New Block Diagram; Internet is bad
By request, I have updated the block diagram to be readable.

I have spent some time investigating components which could meet the project requirements, and I have likely candidates for the ADC, the DDS, and the DSP/MCU which can work together harmoniously. I would love to provide an update on my decision-making process for these components.
However…

DOCSIS standards state that an SNR of 37 dB is considered the minimum normal signal quality, and 33 dB is considered the minimum acceptable limit. All of my channels are 3–7 dB below the minimum acceptable limits, with five completely failing to lock. Consequently, it took about five minutes for Medium to upload each image in this post. Clearly, there is a problem.
The fix will take a few days. When I return, I will discuss my choices for the ADC, the DDS, and the DSP/MCU.
Until then, here’s a preview:
ADC: ADS4222 (Texas Instruments)
DDS: AD9913 (Analog Devices)
DSP: OMAP-L132 (Texas Instruments)

