Processing and Control for Professional AV Installations
Legacy Hardware

6200 Voice Processor

The AirTools 6200 Digital Voice Processor is designed to meet the increasingly sophisticated needs of broadcasters operating in both analog and digital realms featuring an optimum mix of signal processing modules and control features. The modules include: highpass, lowpass, and shelving filters, de-esser, downward expander, comp-limiter/AGC-leveler, 4-band parametric EQ and voice symmetry. The 6200 is a dual-channel unit with two discrete audio pathways capable of processing microphone or line-level sources, independently or as a stereo pair with a 24-bit/48 kHz digital signal path. Creation of voice programs and signal processing parameters may be done from the 6200 front panel or from 6200 Designer, a Windows® application (provided). From a PC, the 6200 may be controlled via RS-232, USB or Ethernet. In lieu of computer control, real time changes of program and DSP parameters may be actuated via user supplied ESE time code, pots, encoders, switches, or MIDI devices.


6200 Designer runs on a Windows PC and is used to configure, design and control the 6200 Digital Voice Processor. Firmware for the 6200 is included and upgraded through 6200 Designer.


We are aware of a small problem with the 6200 Designer software that, under certain (though uncommon) circumstances, results in dropping offline when the 6200 hardware is connected via Ethernet.

The two scenarios under which we are able to duplicate this problem are:

Network saturation (for example, CobraNet traffic):
By sending a large volume data such as broadcast CobraNet audio (multicast bundles) onto the same subnet as the 6200 and PC, we were able to make the unit drop off-line within a few minutes.

Using a repeater hub and deliberately adding network traffic:
Using a hub, it is possible to flood the 10 Mbit Ethernet port on the 6200 with more data than it can handle. We found we could force it to drop offline by one of the following methods: copying a large file from a network server to the PC running 6200 Designer; or by opening a remote desktop connection to the PC running 6200 Desginer (sending data-intensive screen updates); and using Windows Update utility while starting a transfer.

Most Ethernet “hubs” today are actually switches. The difference between a repeater hub and a switch is that a repeater hub sends traffic received at one port out to all other ports, whereas a hub intelligently looks at who the packet is intended for and sends it out to only the appropriate port(s). This is important because with a repeater hub, it is possible to have a collision that subsequently requires a retry. This will not occur when using a switch. (It is actually quite difficult to buy a repeater hub today, since switches are a superior technology and are replacing hubs in most manufacturers’ product lines.)

There is a known bug in 6200 Designer where after configuring the Hardware Settings (found under the Unit menu in 6200 Designer) and then clicking the done button, the settings are not saved in the unit. The work around for this bug is quite simple: Click the Windows Close Box (the “X”) in the upper right hand corner of the dialog instead of clicking the “Done” button. This will write the hardware settings to the unit.