320A

6. Operation

Compellor

numerous other devices which effectively control the level differences, but none have the transparency of the Compellor. These other devices, particularly multiband compressors and limiters, have a ‘sweet spot’ which renders the best results. Adjust the Compellor so that its output is driving the downstream processors at their sweet spot.

6.9 Broadcast STL/ Phone Line Driver

The aural STL’s and phone lines have limited dynamic range. It is advisable to do processing in front of those links so that they are not overloaded or driven so lightly that there is too much noise. Set the Compellor for 12dB of gain reduction, Process Balance at 11 o’clock, Leveling Speed ‘slow’, Limiting ‘in’, Stereo Enhance ‘in’ and Leveling Link ‘in’.

6.10 Television Broadcasting and Cable Systems

The single biggest complaint generator from viewers is the apparent level difference between commercials and program. The differences may be even more exaggerated when there are local inserts into national feeds. Commercials are processed to have low peak to average ratios. So even if the peaks of the commercials are the same as the program peaks (as would be measured on a modulation monitor) the average levels are higher, causing the apparent loudness difference.

The Compellor recognizes the differences in density and adjusts it release times based on the peak to average ratio of the input. If an input is already heavily processed (e.g.- a com- mercial), the Compellor slows its release time. When the Compellor sees a very high peak to average ratio (e.g.- a live news broadcast) it speeds its release time. Segues between program and commercials are much smoother.

Another complaint made to cable systems is the difference of levels channel to channel. If each channel of a cable system has a Compellor and all the Compellors in a cable system are set similarly, channel to channel differences will be eliminated.

6.11 Video and Audio Tape Duplication

The dynamic range of most tape formats is usually much less than the original source mate- rial. In addition, the usable dynamic range of the playback medium of duplicated tape is usu- ally less than that of the original (e.g.- video tape copy of a theatrical release). The Compellor will automatically control the dynamics of the original without losing the impact and artistic intent of the original.

The Compellor is also useful when assembling a single tape from multiple sources. The level differences between the sources are automatically smoothed out, obviating the need for stu- dio time to level adjust each source before mastering.

6.12 Voice Processing

The human voice is the most difficult signal to process. We may not know what that drum sounded like originally, but we all know what a human voice sounds like. Processing artifacts are therefor much more noticeable on human voices.

Consonant recognition is a critical part of intelligibility. If the processing is not done correctly, the consonants will be ‘crushed’ causing the loss of intelligibility. The Compellor effectively controls the levels without loss of intelligibility, indeed because the levels are more controlled, the intelligibility will be enhanced.

It is recommended that Leveling Speed be set for ‘fast’ when processing voices.

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Aphex Systems 320A Broadcast STL/ Phone Line Driver, Television Broadcasting and Cable Systems, Voice Processing
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320A specifications

The Aphex Systems 320A is a dynamic processor designed to enhance the quality of audio recordings in professional settings. Known for its exceptional performance and versatility, the 320A offers a unique combination of compression, limiting, and expansion functionalities. This unit is an essential tool for sound engineers and producers looking to achieve polished sound.

One of the standout features of the 320A is its dual channel processing capability. This allows users to apply dynamic processing to two separate audio signals simultaneously, making it ideal for stereo or dual mono setups. The 320A offers a range of controls, including threshold, ratio, attack, release, and gain, allowing precise adjustments to be made according to the needs of any project.

The 320A utilizes Aphex's proprietary Intelligent Clipping technology, which helps to prevent distortion at high signal levels. This feature is particularly beneficial when working with dynamic sources like vocals and percussive instruments. Intelligent Clipping ensures that the audio remains smooth and clear, even when processed aggressively.

In terms of connectivity, the Aphex 320A is equipped with balanced XLR and TRS inputs and outputs, ensuring compatibility with various audio sources and devices. The unit supports both line-level and mic-level signals, providing flexibility for different recording scenarios. Additionally, its low noise operation ensures that the final output retains pristine audio quality.

Another significant characteristic of the 320A is its user-friendly interface. The front panel features easy-to-read meters and clearly defined controls, making it straightforward for users to monitor the audio levels and adjust settings in real-time.

The 320A also includes a sidechain capability, allowing users to trigger compression or expansion from an external source. This feature is useful for achieving effects like ducking or creating rhythmic dynamics in a mix.

In summary, the Aphex Systems 320A is a feature-packed dynamic processor that serves as an invaluable tool for audio professionals. With its dual channel processing, Intelligent Clipping technology, flexible connectivity options, and user-friendly design, the 320A stands out in the realm of audio processing equipment, delivering high-quality performance for a variety of recording and mixing applications.
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