What causes noise in professional audio
1. Circuit noise inside the device
Professional audio equipment has an indicator-signal-to-noise ratio. Due to
the electrical noise generated by the internal electronic components, when one
device works alone, the required index can be achieved, but when multiple
devices are cascaded, the noise will accumulate and increase. In practical
applications, some low-grade civilian audio equipment will have a lot of AC
noise due to poor internal power supply filtering, which will sometimes cause
serious noise in professional audio systems.
2. Power interference noise
The external interference of professional audio equipment, in addition to
electromagnetic car radiation, the introduction of interference noise in the
power supply part will be another main cause of noise. The urban power grid has
formed a very serious source of interference due to the joint access of various
lighting equipment, power equipment, and control equipment.
For example, lighting control equipment, air conditioners, motors and other
equipment connected to the same power grid will generate spikes, surge currents,
and ripple voltages of different frequencies on the power line, which will enter
the power supply of professional audio equipment through the power line. There
will be some interference noise that cannot be effectively filtered by the power
circuit of the audio equipment, and noise will inevitably form inside the
equipment. Especially high-power equipment with electromagnetic compatibility in
the same power grid that does not meet the requirements is the main reason for
interference with audio equipment.
3. Electromagnetic radiation interference noise
Environmental stray electromagnetic radiation interference, such as
high-frequency electromagnetic radiation interference of communication equipment
such as mobile phones and walkie-talkies, electrical pulse radiation such as
elevators, air conditioners, car ignitions, and electric welding in the
surrounding environment. The generated radiation will be directly mixed into the
transmission signal through the audio transmission line to form noise, or pass
through the casing of poorly shielded equipment and interfere with the internal
circuit of the machine to generate interference noise. Practice has shown that
in some special occasions, such as studios where a large number of thyristor
dimming equipment is used, if reliable shielding and grounding measures are not
taken, the noise will be very serious.
4. Ground loop noise
In a professional audio system, the entire system must be well grounded,
and the grounding resistance must be less than 4 ohms. Otherwise, the induced
charges generated by the equipment in the professional audio system due to
various radiation and electromagnetic induction will not be able to flow into
the ground, resulting in a noise voltage superimposed on the audio signal.
If there is a ground potential difference between the ground wires of
different devices due to the difference in ground resistance, or there is a loop
in the internal ground of the system, ground noise will be caused. When two
different professional audio systems are interconnected, noise may also be
generated. The noise is caused by the direct connection of the ground wires of
the two systems.
4. Circuit noise inside the device
Professional audio equipment has an indicator-signal-to-noise ratio. Due to
the electrical noise generated by the internal electronic components, when one
device works alone, the required index can be achieved, but when multiple
devices are cascaded, the noise will accumulate and increase. In practical
applications, some low-grade civilian audio equipment will have a lot of AC
noise due to poor internal power supply filtering, which will sometimes cause
serious noise in professional audio systems.
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