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[Discountnd] Audio Isolation Protection Interface Box (2018)
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[Discountnd] Audio Isolation Protection Interface Box (2018)

Professional scene customization has changed the situation of using unbalanced lines to transmit audio signals from desktop to computer room in the past, and solved the problem of redundancy of cables in engineering at the same time.

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Professional scene customization has changed the situation of using unbalanced lines to transmit audio signals from desktop to computer room in the past, and solved the problem of redundancy of cables in engineering at the same time.

2018 Edtion


  AI180-Wl-1

  Audio Isolation Protection Interface Box 


Characteristic


-Professional scene customization has changed the previous situation of using unbalanced cables to transmit audio signals from desktop to computer room, while solving the problem of cumbersome and redundant engineering cables.

-Convert computer audio and other unbalanced signals into balanced signals to avoid noise and achieve long-distance transmission of computer and other unbalanced signal audio sources.

-Adopting shielded high-precision variable pressure equipment and a 600:600 initial stage ratio design, it effectively suppresses the impact sound of unplugging and unplugging signal lines, supports hot plugging of dynamic wired microphones, and has excellent frequency response characteristics.

Function


  1. Combining audio isolation protector and traditional audio interface, integrating the call mode call button for line switching.

  2. Eliminate potential differences caused by unequal induced potentials in audio equipment with different phase lines and grounding points.

  3. Convert unbalanced signals into balanced signals transmitted on differential Canon lines. (The former has a transmission distance of less than 20 meters, and the distance in places with severe electronic interference is shorter; the latter can reach a transmission distance of over 100 meters.)

  4. Eliminate 50Hz AC current sound in the audio system;

  5. Eliminate current surge noise when switching circuits or instruments;

  6. To achieve electrical isolation and circuit protection in professional scenarios such as signal transmission by television stations or other broadcasting institutions;

  7. The side switch function can choose to adapt input signals: TS unbalanced signal is set to lift, TRS balanced signal is set to GND.

Parameters


Channel QTY

2


Frq band

20Hz ~ 20KHz


Output signal

Banlance signal


First level ratio

600：600


Gain

1：1


Freq. response deviation @20Hz

-0.001dB（@20Hz）


Freq. response deviation @20KHz

0.0025dB（@20Hz）


Distortion @1V

0.0012%


Distortion @10V

0.015%


Loss attenuation  @600Ω

-0.5dB


Loss attenuation @10KΩ

0.1dB


Adapt input signal selectionNone.

Shield grounding selectionNone.

ATTNone.

Core transformer componentsHigh precision transformer components

Characteristic Curve


1-Frequency Response






2-THD+N vs Input signal amplitude





3- Linearity




4-Phase vs Freq.





5-THD+N vs Freq.





6-FFT

Application Scenarios


Sound equipment in different locations

In professional audio systems, the uneven length of power lines at various points of equipment leads to differences in grounding resistance, resulting in ground potential and voltage differences between devices, which can easily cause audio noise; There may also be an impact sound when the signal cable is unplugged or unplugged from the device, which may cause the interface chip of the device to be destroyed and the device to be damaged in severe cases.



LED splicing large screen

Each module of the LED screen is equipped with an independent power supply, which includes a boost circuit. For splicing large screens, because LED large screen systems contain numerous boost power sources, the ground potential of the power supply system will inevitably be unbalanced. At this time, if there is an audio system, including amplification and mixing stations, it will definitely cause sand and sand current noise. This scenario requires the resolution of an audio isolator.



Long distance transmission between the mixing console and the computer

The 3.5mm interface of a computer's unbalanced transmission output is susceptible to external electronic devices and radio interference, such as power cords. If they are close to unbalanced cables, they will produce buzzing noise. Old style non LED stage lighting (such as spotlights and dimmers) may also increase signal interference. At this point, it is necessary to add an isolator on the output side of the computer to convert unbalanced signals into balanced signals, ensuring that long-distance transmission is not affected by interference.



Between the mixing station and the broadcasting vehicle

On site broadcasting vehicles usually use diesel engines for self generation, and the power supply is based on virtual ground potential; The audio station is powered by mains electricity, and there may be a huge potential voltage difference between the two, which can generate electric current sound or impact potential to damage equipment, affecting activities and causing losses. For safety reasons, it is necessary to use audio isolation protectors to prevent current and sound noise, and to protect the mixing tables at both ends from being burned out.




Documents


《E2_GAODIMIC_Audio Isolation Protection Interface Box（AI180-Wl-1）v20190626》