Audio Ease Releases Altiverb Plug-In for MASReal-time sampled acoustics processor for the PowerMac G4
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August 17, 2001
Audio Ease released Altiverb, a reverb
plug-in for Digital Performer and MAS. Altiverb is a sampled acoustics processor that offers realistic one-, two- and four-channel
sampled acoustics of real halls, churches, forests, bathrooms -- and virtually any acoustic environment. Altiverb is the first native
reverb plug-in to take full advantage of Altivec, the 'Velocity Engine' co-processor that brings super-computer performance to
Apple Power Macintosh G4 computers. The result is a native reverb plug-in for Digital Performer that exceeds the performance of
recently introduced outboard sampled acoustics processors that cost as much as $10,000. Included in the release are dozens of
presets ranging from the Amsterdam Concertgebouw to the back of a Ford Transit van, all of these can browsed online and
downloaded from www.audioease.com/IR.
"Until the 21st Century, reverb units could only crudely approximate the amazingly complicated nature of real-life acoustics. What
stereo did to mono, Altiverb's sampled acoustics will do to synthetic reverbs," said Arjen van der Schoot, co-founder of Audio
Ease.
"Altiverb is a truly astonishing breakthrough in high-quality reverb technology," said Jim Cooper, MOTU Marketing Director.
"Sampled acoustics processing takes an enormous amount of DSP bandwidth, and there are only a few pieces of outboard gear
currently on the market that can do it. If you look inside them, you'll see dozens of DSP chips inside, hence their astronomical
price tag. The engineers at Audio Ease ingeniously employed the G4 Altivec processor, which is a solitary monster DSP
processor sitting inside every G4 Power Mac. In fact, it's so powerful, the Altiverb plug-in can produce up to 40 seconds of
real-time reverb decay, while the outboard 'verbs are doing about 6-10 seconds. And our careful analysis shows that the quality
is the same. Altiverb brings sampled acoustics reverb to any Digital Performer user's desktop at fraction of the cost of these
expensive units."
Altiverb provides mono-to-mono, mono-to-stereo, stereo-to-stereo, mono-to-quad, and stereo-to-quad effects, making it ideal for
surround reverb and ambience applications. All processing is done in real time, and two modes are offered: zero-latency mode
(with shorter decay times) and long decay mode.
An Altiverb preset is called an 'impulse response', which is created by firing a starter pistol or by playing a sine wave sweep from
a speaker in an auditorium, church, or other acoustic space. The resulting reverberation decay is recorded as a digital audio file.
Using a process called deconvolution, the dry source signal is then extracted from the audio file, leaving behind the exact
acoustic fingerprint of the space. The impulse response file is then placed in a folder, to make it appear as a preset inside the
Altiverb plug-in, where it can then be applied to any audio signal as real-time reverb. The result is a true reproduction of the
sound of the acoustic space. Unlike reverbs of the past, which attempt to synthesize decay characteristics, Altiverb captures the
actual acoustics of a particular environment.
Altiverb includes the Impulse Response Pre-Processor software, which allows users to sample any acoustic space, hardware
reverb, or other source to create their own Altiverb presets. In addition, users can take photographs of the place they are
acoustically sampling, and place JPG images in the same folder. Altiverb then displays the JPGs as a slideshow when the preset
is chosen in the plug-in. In addition, these pictures can show mic positions and other details of the sampled space.
For more information, visit their web site at www.audioease.com. |
