|
|
|
Home & Information
Technical Support
ADB Products
Related Products |
Technical FAQ 
Navigation:
HOME |
Technical FAQ overview
> sound
> control & patching
|
Sound Equipment - Control & Patching Systems
Patching systems
A patch system allows the various components of an audio system to be connected together and changed easily - without the need to unplug and re-connect each item every time an alteration is required.
Each item of audio equipment is connected to the patch bay, and simple link cables are used to route the audio signal from one piece of equipment to another. For example, an input microphone could be connected to input channel 1 of the sound desk, and the main left & right outputs of the sound desk sent to a compressor, before being sent to the amplifiers.
Patch bays, however, can be wired to perform in different ways.
Patch Bay Normalling
A patch bay is normalled when the top jack socket (output) and bottom jack socket (input) of a vertical pair are connected together, allowing the signal to pass through the patch bay, when no patch cords are inserted. There are three methods of normalling a patch bay: half normalling, single normalling and double normalling.
Half Normalling
When no patch cord is inserted, the signal passes from the top jack (output) to the bottom jack(input) of a vertical pair. When a patch cord is plugged in the top jack, the signal still passes to the bottom jack, allowing a parallel connection. When a patch cord is inserted into the bottom jack, its connection to the top row is broken.
Single Normalling
When no patch cord is inserted, the signal passes from the top jack (output) to the bottom jack (input) of a vertical pair. When a patch cord is inserted into either the top or bottom jack, the connection is broken.
Double Normalling
When no patch cord is inserted, the signal passes from the top jack (output) to the bottom jack(input) of a vertical pair. The connection can only be broken when a patch cord is inserted into the top and bottom jacks.
See also:
|
 |
 |