All Questions
10
questions
2
votes
1
answer
49
views
How a switching mixer works in this example circuit?
I am reading about lock-in amplifiers and came across this example circuit of a mixer:
You have one sinusoidal input signal $e_1$ with a phase $\phi_1$ and the local oscillator has a square-wave ...
- 229
22
votes
12
answers
8k
views
How do computers store sound waves just by sampling the amplitude of a wave and not the frequency?
All of this just doesn’t make sense though.
I mean, doesn’t the amplitude represent the loudness and the frequency the pitch? Aren’t they completely independent from each other?
Is the book just ...
- 390
0
votes
1
answer
398
views
Removing $1/f$ noise with lock-in-amplifiers
On the Wikipedia page for 1/f noise (at the bottom of the page) it suggests the noise can be reduced if the signal of interest is at DC. DC signals suffer from significant 1/f noise, so one method of ...
- 1,816
0
votes
1
answer
185
views
What does the phase discriminator portion of the Costas Receiver do mathematically?
What does the phase discriminator portion of the Costas Receiver do mathematically?
The output of the $I$-channel is $ \frac{1}{2}A_C \cos \phi \, m(t) $. Which means for small deviation of phase $ \...
- 33
0
votes
1
answer
45
views
Can the telephone signals be tapped by an intruder? [closed]
I have a doubt.
There are lots of telecommunication signals moving across the world, at the same time.
For example, take the case of mobile phone calls.
Millions of speech signals are propagating ...
- 12.5k
2
votes
1
answer
1k
views
Larsen effect and pitch of sound
Why Larsen effect produces always high pitched sounds, never low pitched?
- 1,343
1
vote
2
answers
4k
views
Electronics book for physics undergraduates
I am going through very hard time studying electronics, I studied little electronics at high school (what is diode, transistor, etc). Now in clg now I need electronics to study, I don't understand ...
1
vote
1
answer
425
views
Normalizing temperature data of CPU sensors to ambient [closed]
My scenario:
I want my application to stop or take some decision based on temperature. say like if my ambient is morethan 41 i want to switch off the application and we do not have an separate ...
- 119
36
votes
7
answers
12k
views
Why can't you hear music well over a telephone line?
Why can't you hear music well well over a telephone line?
I was asked this question in an interview for a university study placement and I unfortunately had no idea.
I was given the hint that the ...
- 499
1
vote
3
answers
910
views
Electronic filter
Can you explain, please, step-by-step how an electronic filter does work?
For example, high pass filter. I know It's a trivial things, but I can't get it completely. Don't bring me formula and etc. ...
- 19