Sample rate? #74
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Hello! I am trying to use the same microcontroller as here (ATMEGA328P) for signal processing applications similar to this one, and I am wondering what sampling rate the ADC is used here for the input of the radio frontend. In the code the macro F_SAMP_TX seems to define this, but if this is the value in Hz (which it seems to be), 4.8 kHz seems low. Is this correct? Thanks in advance for any guidance. |
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Replies: 1 comment 1 reply
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Sorry, seems I did not understand the code for this one. Seems F_SAMP_RX was what I was actually looking for, 62.5 kHz seems actually correct. |
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Yes you are correct, a sample rate of 62500 is used. This is oversampling the QSD mixer outputs and then downsampling to 7812 samples/s for the I and Q. We oversample in order to make sure that alias products are well enough attenuated. Thanks for your interest in the project and for trying to understand the concepts behind. |
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Sorry, seems I did not understand the code for this one. Seems F_SAMP_RX was what I was actually looking for, 62.5 kHz seems actually correct.