An introduction to computer audio
Digital Room Correction is using a processor to correct the interaction between the speakers and the room.
Proper DRC requires measuring the response using a calibrated microphone at the listening position.
This measurement is used to generate a target curve, one that compensate for the amoralities caused by the interaction between room and speakers.
DRC is a program used to generate correction filters for acoustic compensation of HiFi and audio systems in general, including listening room compensation. DRC generates just the FIR correction filters, which can be used with a real time or offline convolver to provide real time or offline correction. DRC doesn't provide convolution features, and provides only some simplified, although really accurate, measuring tools.
If you are currently using a computer to serve up your music, you may be interested in trying digital room correction. I've been using correction for many years. I've tried a number of digital room correction software and hardware solutions, ranging in price from free to many thousands of dollars. While I am currently using a hardware solution, a very effective solution is the free and open source DRC package. Unfortunately, DRC is quite difficult to learn to configure and use effectively.
A few months ago I started spending some free time writing software to make the process of creating impulse responses and digital correction filters easier with DRC. Basically the program is a graphical interface to the impulse recording and filter creation process. You can record impulses at different sample rates and easily create the standard filters that some with DRC, but also create filters suited to your tastes with the customized filter feature. The program will automatically create the configuration files to load filters in convolver VST, which is also included in the release (as well as DRC). The program currently only works under Microsoft Windows but I am planning on releasing a Linux version when I am happy with the Windows version.
Digital Room Correction Designer was created to ease the process of creating and loading room correction filters for use with two channel stereo systems. DRC Designer includes Denis Sbragion's DRC for creating room correction filters, John Pavel's Convolver VST for playing music through the filters, and Simple Automated IR Measuring Tool by Denis Sbragion and Edward Wildgoose for creating the impulse response files needed by DRC.
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You can do a lot with Acourate
Mitcho has an excellent walkthrough.
We are confident that Audiolense is at the forefront of audio correction. The verdict from those who have moved from competing solutions have been positive - and the verdict from those who didn't have prior experience with advanced sound correction have been overwhelming since the early days. That includes Audiolense XO - our high-end offering with True Time Domain correction as well as our entry level offerings Audiolense 2.0 and Audiolense Surround - that both utilizes a very good frequency correction.
Source: Juice HiFI
Ultimate Equalizer (UE-PC). The UltimateEqualizer is a much enhanced, and completely free-standing version of the UE dialogue box built-into SoundEasy V17, and some concepts have been developed in collaboration with Music and Design. The UE consists of the following main blocks:
The UE includes inverse-HBT equalization, time-inverse processing that eliminates phase distortion, crossover filtering, and partitioned convolution. Equalization of the individual drivers’ response to the user specified acoustic target is performed automatically with the click of a button. The outcome is a transient perfect speaker system with flat amplitude and phase responses that faithfully reproduces any input signal relative to the design point, as demonstrated by the ability of the speaker system to play undistorted square waves. Shelving and notch filters are included to voice the speaker to other than ruler flat response and the time-inverse processing and be switched on or off as desired. Recommended sound card is MME/WDM compatible 2-in/8-out sound card. Many functions will look familiar to SoundEasy users, but you will find them simplified, with better GUI. This stand-alone, fully self-containing program includes ALL functions, that you need to create your "DSP-on-PC" system. Latest release of the UE-PC incorporates 5.1 Home Theatre option
Source: Bodzio Software