A/D freq change

Status
Not open for further replies.
E

EmeraldW

New Member
I have a request to build an a/d converter for a guitar that would change the frequency of the incoming signal by a set amount. I was thinking that a microcontroller might be able to handle this but wanted to get some input.

Here is an example of what he needs:

Guitar pickup to a/d converter -> divide the sampled frequency by 2 and output as a digital signal or back through a d/a converter. The sample rate needs to be as high as possible.

Any thoughts?
 
Look at DSP's - although why doesn't he just buy one?, they are commercially available at low prices.
 
I'll check those out. If they will work, might not have to build something however I need to do it for six different inputs and build it into the guitar body.
 
EmeraldW said:
I'll check those out. If they will work, might not have to build something however I need to do it for six different inputs and build it into the guitar body.
Click to expand...

Check out Behringer pedals, they do two Octaver models, both have adjustable outputs one and two octaves lower - the cheaper one is only £20 odd.
 
Yeah I have pedals that will do it, but for this application each string has its own single coil pickup with its own output. All of the strings will be tuned to a set frequency and then each input will multiply or divide it before it is sent out the output.
 
View attachment 63331

This adds frequency but can something similar subtract?

Staying on the micro controller subject, if connected to the A/D of a pic, what value would it return in a sample? The datasheet is not real clear at my level of experience with the ad converter.
 
Last edited:
This adds frequency but can something similar subtract?
Click to expand...
That circuit is just a filter it will boost the signal level at certain frequencys but it will not change the frequency.

Staying on the micro controller subject, if connected to the A/D of a pic, what value would it return in a sample? The datasheet is not real clear at my level of experience with the ad converter
Click to expand...

It would return a binary number (10 bits) that represents the voltage level of the signal at the instant the sample was taken. Frequency sampleing is not usually done with an ADC.
 
Last edited:
I'll go back to looking at DSPs then. I've gone through a couple data sheets for them but I can't get my head around how to attack one.
 
EmeraldW said:
I'll go back to looking at DSPs then. I've gone through a couple data sheets for them but I can't get my head around how to attack one.
Click to expand...

I believe there are various examples at MicroChip for their dsPIC series, there might be something similar to what you're looking for?.
 
Status
Not open for further replies.

Similar threads

  • Question
A/D conversion PIC18F24K20
Replies
12
Views
6K
transconductance
T
DCO is a solution
2
Replies
37
Views
5K
granddad
D
  • Question
How to create a Bitmap For a Dinosaur using PIC16F877A
2
Replies
33
Views
7K
Tocaboca
T
T
  • Question
Basic programming for a cubloc
Replies
4
Views
434
rjenkinsgb
P
Anyone done a bluetooth mesh network? (Or zigbee)
Replies
4
Views
2K
ok2020
O
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…