A Bass Sound Frequently Asked Questions;
Qshould be a common failure of sound cards and speakers. The main performances are silent, small sound, only one speaker sound, sound tone, sonic boom, buzzing, etc. The main reasons for this failure are mute, low volume, and sound card. Drive problems, speaker damage, sound card module damage, BIOS setup issues, sound card conflicts with other devices, poor sound card contact, sound card damage, etc.
A How do sound current sounds - Sound noise processing methods;
QSource noise problems often plague us. In fact, as long as careful analysis and investigation, the vast majority of acoustic noise can be resolved. Here's a simple analysis of the causes of acoustic noise, as well as self-discovery methods that can be used by newcomers when needed. Incorrect use of audio may result in noise, such as signal interference, bad interface or cable connection, poor audio quality, and so on. In general, acoustic noise can be roughly classified into electromagnetic interference, mechanical noise, and thermal noise. For example, active audio amplifiers, transformers and other components are placed together inside the speaker itself, and noise generated by mutual interference is inevitable. In addition, many acoustic noises are caused by poor contact or short circuit between the signal line and the plug, and maintaining the excellent contact performance of each connector is a necessary condition for ensuring the normal operation of the audio. For example, some continuous beeps are basically the problem of signal lines or plugs, which can be solved by means such as swapping satellites. Here are some other sources of noise and how to deal with them. Electromagnetic interference noise sources and treatment methods Electromagnetic interference can be divided into power transformer interference and spurious electromagnetic interference. This noise often appears as a small buzz. In general, the power transformer interference power due to magnetic flux leakage caused by the multimedia speakers, under conditions permitting the installation of the transformer shield effect is obvious, will be the greatest degree of magnetic flux leakage barrier, only iron shield Type material production. We should try our best to choose big brands and solid materials. In addition, using external transformers is also a good solution. Spurious Electromagnetic Interference Noise and Disposal Methods Spurious electromagnetic interference is common, and speaker wires, crossovers, wireless devices, or computer hosts can become interference sources. Keep the main speakers as far away from the host computer as possible, and reduce the number of peripheral wireless devices. Mechanical noise processing methods Mechanical noise is not unique to active speakers. In the working process of the power transformer, the vibration of the iron core caused by the alternating magnetic field will produce mechanical noise, which is very similar to the buzzing sound produced by the fluorescent lamp ballast. Choosing good quality products is still the best way to prevent this noise. In addition, we can install a rubber shock absorber between the transformer and the fixed plate. It should also be noted that if the potentiometer is used for a long time, there will be poor contact between the metal brush and the diaphragm due to problems such as dust accumulation and wear, and noise will occur when rotating. If the speaker's screw is not tightened, the inverter tube will not be handled properly, and mechanical noise will be produced when playing large dynamic music. This type of noise generally manifests as a Karaoke noise when adjusting the volume using the volume or bass/knob knobs. Dealing with this type of thermal noise can be accomplished by replacing low-noise components or by reducing the component's workload. In addition, reducing the operating temperature is also one of the most effective methods. In addition, some computer speakers, when the volume is adjusted too loud, there will be noise. This is due to the fact that the power output of the amplifier may be too small to avoid the large dynamic peak signal at the moment of the music or due to the speaker overload distortion. This kind of noise is characterized by a hoarse voice, although loud, the sound quality is extremely poor, the sound is dry, the treble is rough, and the bass is weak. At the same time there are indicators that can be seen with the beat of the music, the indicator light will flicker, this is because the overload circuit power supply voltage is caused by a serious pull down.
A How to reduce the power transformer's interference to the audio amplifier circuit;
QPower transformers can interfere with amplifiers through magnetic fields, electromagnetic induction, and circuits, and are the largest sources of interference in audio equipment. Therefore, it is necessary to properly handle its working conditions and application environment in order to effectively avoid the interference generated by the power transformer, so that the amplifier has excellent sound effects. I will discuss this with everyone here. 1. In addition to supplying power to the amplifier, the power transformer can also couple the amplifier and the power supply, allowing the interference source in the power grid to enter the amplifier, and also reflecting the voltage and current changes generated by the amplifier into the power grid. In order to cut off the electrostatic field and capacitive coupling between the windings, isolation and common mode are used to suppress the resulting interference, avoiding the coupling of the common mode voltage in the power grid or circuit to the secondary or primary, plus the winding of the audio power transformer. Faraday electrostatic shielding is critical. This kind of shielding can be alternating copper foils between layers, or it can be a complete joint structure. In general, the more the windings (especially the primary windings) are surrounded, the better the common mode suppression is. 2. The magnetic field interference generated by the power transformer has always been a problem that plagues the quality of the amplifier. Even if there is a pure power source, magnetic field induction from it can also cause serious degradation of the amplifier quality. Since magnetic shields are expensive (even higher than the transformer itself, which is why some imported transformers are expensive), magnetic shields are rarely used in general domestic machines to cut off the magnetic interference of transformers, and many use only simple iron. The shield is isolated, or even the transformer is barely installed, so effective magnetic shielding cannot be performed. Foreign high-quality transformers often use a multi-layer manganese tourmaline and blister copper layer structure and enclose the transformer. On the one hand, the manganese alloy is used for high magnetic resistance and high magnetic permeability for magnetic short-circuiting. On the other hand, it is caused by copper layers. The eddy current produces a magnetic field that counteracts the magnetic field of the interference and cancels the magnetic interference, thereby greatly reducing the magnetic field leakage of the transformer. It is difficult to obtain a manganese tourmaline cover under amateur conditions, but it is also possible to use a 1.5 mm soft iron plate and a copper plate to make a multilayered magnetic shield. 3. When the primary impedance of the transformer is equal to the parallel value of the source resistance and the reflection resistance of the load, the low frequency cutoff will occur, increasing the noise from the transformer, so the power transformer must also have sufficient inductance. However, this does not justify blindly increasing the output power of the transformer. Because the primary inductance of the transformer changes with the magnetic flux density of the core, when the secondary load power is small, the magnetic flux density of the iron core also decreases and the inductance decreases. In general, the power transformer power can be selected between 1.4 and 2 times the secondary power supply, more appropriate. 4, high-quality transformer core magnetic permeability is high, the magnetostrictive effect is also very high, the external magnetic field, pressure, vibration sensitive, it can generate additional voltage, causing interference. To do this, when assembling or installing the transformer. Take the following measures: - Demagnetize before core or shield assembly. - Avoid shorting the core, generate eddy currents, reduce the magnetic flux, and reduce the inductance. - The transformer should be vacuum impregnated so that the laminations cannot move with each other. — The transformer must be mounted on a shock-absorbing base. Any magnetic field source must also be installed in a vibration-damped manner. - If the installation space permits, the transformer should be acoustically isolated. 5, the form of the transformer is also very important to reduce interference. In general, the ring-type or O-type transformers have high efficiency and low leakage flux, but the magnetic flux is apt to be saturated, which is not conducive to resisting the interference of the power grid. The EI type is the opposite, and because there is a certain air gap, the magnetic permeability of the iron core can be stabilized. R-type is between the two. Because China's power grid pollution is more serious, many "fans" have chosen EI-type transformers as audio power.