Waves IR-360, IR-L, IR-1 manual Introduction, Synthetic Digital Reverberation

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Introduction

The Waves IR-1,IR-L and IR-360plug-ins create extremely high quality replicas of acoustical spaces and synthetic reverbs. They also allow the user to alter many aspects of the sound of these reverbs.

For the purpose of this Manual, when discussing attributes shared by the Waves IR-1,IR-Land IR-360Parametric Convolution Reverb plug-ins, we will simply refer to them all as the IR-series.

Overview

The Waves IR-series are convolution-based reverb processors. They give the user total control of a reverb's properties. Impulse Response Convolution is the process of forcing a certain acoustic signature on any incoming audio signal. An Impulse Response (IR) is created by feeding a very short pulse (Impulse) into a linear system and measuring the resultant output (Response).

Synthetic Digital Reverberation

Historically, most digital reverberation processors have used a synthetic reverberation engine for high efficiency. This would usually consist of two reverberation generators:

•The Early Reflections Generator. This generator is based on a short Finite Impulse Response (FIR) filter with less than 100 reflections. A short stage of convolution is performed with this FIR.

•The Reverberation Tail Generator. This is based on a recursive Infinite Impulse Response (IIR) filter. The IIR comprises a feedback loop with a decay factor and inner dispersion filters. It makes the reverb more complex, less resonant, and more rich and natural sounding.

The tail generator is efficient. It can generate a one-second reverberation time or a five- second reverberation time using the same amount of processing power. Such reverbs usually allow a great deal of control over the reverberation properties. These controls have become classics. They include Reverb Time (RT), Predelay, Size, High and Low Frequency Damping, and Diffusion.

Typically, the goal for using a reverb is to emulate the acoustics of natural spaces such as rooms or halls, or to add "wet" reflections to "dry" sources for creative and aesthetic reasons.

Examples of these reverb processors include the Waves TrueVerb and Renaissance Reverb.

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Contents User’s Guide Table of Contents Waves IR-1 software guide page 3 Introduction Synthetic Digital ReverberationSampled-Acoustics Convolution Reverberation Perfect HybridImpulse Responses IR LibraryPage Sampled Acoustics Virtual Acoustics Devices and SyntheticImport Impulse Response from File… Import Sweep Response from File…Tips for Sampling an Acoustic Space SET-UP Page Channel Configuration # of Convolutions About the IR-360Waves IR-1 software guide page 13 Waves IR-1 software guide page 14 Waves IR-1 software guide page 15 About the IR-L Reverb Time Latency Offline Calculation indicator IR-1AND IR-360 Controls and Displays Reverb Time Reverb Control Parameters Wet Properties Direct Signal Reverb Tail Latency Reverb Envelope Offline Calculation Indicator More about Reverb Damping Reverb EQ High Shelf Filter This control is only available in the Efficient components IR-360 Controls Toolbar WaveSystem ControlsLoading Impulse Responses Saving Importing Impulse ResponsesIR Info and Properties Page System Requirements CPU Mode Switch IR-1 Htdm
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