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The problem of noise active speakers
Generally speaking, active speakers will exist inside, so noise amplifier, so say "inevitable" zero noise that belongs to the ridiculous. According to sources of noise active speakers can be roughly divided into electromagnetic interference and noise interference, mechanical ground and thermal noise, let's make a brief analysis of the causes of the noise.
Electromagnetic interference:
Electromagnetic interference can be divided into power transformer electromagnetic interference and stray. Generally speaking, multimedia speakers often use EI type, type or R transformer.
Ring transformer nonexistent gap and coil, theoretically radiation leakage magnetic field will rarely. But this power transformer relatively higher requirement of environment, if we use the waveform distortion of light, use annulus transformer effect even as EI type, so we will supply to their place of work environment. R transformer and the magnetic leakage of similar, the author here longer expatiatory.
Simply analyzed reasons, we can solve the problem of the targeted. In the conditions allow for transformer with shields, the effect of maximum can be shielded enclosure, magnetic flux leakage block only with iron type materials. Generally speaking, we should try to choose a big brands, the materials of the product, if the solid core transformer materials such as copper, iron, inferior quality of transformer loss and damage will be more serious, copper in the idle current transformer, then magnetic flux leakage phenomenon will be more apparent, in addition, use external transformer is also a good idea.
Stray electromagnetic interference and ground:
Stray electromagnetic interference is common, the speaker wires, prescaler, wireless equipment or mainframe computers will become sources. The speaker will allow conditions as far away as possible, and to reduce host computer peripheral wireless devices. Additionally, some users will sound and computer linked to lead an audio interface, and beside the USB interface insert a bluetooth device to the extent that the electromagnetic interference can also cause, if the user does not often change audio equipment, the proposal will be inserted on the main line of the audio interface on behind.
Ground interference is mainly low frequency signal circuit, the high frequency signal circuit and power circuit in which position choice not grounded interference phenomenon hum. Generally speaking, the high ground without using ring, and low frequency is wired grounding wire, centralized independent follow the principle of ground. Actually, we do not use such interference, the influence of the grounding in the circuit design belongs to the basic knowledge, big brands of products not appear this kind of mistakes, the author simply introduce relevant knowledge.
Mechanical and thermal noise:
Below we again for mechanical noise said. Just as its name implies, the noise from mechanical motion, the noise is also active speakers. Power transformer in the process of operation, the vibration caused by magnetic core can produce mechanical noise, this is very similar to the fluorescent ballasts have humming. Choose good quality product is still the best way to prevent the noise. In addition, we can in transformer and fixed with rubber damping layer between the plate.
There is little we should pay attention to, if use longer potentiometer, metal brushes and diaphragm between accumulation and worn by dirt poor contact problem, when rotating will generate noise. If not tighten the screw speakers, phase tube processing, playing music, large dynamic mechanical noise also can produce.
Finally, we'll get to the speaker said thermal noise. Because of our speakers are using resistor, capacitor, and transistors, IC, etc, these elements of conductive part of the presence of large amounts of free electrons, but as components of electronic temperature increases, the number of free will greatly improve the disorder, electronic movement will strengthen, the strengthening will reflect in tweeters "hiss".
We can handle this noise through replacement of low noise components or reduce work load components, in addition, reduce working temperature is also one of the effective methods.
The article sums up: generally speaking, active speakers can avoid the problem of noise, because the product structure limits, electromagnetic interference will exist only as far as possible, we choose the products and manufacturing companies in the speaker's attention away from the radiation on display, and do not let speakers in the high temperature environment. In addition, to ensure the stability in the mains, speakers use separate outlet in a certain extent, also can avoid current sound.
Generally speaking, active speakers will exist inside, so noise amplifier, so say "inevitable" zero noise that belongs to the ridiculous. According to sources of noise active speakers can be roughly divided into electromagnetic interference and noise interference, mechanical ground and thermal noise, let's make a brief analysis of the causes of the noise.
Electromagnetic interference:
Electromagnetic interference can be divided into power transformer electromagnetic interference and stray. Generally speaking, multimedia speakers often use EI type, type or R transformer.
Ring transformer nonexistent gap and coil, theoretically radiation leakage magnetic field will rarely. But this power transformer relatively higher requirement of environment, if we use the waveform distortion of light, use annulus transformer effect even as EI type, so we will supply to their place of work environment. R transformer and the magnetic leakage of similar, the author here longer expatiatory.
Simply analyzed reasons, we can solve the problem of the targeted. In the conditions allow for transformer with shields, the effect of maximum can be shielded enclosure, magnetic flux leakage block only with iron type materials. Generally speaking, we should try to choose a big brands, the materials of the product, if the solid core transformer materials such as copper, iron, inferior quality of transformer loss and damage will be more serious, copper in the idle current transformer, then magnetic flux leakage phenomenon will be more apparent, in addition, use external transformer is also a good idea.
Stray electromagnetic interference and ground:
Stray electromagnetic interference is common, the speaker wires, prescaler, wireless equipment or mainframe computers will become sources. The speaker will allow conditions as far away as possible, and to reduce host computer peripheral wireless devices. Additionally, some users will sound and computer linked to lead an audio interface, and beside the USB interface insert a bluetooth device to the extent that the electromagnetic interference can also cause, if the user does not often change audio equipment, the proposal will be inserted on the main line of the audio interface on behind.
Ground interference is mainly low frequency signal circuit, the high frequency signal circuit and power circuit in which position choice not grounded interference phenomenon hum. Generally speaking, the high ground without using ring, and low frequency is wired grounding wire, centralized independent follow the principle of ground. Actually, we do not use such interference, the influence of the grounding in the circuit design belongs to the basic knowledge, big brands of products not appear this kind of mistakes, the author simply introduce relevant knowledge.
Mechanical and thermal noise:
Below we again for mechanical noise said. Just as its name implies, the noise from mechanical motion, the noise is also active speakers. Power transformer in the process of operation, the vibration caused by magnetic core can produce mechanical noise, this is very similar to the fluorescent ballasts have humming. Choose good quality product is still the best way to prevent the noise. In addition, we can in transformer and fixed with rubber damping layer between the plate.
There is little we should pay attention to, if use longer potentiometer, metal brushes and diaphragm between accumulation and worn by dirt poor contact problem, when rotating will generate noise. If not tighten the screw speakers, phase tube processing, playing music, large dynamic mechanical noise also can produce.
Finally, we'll get to the speaker said thermal noise. Because of our speakers are using resistor, capacitor, and transistors, IC, etc, these elements of conductive part of the presence of large amounts of free electrons, but as components of electronic temperature increases, the number of free will greatly improve the disorder, electronic movement will strengthen, the strengthening will reflect in tweeters "hiss".
We can handle this noise through replacement of low noise components or reduce work load components, in addition, reduce working temperature is also one of the effective methods.
The article sums up: generally speaking, active speakers can avoid the problem of noise, because the product structure limits, electromagnetic interference will exist only as far as possible, we choose the products and manufacturing companies in the speaker's attention away from the radiation on display, and do not let speakers in the high temperature environment. In addition, to ensure the stability in the mains, speakers use separate outlet in a certain extent, also can avoid current sound.
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