320DCompellor®
Dual Mono/Stereo Automatic Level Controller with Digital and Analog I/O
The World Standard
Since the introduction of the original Compellor in 1983, no other audio level controller has met with such success. Around the world, in broadcasting, record- ing or sound reinforcement, the Compellor is specified more than any other level controller.
Leading Aphex Technology
The Compellor circuits are totally unique. By throwing away all conventional design ideas, we created audio processing with unprecedented sound transparency, yet is exceedingly effective at controlling levels. Because our designs are patented, no other company has been able to match the performance. Algorithms like our exclusive “DVG”, “DRC”, and “FDL” have yet to find any rivals.
Unmatched Reliability
Aphex engineering and manufacturing produces products that last and last with- out need for repairs or calibration. Some Compellors have literally been in
Digital Advancements
The first Compellor was introduced in 1983 as an analog product. Because of their advanced technology, most of those older units are still in regular use. Since that time, newer models have been produced, still in analog form. Digital technology of today promises many improvements in user interfaces, and sometimes in sound qual- ity, but not in audio processing algorithms. No digital processor can match an analog Compellor for sound quality and effecive- ness. Nevertheless, many of today’s sys-
tems need a Compellor that can interface to digital audio. With the model 320D, Aphex brings you just that. You get all the advantages of the analog proces- sor with AES3 connectivity.
Compression - Leveling - Limiting:
A Very Brief Tutorial
Two properties of audio that can cause problems are the average level (the “loudness”), and unpredict- able peaks that can clip. The Compellor handles both problems for you, fitting the sound into an ideal sound envelope package.
The Compellor’s “Frequency Discriminate Leveler (FDL)” section with the “Dynamic Verification Gate (DVG)” and the “Silence Gate (SG)” slowly corrects the volume level of an audio stream with very com- plex algorithms that hide it’s work. It works differently at different frequencies, for example. It locks up when the sound stops, and resumes instantly when sound reappears. When you listen, you know the levels are made more even, but you don’t perceive the levels are shifting.
The Compellor’s Variable Slope Compressor with the “Dynamic Recovery Computer” and the “DVG” work on top of the leveling platform to add adaptable compression that helps match the texture of chang- ing audio sources. Again, you don’t hear “pumping” or other compressor artifacts. Just very natural sound that is evenly consistent in loudness.
The Compellor’s limiter acts on peaks that shoot beyond typical audio crest factors. Extremely peaky sounds will be brought into an envelope that is easy to handle by any analog or digital recording or trans- portation medium including digital codecs.
Typical Uses
Broadcast
Features
• Frequency Discriminate Leveler
No bass
• Dynamic Release Computer
Adds compression intelligently smoothing out transitions.
• Dynamic Verification Gate
adds greater transparency
• Silence Gate
Locks gain when audio stops
• Process Balance
Lets you have any combination of leveling and compression
• True Bypass
No electronics in bypass
• AES3 I/O
up to 96kHz
• Analog I/O
Fully professional balanced
• High Reliability
Famous Aphex engineering
• Stereo & Dual Mono
Use as two separate channels or linked for stereo
• Source Select
Chose digital or analog input
• Dual Outputs
Use both digital and analog outputs at the same time with either input selected
C 
US 59887
| Improving The Way The World Sounds |
S Y S T E M S | Aphex Systems Ltd. • 11068 Randall St., Sun Valley, CA 91352. Tel: (818) |
and Compellor are registered trademarks. |
