotary encoder using an arduino to read the input signal but I noticed other than the interrupts, the code is mainly made up of lines similar to: "IF this AND that OR that AND ...