1. HUM: Hum is a low-frequency interference that is typically caused by electrical or mechanical vibrations. It is characterized by a continuous, droning sound and is often associated with power line interference or faulty electrical components. Hum can be particularly noticeable in audio systems and can degrade the overall sound quality.
2. NOISE: Noise, in the context of radio specifications, refers to any unwanted electrical or acoustical disturbances that degrade the quality of the transmitted or received signal. It can have various sources, including natural phenomena (such as atmospheric noise), man-made interference (such as electrical noise from devices, machinery, or electronic circuits), and thermal noise (random fluctuations in electrical signals due to thermal agitation). Noise can manifest as hissing, crackling, popping, or other undesirable sounds, making it difficult to understand or extract the desired information from the signal.
To mitigate the effects of hum and noise in radio systems, various techniques are employed, such as filtering, shielding, grounding, and noise reduction algorithms. By minimizing these unwanted signals, the quality and reliability of radio communication can be significantly improved.