Investigation on Signal noise and Spurious tones
Gregory investigates the signal noise and spurious tones generated by the Baseband speech processor.
The signal path is analyzed from the input anti-aliasing filter, through the DSP and reconstruction filters, searching for the noise.
An interesting artifact is observed, where the oscilloscope sampling generates false spurious tones, leading to a wrong fist analysis.
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Video showing the project design:
• DSP Baseband Speech Processor for ham...
00:22 - Introduction
01:58 - Low frequency oscillation
04:02 - Signal noise investigation
10:38 - Oscilloscope sampling
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