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4 DSP
TS-590S CONTENTS 25
The manual notch filter is a notch filter with a frequency that can be shifted with the notch knob. The
auto notch filter is a notch filter that automatically tracks a beat frequency with an adaptive filter
technique. Both notch filters have the attenuation of more than 60 dB at the center frequency. Figure
4-7 describes how a weak signal emerges by the operation of AGC when the manual notch filter
eliminates an interfering signal in the power spectrum.
Figure 4-7 Clear Weak Signal by Eliminating Interference with Manual Notch Filter
(from above, Disabled to be Enabled)
4.3.3 Manual Notch Filter and Auto Notch Filter