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.

Support the channel, helping me bring more videos like this one: https://patreon.com/allelectronics

Subscribe to the channel: https://www.youtube.com/channel/UC0UDLi6A-auU9YetO-ShZug/

References: http://yehar.com/blog/?p=368 https://www.katjaas.nl/hilbert/hilbert.html

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 ... https://www.youtube.com/watch?v=XVTxv1jreog