The signal-processing tag has no wiki summary.
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2answers
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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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vote
2answers
49 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 ...
3
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3answers
123 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
79 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 ...
0
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1answer
73 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 ...
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6answers
198 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
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1answer
113 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 ...
2
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3answers
79 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
48 views
Inference about system causality
This is follow-up question to this.
For the inferences made below(may be wrong),
let $$h[n]=impulse\hspace{1.5mm} response\hspace{1.5mm} of\hspace{1.5mm} the\hspace{1.5mm} LTI\hspace{1.5mm} system$$
...
2
votes
2answers
76 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
93 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 ...
0
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1answer
151 views
Amplifying an audio signal
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 ...
