DSP Baseband Speech Processor for ham radio 

Gregory shows how a Baseband Speech Processor was designed, using a complete DSP approach, to downconvert an audio signal from 0 to 4 kHz to a zero-if negative 2 to 2 kHz quadrature signal.
The DSP runs on an AVR ATtmega164 microcontroller and implements all the processing stack in C++.
This device will be used as a baseband processor for SSB transmission, where direct SSB generation is accomplished by quadrature up conversion.
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References:
yehar.com/blog/?p=368
www.katjaas.nl/hilbert/hilber...
00:22- PCB and hardware overview
00:50 - Circuit behavior
01:56 - Baseband down conversion
03:32 - Analytics signal generation
05:54 - Negative frequencies
07:22 - Quadrature down conversion
09:46 - Overall DSP system
12:00 - Hardware, input and output filters

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