Questions tagged [signal-processing]

the analysis, interpretation and manipulation of signals

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2answers
2k views

GPS update rate

My thought process: I i'm am looking for a GPS that updates fast enough to actually read its position traveling 130 miles an hour ( I did some math and think 5 times a sec up date rate would get me 17 ...
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2answers
3k views

Down-Conversion of RF signal

I have a basic question about down-conversion of RF-signals. The ideal scenario is described as follows. Given a RF-signal (coming from an antenna), i.e., a real-valued function x(t), and given a ...
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2answers
1k views

Connect DHT22 to serial connection

I'm trying to find a way to connect a temperature and humidity sensor DHT22 to an XBee's RX/TX pins without an additional microcontroller(Arduino or anything that needs software) or reprogramming the ...
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2answers
254 views

What does “two signals aliasing to each other” mean?

So I just read something that two signals are aliasing to each other. I know what a single signal is being aliased - that is when sampling rate is not higher than or equal to the Nyquist rate. But I ...
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1answer
69 views

Understanding the concepts of sounds analysis [closed]

I'm trying to understand many concepts behind sound analysis. Here's what I'm trying to understand: What's sound & sound wave? What's sampling and hertz? And how to do sampling? (starting from ...
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0answers
1k views

100kHz active filter design

I am designing a basic 100kHz active bandpass filter using opamps (LF353). I am only interested in receiving the 100kHz frequency (might drift a few kHz) from my input signal. I have used a basic ...
1
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1answer
118 views

DPD Auto and crosscorrelation

I am trying to learn signal processing and digital pre-distortion. http://www.altera.com/end-markets/wireless/advanced-dsp/predistortion/wir-digital-predistortion.html I am currently trying to auto ...
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2answers
142 views

How to get the phase response of an arbitrary LTI system?

If I have a frequency response (of a discrete-time system) composed of several complex exponentials such as $$H(e^{j\omega}) = A_0 + A_1 e^{-j\omega } + A_2 e^{-j\omega t 2} + A_3 e^{-j\omega 3} + ......
3
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1answer
707 views

Amplification circuit for a limited range of output signals

I have a sensor that puts out a signal between 0 and 25mV. Of that range, I am only interested in the 16mV to 22mV portion. The output should primarily be a DC signal, and the AC response, if any, ...
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2answers
6k views

STM32F4 - Digital Signal Processing ( DSP )

At this website, I have read that STM32F4 microcontrollers have DSP instructions. To quote: It also implements a full set of DSP instructions I am beginning to learn embedded C programming with ...
2
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3answers
820 views

RSSI to distance moving average

I'm calculating distance from an RSSI, and as it seems to have quite a high variation I want to take an exponential moving average. My question is: Where in this calculation is it most applicable to ...
3
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2answers
600 views

Verifying design that uses guard ring

I had a colleague design a board for pH sensor amplification based on schematic (fig 1)and spec in a paper. The paper recommends using the spec noted in figure 3. It uses a guard ring to reduce ...
1
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1answer
1k views

How to connect a microphone to apply audio signal to electronic circuit?

I am working on a project where we have to design a band pass filter signals in audio frequency range. We have tested the filter design using Signal generator already, and now we want to see if it ...
0
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1answer
175 views

What are the advantages of recursive prony?

Suppose I have following signal: ...
1
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1answer
262 views

MIMO with STBC example - How to derive SNR?

Conosider 2 x 2 MIMO system with the channel matrix H : $$ H = \begin{bmatrix} 1&1/2\\ 0&\sqrt{3}/2 \end{bmatrix}, $$ and transmit signal matrix S : $$ S = \begin{bmatrix} s_1&-s_2^*\\ s_2&...
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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 ...
2
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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 ! ;)
3
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2answers
392 views

Sampling Theorem

\$x(t) = \frac{\sin(2000\pi t)}{\pi t}\cos(1000\pi t)\$ is sampled with sampling period \$T_{s} = \frac{1}{8000}\$, to obtain the sampled signal \$x_{p}(t)=x(t)p(t)\$, where \$p(t)= \sum_{n = -\infty}^...
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4answers
177 views

Is this a valid sinusoid?

