Question
Which of the following types of noise are removed by a noise blanker?
Answer Options
- A) Broadband white noise
- B) Impulse noise
- C) Hum and buzz
- D) All these choices are correct
Correct Answer: B
Explanation
A noise blanker is a specialized circuit, typically located in the Intermediate Frequency (IF) stage of a receiver. Its function is to detect and momentarily shut down the receiver’s IF amplifier during the very short duration of a noise pulse, a process known as ‘blanking.’
Because of its function, the noise blanker is primarily designed to remove Impulse noise. Impulse noise is characterized by very short, sharp, repetitive bursts, such as automotive ignition noise or electric fence clicks. The blanker is ineffective against continuous noise like white noise or constant tones like hum.
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