Dear All ...
Is there some simple IC (not a DSP) for the detection of the ringback tone on telephone lines? I've searched the web without success.
Any hint will be appreciated.
Thanks
egeorgiev
can any body suggest me a very good circuit of ring back tone detection using NE 567? the frequency of center should be at 440 hz and 567 output should not be activated at the reception of reject tone at phone line.