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Minor TX changes.

pull/35/head
guido 2020-10-21 23:21:46 +02:00
rodzic fee58f0017
commit 2c34938ab9
1 zmienionych plików z 3 dodań i 3 usunięć
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QCX-SSB.ino
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@ -1559,9 +1559,9 @@ inline int16_t ssb(int16_t in)
for(j = 0; j != 15; j++) v[j] = v[j + 1];
dc += (in - dc) / 2;
//dc += (in - dc) / 2;
v[15] = in - dc; // DC decoupling
//dc = in; // this is actually creating a high-pass (emphasis) filter
dc = in; // this is actually creating a high-pass (emphasis) filter
i = v[7];
q = ((v[0] - v[14]) * 2 + (v[2] - v[12]) * 8 + (v[4] - v[10]) * 21 + (v[6] - v[8]) * 15) / 128 + (v[6] - v[8]) / 2; // Hilbert transform, 40dB side-band rejection in 400..1900Hz (@4kSPS) when used in image-rejection scenario; (Hilbert transform require 5 additional bits)
@ -1628,7 +1628,7 @@ void dsp_tx()
#endif //QUAD
OCR1BL = amp; // submit amplitude to PWM register (takes about 1/32125 = 31us+/-31us to propagate) -> amplitude-phase-alignment error is about 30-50us
adc += ADC;
//ADCSRA |= (1 << ADSC); // causes RFI on QCX-SSB units (not on units with direct biasing); ENABLE this line when using direct biasing!!
ADCSRA |= (1 << ADSC); // causes RFI on QCX-SSB units (not on units with direct biasing); ENABLE this line when using direct biasing!!
int16_t df = ssb(_adc >> MIC_ATTEN); // convert analog input into phase-shifts (carrier out by periodic frequency shifts)
adc += ADC;
ADCSRA |= (1 << ADSC);