OmniaSST Audio Processing Software Overview

Audio processing features

• Low-latency performance – Using an i7-class processor, latency can be reduced to just 5 ms.

• The Perfect Declipper – A unique filter, also found in our Omnia.9 and 11 flagship processors. It detects and reconstructs clipping-damaged audio (distortion caused by too loud input levels and too aggressive mastering), which is common in music.

• Delossifier – Enhances the sound of lossy encoded audio, such as MP3 and MPEG2 encoded audio.
• Dehummer – Removes constant tones such as a 50/60 Hz hum while flying.
• Lowpass Filter – The extremely steep phase linear lowpass filter can be used to cut off frequencies that cannot be transmitted, removing unnecessary signals from streaming audio, FM and AM transmission.

• Hiss Reduction Filter – A powerful hiss reduction filter that addresses the hiss while leaving adjacent content alone. Especially useful when playing older songs or other noisy content.

• Natural dynamics – Increases transients. This especially amplifies percussion instruments, creating more dynamics, giving the rest of the processing chain more to work with.

• Automatic Gain Control (AGC) – The ITU.1770-based AGC keeps the sound compliant to a defined loudness level.

• Bass harmonics – This filter increases the bass level without increasing the maximum amplitude of the bass and adds harmonics that make the bass more audible on speakers with poor bass response.

• Phase delay – Intentionally adds phase nonlinearity. Among other things, can be used to generate a more boomy bass.

• Bass in Your Face – Intelligently adds missing sub-harmonies.

• Absolute highs – Reconstructs missing highs if damaged or removed by lowpass filters.

• 2-9-Band Multiband Compressor / Limiter, x2 – OmniaSST has two multiband compressors that can be used in series. They have a very natural, pleasant and non-tiring sound. Depending on the content, they move very quickly when they need to and slowly when they can.

• Phasing Error (AZIMUTH) Correction Filter – Detects and repairs phase shift errors often present on tape recordings and some poorly mastered CDs. These phasing errors can make listening very unpleasant and can also cause severe artifacts when converting audio to mono, encoding using a lossy codec or when playing on a surround system. This filter detects and repairs such errors automatically. For FM broadcasts, this can reduce multipath distortion and improve audio quality when the radio changes to mono.

• Stereo Booster – Increases the stereo width. It can be configured not to change the overall sound content.

• Stereo to mono conversion – Converts stereo to mono without removing sounds that normally cancel during a monosom. This makes mono sound as full and powerful as the original stereo sound.

• Distortion Masking Clipper – The same clippers available in the Omnia.9sg. Now with a louder and cleaner “Rules are made to be broken” mode.

FM transmitter features

OmniaSST audio processing software is the first product to generate and decode Omnia’s proprietary μMPX™ multiplexed audio codec, allowing you to transport high-quality multiplexed FM signals over a small 320kbps data pipe, reducing the bandwidth required for MPX by 83%! Reduced data requirements mean high-quality multiplexed audio can be economically routed from an audio processor, over IP and directly to a decoding application, opening up entirely new possibilities for studio-to-transmitter connections.

μMPX contains stereo and RDS data, which can be transmitted to the FM transmitter using a good quality 192 kHz sound card. No separate hardware stereo coder or hardware RDS encoder is required.

The following FM station specific options are available:

• FM Pre-Emphasis Filter – Pre-emphasizes the sound, which is required for FM broadcasts.

• Flexible outputs – Flexible outputs mean that OmniaSST can output both the pre-emphasized and non-emphasized sound, or the pre-emphasized sound and a partially separately processed streaming sound.

• FM Stereo Encoder – The software FM stereo encoder generates a high-quality MPX signal including stereo information, which can be fed directly into an FM transmitter.

• FM RDS Encoder – The software RDS encoder makes it possible to broadcast RDS text without using a separate hardware RDS encoder.

• Composite clipper – The composite clipper in OmniaSST can squeeze out several dBs of extra loudness with the highest sound quality. The stereo pilot tone and the RDS signal are not affected by this filter, and the upper and lower sidebands are perfectly symmetrical, so the MPX signal coming out perfectly meets loudness standards.

• Itu-R. BS-412 Limiter – Required for several European countries. The BS412 limiter in OmniaSST has virtually no effect on the sound (no extra clipping, no pumping, no gain riding), but still keeps the output level at the maximum allowed.

• ITU-R SM.1268 Clipper, Multipath Clipper – OmniaSST includes a built-in software-based exciter and spectrum analyzer, which are used to analyze what the output signal will look like after FM modulation. The spectrum analyzer is fed back to the clippers in multiple stages to control the resulting spectrum very precisely, strictly adhering to and even exceeding what ITU-R SM.1268 recommends.