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please tell me how to reduce johnson noise? is it we use the capacitor parallel with the source that generate thermal noise? because the capacitor cannot dissipate power, or we use high resistance of input impedance of the next stage?
please give me some explanation about current noise, excess noise
what is spectral line noise??
is it we call the outside noise as stray noise??
quote : "radiation from oscillators inside equipment."
what kind of radiation?
hot bodies, like the sun <-- why the hot bodies generate noise in high frequency??
The slower the repetition. the lower the frequency of the noise
The level of low frequency noise from a sound source is determined primarily by the rate at which the changes in force, pressure, and speed are repeated. The longer the time between changes, the lower the frequency of the noise generated. The level of noise depends on the amount of the change.
Example
Two gears have the same pitch diameter but different numbers of teeth. If they rotate at the same speed, the gear with fewer teeth will produce a lowerfrequency noise.
High frequency sound is strongly directional and more easily reflected
When high frequency sound strikes a hard surface, it is reflected much like light from a mirror. High frequency sound does not travel around corners easily
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