| 11. | A specific frequency is removed using a notch filter.
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| 12. | An example is a UREI 562 Feedback Suppressor and the Ashly SC-68 Parametric Notch Filter.
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| 13. | Depending on the values you choose, it could be a bandpass filter or a notch filter.
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| 14. | A notch filter, usually a simple LC circuit, is used to remove a specific interfering frequency.
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| 15. | Analog technology allowed cable providers to offer standardized subscription packages using low-pass filters and notch filters.
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| 16. | An audio notch filter removes the 2, 175 Hz low-level tone from the actual transmit audio.
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| 17. | Thus, the early color TVs used only notch filters, which cut the luminance off at 3.5 MHz.
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| 18. | If that doesn't work, you'll have to escalate with a tunable notch filter, which can selectively block interference.
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| 19. | A good ground filter / notch filter will prevent a feedback loop up case ground which causes false alarms.
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| 20. | However, they were expensive and only high-end models used them, while most color sets continued to use notch filters.
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