Hello James, Nice work on getting your version of the SM1000 hardware/software working. If the rx side is working you must bve very close.
1/ Nothing special, I think I used most of the dynamic range of the ADC, so a few Vpp. Make sure the ADC input is DC biased at about 1.5V 2/ No they are identical - we compile the same Freedv API code for both the FreeDV GUI program and the SM1000. Are you seeing the clip led blink on the peaks of your signal in transmit? How does the FreeDV GUI scatter plot look with the signal from the SM1000? Do you get frames sync and a good (>15dB) SNR? Cheers, David On 16/01/16 13:17, DB.JIANG wrote: > > Dear VK5DGR, > Many Thanks to your and codec2 groups's effort on the project ,which > open a door for Ham to the DV. > I have tried to implement the SM1000 on the disco STM32F4 board(my > SM1000) and using the same IO and hardward interface with SM1000. Both > TX and RX work now,but when I using the FreeDv to decode the modulated > signal produced by my SM1000, the voice sound strange in some word of a > sentence. That means a huge distortion occured in that word period. If I > record the signal sent by my SM1000 and play back it to my SM1000, the > issues is still there. Given that , the RX path of my SM1000 work fine > and can clearly decode the modulated signal sent by FreeDv. I had > checked the MIC amp. output signal level to the ADC, no clip found. > So I have to ask : > 1. If the encoder and modulator require some special input voice > level or other requirement? > 2. Are there any different between FreeDv and SM1000 in the codec2 and > fdmdv portion ,which might leading to the issue? > Thanks for all and Best Regards, > James Jiang > > > > ------------------------------------------------------------------------------ > Site24x7 APM Insight: Get Deep Visibility into Application Performance > APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month > Monitor end-to-end web transactions and take corrective actions now > Troubleshoot faster and improve end-user experience. Signup Now! > http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 > > > > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
