Insertion Loss

The Music Telegraph | Text 2019/07/09 [12:59]

Insertion Loss

The Music Telegraph| 입력 : 2019/07/09 [12:59]

▲ Low Insertion Loss semi-rigid SMP cable assembly

© Winchester Interconnect

 



Insertion Loss

The use of constant voltage transfer designed circuitry allows us to design a patching system that would permit any output to be connected to any input with minimal signal (voltage) loss. The system works well because manufacturers design their equipment to have a low impedance output and a high impedance input. However, there is no industry regulation that says exactly what those impedance values must be. In addition, even when a designer specifies an impedancevalue, component and manufacturing tolerances may make that actual value vary from the design specification.

 

When you have a situation where you are connecting different pieces of equipment together that all have some degree of variation in their output and/or input impedance, you will have variations in the amount of signal that will be transferred from one device to the other. Further, that signal level will be different when you change the patch arrangement or switch to another piece of equipment.

 

Level changes due to the small mismatches between input and output impedance of professional equipment are not of much concern, usually less than 1 dBv. This amount of change cannot be heard by the human ear (we need at least 6 dB of voltage change to become aware of a level change), but they could make a difference to processing devices that are level dependent (compressors, expanders, spectral enhancers, etc.). Therefore, it is important to know what will happen to the signal from a device when you patch it into another device. 

 

The level change that occurs in an output device when you patch it into an input is called 'insertion loss'.

 

 

 

 

 

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