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0
votes
1answer
55 views

Digital transmission of composite video [closed]

As the tittle suggest, I was thinking about making a wireless composite video transmission between a small camera (such as those sold for flying fpv) and a receiver. The two main specs it must have is ...
1
vote
0answers
43 views

What effect do R5,R6,R7,R8 have on the following DSBSC Modulator?

I know that the first 741 essentially adds m(t) and c(t).The gain should be 1 so why do we have 3.9kohms resistance ? What use is it ? The second 741 circuit is a band pass filter . I think there is a ...
13
votes
7answers
5k views

Is it possible to send multiple data bits on a single wire at once?

Is there an existing protocol or modulation method where multiple data bits are sent over a single wire at once or maybe an additional ground line (like serial communication)? I know there are ...
3
votes
3answers
119 views

Does an analog filter with complex impulse response exist in application?

Do we have in practice any analog filter that has a complex impulse response? Or they must have a real impulse response? Particularly, I am looking for a low pass filter that passes only a band in ...
2
votes
4answers
606 views

Implementation of Analog Matched Filter

I have been reading about communication theory and I was wondering if matched filters can be implemented with analog parts and what they would look like? If they can't be it seems like the matched ...
0
votes
2answers
163 views

Can someone please explain how this circuit works

It's s simple transmitter for light modulating certain sound we input to it. But i can't seem to know how this modulates the input signal.
3
votes
2answers
124 views

Optical Communication Two Sources One Receiver

I'm working on a project that requires me to wirelessly transmit analog information over a short range (few meters at maximum) to a receiving end from two transmitting ends. The tricky part is I can ...
0
votes
3answers
5k views

Send text data using FM frequencies [closed]

I want to design a device which receives basic text wirelessly, and outputs this text on a display. Using Wi-Fi is not a option. I have an idea that it would be possible to do this using FM ...
0
votes
1answer
702 views

How can I design a circuit that will generate a sinc function?

sinc function is given by sinx/x. How can i design a circuit to generate such type of signals what concepts should be used?
1
vote
1answer
409 views

Channel-Loss and Channel-Insertion-Loss

Read many time about Channel-Loss and Channel-Insertion-Loss, but confused that, is that same thing or opposite? Which has +ve or -ve values in dB? In reference to equalization of USB3.1.
0
votes
1answer
1k views

Calculating the Power of the Upper Sideband

I solved a question in a book that goes like this: If the carrier power is 1000 watts, what is the power in the USB at 70.7% modulation? I solved it using the formula: $$ P_{USB}=\frac{m^{2} P_{C}}{...
-1
votes
1answer
66 views

Analog modulation trainer

i am making communication trainer as my FYP i am confused on analog communication module .. I have 2 options first one to make different blocks of analog like mixers, filters , amplifiers ,phase ...
8
votes
2answers
771 views

How is data transmitted along with an FM broadcast signal?

When listening to FM radio on mobile using 3.5 jack headphone , sometimes the name of current show or other "xyz" information are displayed, how is that possible? How do analog signals contain that ...
1
vote
1answer
181 views

is it possible to load a transversal wave with a longitudinal wave

like in communication engineering for sending information what we do, we take a high frequency carrier and modulate it with the message signal so can we do the same thing like take a high frequency ...
2
votes
4answers
16k views

Sending data using 4 pin 3.5mm jack into smartphone

I have been looking around for some time and haven't found helpful information on how this is done. I am working on a project that intends to send data through the headphone jack to be processed by a ...
9
votes
3answers
17k views

Measuring the phase difference between two signals

I'm looking for an analog method of measuring the phase difference between two signals operating at frequencies in the range from (0 - 20 MHz). I'm wondering if there's an IC that does that or a ...