How To Deal With Car Audio Noise Sources And Excluded – Audio – Auto Repair And Maintenance Industry
Or replace the use of car audio sound, the sound will have a variety of noise, the noise can affect the quality and reduce the target sound, and even can not listen to the entire sound system for the noise problem, the author based on years of experience in dealing with the noise introduced sources of noise and basic troubleshooting. Related Reading: Sound do not “ring” car audio sound field analysis and orientation Sound routine troubleshooting and maintenance tips and four
A noise source Noise intrusion from the car audio system the following ways.
1, invasive power line (through the host and the amplifier power cord into the system).
2, the current through the ground (by the antenna of the ground and the amplifier ground).
3, induction by other wire harness (through the antenna and the original vehicle wiring harness induction).
4, with electrical interference (electrical speakers, motors, etc.).
1,2,3 item is to be relevant.
Second, measures to cope with noise
Generally used to deal with noise, spare parts, auto car capacitors or coaxial capacitor (to high frequency noise is particularly effective), Ecuador flow loop (inductance), LC filter, grounding wire, and diodes.
1, to deal with the noise generated by the ignition system
Check the ignition coil to the capacitor positive electrode is installed on, such as installation checks whether the reduced capacity, reduced capacity of platinum contacts easier if ablation, resulting in interference spark, need to replace the electrical capacity of 0,5 UF/400V nonpolarized capacitors .
Checking whether to use carbon ignition high voltage lines, if you use wire-type prone to interference by some radio interference is serious, it must be replaced.
Can increase the damping resistance on the noise suppression spark, with 1 megohm resistor is connected in the ignition coil output among the main high-voltage lines and reduce interference.
2, motor noise exclusion First audio equipment and signal lines away from the motor and the motor line, can be a non-polar ends of capacitors in parallel with the motor, but also the first series with two inductors, respectively positive and negative lines in the motor, then two The Promise of capacitor motors are connected to the positive and negative lines, the other end to form a filter circuit, is to absorb the carbon brush motor spark to the noise reduction.
3, no relays on electric horn noise, exclusion methods are as follows:
In one of the speaker terminals on the ground and then a capacitor.
- In one of the speaker terminals of a first series inductor, and then on the ground and then a capacitor.
terminals on both speakers were using the methods -.
speaker button in the steering wheel of a capacitor in parallel between the contacts.
4, on a relay electric horn noise, exclusion methods are the following:
Electric horn bracket and Car body Should be a good contact.
- At both ends of relay contacts, a capacitor in parallel, or contact the respective ends of a capacitor in parallel to the ground.
using the 3 methods in the and .
5, ground noise will be bad.
If the bonnet can not firmly grounded, the bonnet will become an antenna, the radiation noise generated by vehicles to ministries around the space, and the circuit from the antenna and the introduction of sound system. Bonnet with the body installed cable, the need to put contacts on the paint, traces of oil, dirt, etc. eliminated.
Engine (engine) and the body or the front wheel suspension, car body between the exhaust pipe and the body should have a good connection between.
6. Power line noise suppression: For the effective elimination of power line noise, should be close to the power amplifier installed Eritrea flow loop. If multiple power amplifiers, each amplifier should be installed near a stream lap Ecuador, because of the noise transmitted to another one from a power amplifier, so that failure of a single circle Ecuador flow.
7, on the signal line (RCA) incoming noise suppression:
Signal line should stay away from power lines and power lines were installed on both sides of the body, so to avoid the potential for interference. If the signal line layer shielding mesh, the outer shield should be connected to the chassis on the network.
In practice, many problems will be encountered, it is important to first find the source of interference, and then prescribe the right medicine to solve it, make car sound system for each program are clear and pure and perfect.
Car audio noise problem is failure, the causes and the most difficult to exclude, as a vehicle structure and more complex circuits, where the noise more easily, it should have some auto electrical and car audio knowledge, excluding Failure to handy. Remedy: First, according to the noise situation, through the principles of failure analysis and determine where to find parts, and then take a different exclusion methods. Simple shooting method, first listen to the sound of recording, tape and CD are both part of the noise, if there should check the power cord, ground, signal line traces the location is reasonable, signal the availability of loose skin is broken bond strap , power amplifier and the body should be insulated. True to the different noise sources, different measures to deal with, if the noise can not be excluded, the best area to find professional car audio shop with strong troubleshooting, in short, the best way to deal with noise is to get rid of the noise source , and then take noise abatement measures, this way to solve the noise.
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