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
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