Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Low-pass to Bandpass transformation in Matlab ???

Status
Not open for further replies.
E

epp

Full Member level 5
Joined
Mar 4, 2004
Messages
243
Helped
12
Reputation
24
Reaction score
4
Trophy points
1,298
Activity points
1,847
lowpass to bandpass

I am trying to make lowpass IIR filter as the sum of two allpass sections.
After that I have to make transformation of prototype lowpass filter as:
z^-1 ---> t2(z)=-z^-1*(a+z^-1)/(1+a*z^-1) and I will get bandpass one.
I have no idea how to make this. Please help me.
Regards
 

lowpass to bandpass filter matlab code

I dont remmebre the LP-BP transformation formula but if what you have type is correct then:

1.Get your LP filter transfer function - in z domain it is polinomial in numeration and polinomial as denumerator

2. make substitution what you have type in your mail.

3. Simplify the transfer function and you will get the transfer function of the BP filter

If you have to implement this filter in the hardware then let me know.
Probably i will be able to give you some advice

luck
dora
 

transform lowpass to bandpass

Hi.
Dora and Sam_ thank you.
My reference IEEE paper is "Design of recursive digital filter with variable characterisics". First I made LP-LP transformation and it is correct. In such a filter I apply this transformation LP-BP but amplitude characteristics does not look like as bandpass one (but look as everything else :) ).
Also I am not sure that transformation LP-BP is correct. Some +- must change places but I also tried that and with no success.
Maybe theoretical help will be usefull to me (eg *.pdf etc.)
Regards.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top