source:Industry News release time:2021-09-14 Hits: Popular:Brand bar audio wholesale
Analysis of noise problems in professional audio systems
In a professional audio system, there are generally many equipment used, from professional to civilian. Different equipment has different interface methods, and the connectors used are different, from balanced. There are also balanced inputs. Output method. In order to effectively shield the interference of external electromagnetic radiation, it is necessary to use shielded cables and choose the correct connection method. We know that when the balanced transmission method is used for audio signal transmission, the external interference source affects the two cables in the balanced cable. The common mode interference level of each signal line is almost equal to the ground loop. At the input end of the internal amplifier of the device, the common mode voltage drop on the two signal lines is replaced by a differential mode voltage to cancel each other, which constitutes interference. Voltage, so balanced connection methods should be used as much as possible.

When connecting with some unbalanced output devices, most of them are now mostly in order to save costs, convenience and labor, directly use single-core shielded cables to connect the balanced ports and sub-balanced ports, instead of using a balanced or unbalanced variator. This kind of connection shielding layer is also in the audio loop. The noise induced by the shielding layer is also mixed into the audio signal, and then the noise is added. This will be the main way to introduce noise. The correct way is to do both balanced and unbalanced transmission. Two-core shielded cables are used, and the shielding layer is only grounded at one end of the balanced output or input.
When both ends are unbalanced devices, if the transmission distance is large, it is best to use a balanced-unbalanced converter or audio blocking transformer to convert to balanced transmission.
The connection of current professional audio equipment covers the selection of voltage jumper methods. They all comply with the IEC268-15 specification when they leave the factory, that is, the line output of professional audio equipment is ground resistance output, and the line input terminal as the load is selected For high-impedance input, in addition to the connection between the power amplifier and the speaker, there is generally no need to specifically consider the impedance problem.
Popular recommendation
A2 Dalian Bar Audio Vendor
2021-07-26Dance Stack Overview Car stereo Factory
2021-07-16Resolution 5E Big sound bar Vendor
2021-07-16F1201 School audio Vendor
2021-07-16Resolution 4S Skeletal Bar use audio Vendor
2021-07-16SB 210A Bar brand audio Vendor
2021-06-08Evolution 7E Sound bar Merchant
2021-07-16EVO 7THBar sound company
2021-07-17Resolution 1.5TT Marten Audio company
2021-07-16F218 Mk2 Learning audio Vendor
2021-07-14I3PR Car stereo manufacture
2021-07-26D2 AMPS Bar speakers wholesaler
2021-07-26How to choose the right video conference system solution.Kunming Bar Audio Factory
2022-07-12Introduction to audio-the principle of better matching of audio amplifiers.Bar sound engineering Ven
2021-11-16Zhuhai Wildcat KTV Special Audio--Mateng Audio
2022-05-16What are the main stage audio equipment and what are they!Marten Audio Vendor
2021-11-01Professional audio intelligent system knowledge!Sound bar Vendor
2021-10-22What kind of sound is popular now?
2022-03-25Analysis of the Effect of Linear Array Sound System Debugging on Stage Atmosphere
2021-09-25Zunyi FIRST ROOM bar sound system provided by Mateng Audio
2022-11-17Talking about the key elements of optimizing stage sound effects!Speaker bar Vendor
2021-10-27Tongxiang Internet Red Bar SPACE Special Audio--Mateng Audio
2022-04-11How to match audio equipment with audio amplifier.Gymnasium audio wholesale
2021-12-28Shanghai MASTER popular nightclub professional audio is provided by MASTER Audio
2022-07-13