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Working with output zones is nothing new. All audio systems have them. You've no doubt configured them countless times. But we can state with confidence that it's unlikely you've ever configured an output zone as quickly as you can in the HAL System. Read on to learn about another of the HAL System's many time-saving shortcuts—the Zone Processor block!
The HAL System Zone Processor handles output zones. "Great!" you say. "But what exactly does handle mean?" To fully understand the power of this block, let's first review the typical things you would do when creating an output zone. You would:
With the exception of the last item on this list (configuring emergency paging), the HAL System Zone Processor streamlines all of these tasks and minimizes the hands-on configuration needed to get an output zone up and running. At its simplest, all you need to do is drop a Zone Processor block into your system, wire in the zone's local inputs, add optional post-processing, and connect to the appropriate output(s).
The Zone Processor automatically includes a connection to the Distributed Program Bus (which provides pre-configured inputs to the zone), a connection to the paging system (including ducking), level control for the zone, and source selection (although to provide remote control over the volume and selection, you need to link to a DR or other remote device).
Although the HAL System Zone Processor takes care of many tasks for you, there are typically a few things you'll need to think about and configure. See the next question for a detailed discussion of the Zone Processor's contents and a closer look at how the Zone Processor works.
Following is an image of a Zone Processor block:
As you can see, it contains a blue box titled Distributed Program Bus and a green box titled Zone. It also contains Input node(s) and an Output node. Let's examine each of these items:
Contained inside the Zone Processor are additional processing blocks that you can configure. To access these blocks, double-click the Zone Processor block. Following is an image of a Zone Processor's contents:
As you can see, the Zone Processor contains three connected processing blocks: a Priority Selector block, a Level block, and a Paging Zone block. Each of these blocks serves an important function for the zone, as detailed below. The order in which the blocks are connected is also important, with the placement of the Level block before the Paging Zone ensuring that a page is audible regardless of the volume setting for the zone's output. Automatically including these blocks and connecting them appropriately is yet another Zone Processor feature that simplifies your design process!
The purpose of this block, which includes all of the zone's audio input (including the Distributed Program Bus channels), is to designate which of the zone's input(s) have higher priority when audio is coming in from more than one of the input sources. For example, a large 50's theme restaurant plays background music from that era, but its bar also contains a jukebox from which customers can pay to hear a specific song. When a customer drops their quarter in the jukebox, one would expect the background music to stop and the customer's song selection to play. The Priority Selector block makes it possible to automate this behavior. By giving the jukebox input a higher priority than the background music, the HAL System, when it detects a signal from the jukebox input source, knows to give that input source precedence and make it the active selection. When the jukebox stops sending a signal, HAL returns to the background music input source.
In addition to input priority settings, the zone's Priority Selector block contains the zone's input selection control which you can link to a DR (or other remote hardware device)—to give your end users control over the zone's audio selection. You can also use this block to configure a number of detector settings for the input: Threshold, Low Cut, High Cut, Hold, and Ramp Back. To access the block's properties, simply double-click it or hover over its title bar and click the properties icon that appears in the upper right corner.
The Zone Processor Selector block is virtually identical to the standalone Priority Selector block available in the Selectors category in the DSP palette. The only difference is the inclusion of the Distributed Program Bus inputs in the Zone Processor Priority Selector block.
Use this block to configure the Level properties for the zone's inputs and to create a link to a remote device for end user control of the zone's input volume. To access the block's properties, simply double-click it or hover over its title bar and click the properties icon that appears in the upper right corner.
The Level block in the Zone Processor is identical to the generic HAL System Level block. It is included here as a convenience and to guarantee its proper placement in the zone's audio route. Designers sometimes mistakenly place the zone's input level control to the right of the paging output which results in inaudible pages when the input's volume is turned way down.
As previously mentioned, using a Zone Processor gives you an automatic connection between that zone and HAL's paging system. The inclusion of this Paging Zone block provides that connection. Use this block to configure page ducking and adjust the page gain setting. To access the block's properties, simply double-click it or hover over its title bar and click the properties icon that appears in the upper right corner.
As with the other internal Zone Processor blocks, this block is identical to the generic Paging Zone block.
When to use a Zone Processor is a simple decision. Do you plan to use a Distributed Program Bus in your system? Are you also setting up paging? If the answer is yes to either of these questions, you should likely use one or more Zone Processor blocks! Although you could build your own zone processing functionality using individual processing blocks, why would you want to? Using a Zone Processor block saves you time and gives you automatic connections to your Distributed Program Bus and paging system. In fact, if you plan to use the Distributed Program Bus, the only way to actually include its channels in your system is via the Zone Processor (unless you're creating a room combine—see note below).
note: If you're designing a system for a room combine, you'll be using the Room Combine Processor block, which also includes an automatic connection to the Distributed Program Bus and the HAL paging system. In this situation, you would use the Room Processors (included in the Room Combine Processor block) instead of Zone Processors. See About Room Combine for details.
So how many Zone Processors do you need? As you are probably very experienced with configuring zone processing functionality, you know what constitutes a zone. But just in case you're wondering, here's a little refresher.
A single Zone Processor can cover any area that has the following features:
As soon as an area's audio or paging needs differ from another area, that's your signal that you need a new Zone Processor.
Have we mentioned that the creation of a Zone Processor is an easy process?! To add a Zone Processor, you simply drag it from the DSP palette (the block is located in the Paging/Room Combine category) and drop it into your Processing Map. For the detailed procedure, see Creating a Zone Processor.
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