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A filter which attenuates all frequencies below a designated cut-off frequency fc and passes all other frequencies greater than fc is called?
- a)band elimination filter
- b)band pass filter
- c)low pass filter
- d)high pass filter
Correct answer is option 'D'. Can you explain this answer?
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A filter which attenuates all frequencies below a designated cut-off f...
A filter is called high pass filter if attenuates all frequencies below a designated cut-off frequency fc and passes all other frequencies greater than fc. Thus the pass band of this filter is the frequency range above fc and the stop band is the frequency range below fc.
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A filter which attenuates all frequencies below a designated cut-off f...
Answer:
A filter that attenuates all frequencies below a designated cut-off frequency fc and passes all other frequencies greater than fc is called a high pass filter.
Explanation:
Filters are electronic circuits that allow certain frequencies to pass through while attenuating or blocking others. They are commonly used in various applications such as audio signal processing, communication systems, and image processing.
Types of Filters:
There are several types of filters based on their frequency response characteristics. Some of the commonly used filter types are:
- Low Pass Filter (LPF): Allows frequencies below a certain cut-off frequency to pass through and attenuates higher frequencies.
- High Pass Filter (HPF): Allows frequencies above a certain cut-off frequency to pass through and attenuates lower frequencies.
- Band Pass Filter (BPF): Allows a specific range of frequencies to pass through and attenuates frequencies outside this range.
- Band Elimination Filter (BEF) or Notch Filter: Attenuates a specific range of frequencies and allows frequencies outside this range to pass through.
Characteristics of a High Pass Filter:
A high pass filter attenuates all frequencies below its cut-off frequency and passes all frequencies above the cut-off frequency. The cut-off frequency (fc) is the frequency at which the filter starts attenuating the signal.
Key characteristics of a high pass filter include:
- Attenuation: High pass filters have a high degree of attenuation for frequencies below the cut-off frequency.
- Passband: The passband of a high pass filter encompasses all frequencies above the cut-off frequency.
- Roll-off: The roll-off rate determines how quickly the filter attenuates frequencies below the cut-off frequency.
Applications of High Pass Filters:
High pass filters are commonly used in various applications, such as:
- Noise Reduction: High pass filters can be used to remove low-frequency noise from audio signals.
- Signal Processing: They are used in audio equalizers to control the bass frequencies.
- Communication Systems: High pass filters are used to remove low-frequency noise and interference from signals.
- Image Processing: They are used to enhance high-frequency details in images.
Therefore, based on the given characteristics and the purpose of attenuating frequencies below a designated cut-off frequency while passing higher frequencies, the correct answer is option 'D' - high pass filter.
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A filter which attenuates all frequencies below a designated cut-off frequency fcand passes all other frequencies greater than fcis called?a)band elimination filterb)band pass filterc)low pass filterd)high pass filterCorrect answer is option 'D'. Can you explain this answer?
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