The given image is from first edition of this book To me the first sinusoid seems valid, in sense that values can be computed at different points. However, in the case of second sinusoid I fail so ...
1
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1answer
300 views

Using ADC AD9057

I use AD9057 with fpga in my oscilloscope project. Here is the ADC pin-out I use the following scheme to test ADC: VREF OUT connected to VREF IN, this gives internal reference voltage +2.5V Vd +3.3 ...
2
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2answers
177 views

Analog to digital converter

I have very little electrical knowledge. So here is my question. I need to test some wiring harnesses if they grouped like it should be. There is 70-80 points. differencing on the harness, these ...
6
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4answers
3k views

Why consider Linear Time-Invariant systems?

Okay this could be a very silly question but I am asking it anyway. Why do we consider in most cases of signal processing that the system is Time-invariant? Is it because most signals are linear and ...
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1answer
995 views

Why AD834+AD811 voltage controlled amplifier does not accept around ground signals?

I have setup a circuit according to page 15 of AD811 Op-Amp datasheet . The design receives 0.5-1.2 vpp sine wave between 1Hz-50MHz from AD9850 DDS and it also has around +0.7 to +1 v offset voltage. ...
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1answer
75 views

Variable voltage signal importing and procesing using computer in real time

I am working on a project where I need to import an analogue signal into a computer for real time processing. Signal strength is about 2-10V. I found this solution where it is possible to use the ...
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1answer
593 views

AD9850 comparator problem. How to calculate is frequency?

I want to convert a sine wave produced from AD9850 (opens *.pdf) into square wave with its inbuilt comparator. AD9850 has a fast comparator with 3ns rise/fall time and propagation delay= 5.5ns. ...
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2answers
2k views

How to protect a signal from output short circuit?

I have made a signal generator based on DDS and amplified its output to 0-20 V pk-pk. Now I want to prepare the output side. My main concern is short circuit protection to prevent damage to my device. ...
2
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4answers
2k views

How to connect op-amps serially in high frequencies?

Assume I have a 50MHz signal with 300mV pk-pk amplitude and I want to amplify it to 8v pk-pk. For this purpose I selected AD8055. This is a 300MHz VFO that is suitable for this purpose. I selected ...
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1answer
320 views

Can Emitter Follower BJTs work with large signal?

Sorry for such elementary question. As anyone knows emitter follower design of BJT has some specifications . For example they are suitable for driving low impedance loads and so. But because the ...
2
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2answers
202 views

Wireless signal reflection

When two devices are connected via wireless, one device sends a character using its TX line, and the character is received by the other device on its RX line, and vice versa. My question is, RF ...
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2answers
1k views

How to use Op-Amps as comparator in high frequencies?

An Op-Amp wired as a comparator can change many wave form (including sine wave ) into square wave but I asked about correct feedback resistor and input resistor values of an op-amp here and we came to ...
10
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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 ...
2
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2answers
1k views

BJT variable Voltage Gain Distortion

This is a very basic question. I want to have a very simple BJT Signal Amplifier with variable voltage gain. Let's think about a common emitter with an emitter resistor like this: The input signal is ...
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1answer
3k views

which one is better for smoothing a sine wave: Low pass filters or a serially connected inductor?

Smoothing a sine wave is my main concern in this question. I have a sine wave made by DDS that in higher frequencies shows some steps. Normally in every electronic class it is heard that the best ...
3
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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 ...
3
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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
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3answers
2k views

Extract information from video through HDMI input processing

I need to develop a prototype of a device that does the following: Take an HDMI input For each frame extract a small region of the screen. It's a small bar indicating some changing value. Convert ...
3
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1answer
225 views

Inference about system causality

This is follow-up question to this. For the inferences made below(may be wrong), let $$h[n]=impulse\hspace{1.5mm} response\hspace{1.5mm} of\hspace{1.5mm} the\hspace{1.5mm} LTI\hspace{1.5mm} system$$ ...
4
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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 ...
2
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2answers
567 views

Signal to the audio jack of a smart phone

I have a 3.3 V square wave that consists of groups of 5 pulses at either 12.5 khz and 15.625 khz. Each group of 5 pulses represents either a 1 or a 0. I would like this signal to be passed to a ...
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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 ...

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