Noises present in audio signal may be of various kinds like environmental noises, transmission noises etc.
Frequency response, gain, noise, and distortion
Noise
If an RF signal is AM modulated with a analogue signal any noise will add or subtract to the amplitude of the RF signal and will be present in the audio signal after detection, also will the noise add itself to the audio signal, where as in digital communication a slight variation in the amplitude of the signal is of no concern because you only work with ones and zeros, it's high or it's low
A signal that is 2 times the frequency of the desired signal and causes interference is known as a second harmonic or harmonic interference. This occurs because harmonics are integer multiples of a fundamental frequency, leading to potential distortion or degradation of the desired signal's quality. Such interference can impact communication systems by introducing unwanted noise or reducing clarity. To mitigate this, filtering techniques may be employed to separate the desired signal from its harmonics.
Harmonic distortion belongs to all amplifiers, loudspeakers and simply all electrical equipment you use. When it comes to audio, the only effect you will hear is a constant resonant low noise if the speakers aren't good at handling harmonic distortion. None of the Bose speakers I have tested so far produce that noise, so you don't have to worry about that.
A noise suppressor helps reduce unwanted sounds in audio recordings by detecting and removing background noise or interference, resulting in a cleaner and clearer audio signal.
The noise ratio of an audio recording is the ratio of the signal (desired sound) to the noise (unwanted sound) present in the recording. It is a measure of how much unwanted noise is present compared to the desired sound.
A noise gate can be placed in the signal chain after the audio source and before any effects or amplification. By setting the threshold level correctly, the noise gate can automatically cut off any sound below that level, reducing unwanted noise while preserving the audio quality of the desired signal.
Noise is basically an unwanted signal which is mixed in fundamental signal while the distortion is a disturbed fundamental signal affected due to external disturbance. It is just like box. A box is compressed and its shape is disturbed while the box could also be destroyed by adding of the other materials like putting extra heavy material in it. In this way changing of the shape of the box by compression is considered to be distortion and disturbing the form by adding the material is considered to be noise.
A noise gate can be placed in the signal chain after the audio source and before any effects or amplification. By setting the threshold level appropriately, the noise gate will only allow audio signals above that level to pass through, effectively reducing unwanted noise during recordings or live performances.
The distortion factor is a measure of how much a signal deviates from its original form after passing through a system or device. It indicates the level of unwanted changes or alterations to the signal, such as noise, harmonics, or frequency shifts, which can affect the quality and fidelity of the signal. A lower distortion factor value indicates that the signal remains closer to its original form and is less affected by unwanted modifications.
The measurements include Signal to Noise Ration (dB), Total harmonic distortion (%) and Channel crosstalk (dB).
The quality of sound is determined by factors such as frequency response (the range of frequencies the audio system can reproduce accurately), signal-to-noise ratio (the level of background noise), distortion (any unwanted changes to the audio signal), and dynamic range (the difference between the loudest and softest sounds).
Place the noise gate towards the beginning of your signal chain to effectively reduce unwanted noise.
An unwanted signal is noise.
To effectively incorporate a noise gate into your pedal chain, place it towards the end of the chain after any distortion or overdrive pedals. Adjust the threshold and release settings to cut off unwanted noise when you're not playing, while allowing your clean signal to pass through unaffected. This will help maintain a clean and noise-free sound in your setup.
A noise gate is usually placed near the beginning of the signal chain, before any effects or amplification. This helps to reduce unwanted noise before it is amplified and becomes more noticeable in the signal.