Don Reid, W7DMR, is doing some fine work on porting 700D to the SM1000. http://www.rowetel.com/?p=6413
- David On 14/09/18 19:02, Tomas Härdin wrote: > https://en.wikipedia.org/wiki/Echo_suppression_and_cancellation > > "Echo control on voice-frequency data calls that use dial-up modems may > cause data corruption. Some telephone devices disable echo suppression > or echo cancellation when they detect the 2100 or 2225 Hz "answer" > tones associated with such calls, in accordance with ITU-T > recommendation G.164 or G.165. " > > https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/voiceport/confi > guration/15-mt/vp-15-mt-book/vp-cfg-echo-canc.pdf > > "Additionally, G.165 defines the disabling of echo cancellers in the > presence of 2100 Hz signals with periodic phase reversals in order to > support echo cancelling modem technology (V.34, for example), which > does not work if line echo cancellation is performed in the connection" > > /Tomas > > mån 2018-09-10 klockan 11:04 +0700 skrev Đích Kiều: >> Hi everyone, >> >> Anyone working on Freedv on PSTN network ? I’m have a problem about >> hybrid echo cancel in PSTN network. Half-duplex freedv work well. But >> when I run full-duplex freedv in PSTN, hybrid echo cancel from PABX >> make demodulator don’t work. Anyone can show me how to resolve my >> problem? >> >> Thank you. >> >> Sent from my iPhone >> >> _______________________________________________ >> Freetel-codec2 mailing list >> Freetel-codec2@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > > _______________________________________________ > Freetel-codec2 mailing list > Freetel-codec2@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > _______________________________________________ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2
