| ??? 02/25/08 00:54 Read: times |
#151372 - I did not look at this data sheet.... Responding to: ???'s previous message |
But I have, in times gone by, worked with several types of progress detectors. One type had various filters that were programmed to respond directly to the tone frequencies that are found in particular answer back tones. I.E. It worked much the same as a DTMF detector. Others, and the modem stuff I have studied, worked on the premise of the tone cadence detection.
The first chip I used was a long time back and made by Signetics. The number NE5900 comes to mind but I could be wrong....it was in the mid '80s. http://www.eetasia.com/ARTICLES/...S=DOWNLOAD Michael Karas |
| Topic | Author | Date |
| call progress tone detection by MT8880C | 01/01/70 00:00 | |
| Before You Start - The usual warnings | 01/01/70 00:00 | |
| The MT8880 cannot detect all possible CP tones | 01/01/70 00:00 | |
| This Is Why... | 01/01/70 00:00 | |
| Do I have this right? | 01/01/70 00:00 | |
I did not look at this data sheet.... | 01/01/70 00:00 | |
| still i don\'t know what to do | 01/01/70 00:00 |