# Poles and zeros from FRF

How can I determine the poles and zeros of a system given its frequency Response?

I can understand how one can find the Frequency response from poles and zeros of a system. Is it possible to do it the other way round?

• Do you also have phase information or just frequency-magnitude plot? – jojek Jun 22 '14 at 16:21
• I have just the Frequency magnitude plot – user10289 Jun 22 '14 at 16:54
• The poles and zeros are not uniquely determined by the the magnitude of the frequency response. – Matt L. Jun 23 '14 at 7:55