4 different frequency signals in a single channel

Status
Not open for further replies.
H

Harish Achar

Member level 1
Joined
Mar 15, 2012
Messages
39
Helped
3
Reputation
6
Reaction score
3
Trophy points
1,288
Activity points
1,575
hi there,

i have a doubt here, am using a microcontroller and want to generate 4 different frequency signal from a single channel i mean single pin.. is it possible to do this....?
Is there any technology or alternates to do this...?
 

There is the concept that allows myriad sine frequencies to be transmitted in a single wire.

Sum them all together. Amplify as necessary. Transmit.

At the receiving end, install a narrow bandpass filter to extract the various frequencies.
 

microcontroller only can creat digital signal,I don't think you can creat.
 

Hello!

microcontroller only can creat digital signal,I don't think you can creat.
Click to expand...

Probably we don't use the same series. Most of those I know (MSP430, PIC, ARM...) have ADC
and some of them also have DACs.

i have a doubt here, am using a microcontroller and want to generate 4 different frequency signal
from a single channel i mean single pin.. is it possible to do this....?
Click to expand...

Your question has already been replied. But you may consider rethinking your design. What would
be the point of generating these waves? A kind of DTMF encoding? Otherwise there might be
other solutions to your problem, so it might be a good idea to explain a little bit more what you
want to do.

Dora.
 
binlch.lv said:
microcontroller only can creat digital signal,I don't think you can creat.
Click to expand...

Does a Digital to Analog Converter (DAC) ring a bell?

Some microcontrollers actually have onboard DACs as peripheral modules, even those that do not, can certainly control a DAC with an SPI, I2C or Parallel interface.


BigDog
 
An analog signal generated by pwm at a digital pin can also carry multiple frequencies.
 

Hi,

many answers....

but I´m missing a lot of input.
* Are the signals sinsoid or square wave or other waveform?
* What are the voltage levels? Are they constant?
* Are the frequencies alternatively or may there be multiple frequencies at the same time?
* What is the purpose of it? What is the reciever?

Klaus
 

binlch.lv said:
microcontroller only can creat digital signal,I don't think you can creat.
Click to expand...

Understand how a delta-sigma DAC + low pass filter works. Very elegant.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…