javed007>co>uk
New Member
As part of my final year project i need to detect only 1 of 4 transmitted frequencies at any one time. The four frequencies are 300 Hz, 600 Hz, 1200 Hz and 2400 Hz. Depending on which frequency is detected, a different output occurs. The problem i have is which is the best method of detecting these frequencies but bearing in mind that these frequencies are to be transmitted along telephone cable. I know that only frequencies up to about 3200 Hz may be transmitted along telephone cable. I have looked at bandpass filters but i am running out of time and i am having technical diffculties with single op-amp based band pass filter circuits i have used. Is anyone able to offer a solution to these problems that would be doable?
Thankyou.
Thankyou.