Ask the Doctors
Wiggly Frequency Response and the Cooper Time CubeMay 27, 2009 11:11:11 AM PDT
The Cooper Time Cube is famous for its spectacular short delay and doubling effects, and its uncanny ability to always sit perfectly in the mix. The Cooper Time Cube plug-in’s delay element has a rather “wiggly” frequency response. The high-frequency and large-scale, low-frequency variations are modeling hardware frequency responses that are largely due to the characteristics of the transducers and the cavities in which they sit.Read More
The UAD 4K Channel Strip and Buss CompressorApril 22, 2009 11:11:11 AM PDT
The UAD 4K is an emulation of the SSL 4000 channel strip, which comprises high and low cut filters, four-band EQ, compression, and expansion/gating. The buss compressor is modeled after the SSL 4000 buss compressor. It features feedback topology, VCA-controlled gain, a wide range of attack and release times, and an “Auto” release mode with program dependence. Compression ratios are also selectable.Read More
33609 WarmthMarch 25, 2009 11:11:11 AM PDT
Q: Does the Neve 33609 plug-in include a model for saturation in the circuit, or is the signal distorted only due to the action of the compressor?
A: There has been much debate among users on this topic. The 33609 plug-in does model distortion in the audio path separately from distortion caused by gain modulation.Read More
Total Harmonic DistortionJanuary 21, 2009 8:00:00 PM PST
Q: What is THD and how is it measured?
THD stands for Total Harmonic Distortion and can be used to estimate the degree to which a system is nonlinear. A THD measurement can be made by applying a sine wave as an input to a system, and measuring the total energy which appears at the output of the system at harmonics of the input frequency.Read More
Flangers and PhasersDecember 24, 2008 11:11:11 AM PST
Q: What is the difference between a flanger and a phaser?
A: Flangers and phasers are fundamentally the same thing: an element that creates time-varying phase delay, surrounded by feedback. Figure 1, below, shows a block diagram for a flanger or phaser. The phase-delay element can be viewed generically as an all-pass filter; this element is a linear system that has unity gain at all frequencies.Read More
Allpass FiltersNovember 19, 2008 11:11:11 AM PST
Q: What are allpass filters and what are they used for?
A: Allpass filters are filters that have what we call a flat frequency response; they neither emphasize nor de-emphasize any part of the spectrum. Rather, they displace signals in time as a function of frequency. The time displacement accomplished by an allpass filter is specified by its phase response.Read More
Circuit Emulation in SoftwareSeptember 24, 2008 11:12:11 AM PDT
Emulation of continuous-time systems can be broken into two distinct problems. First, a model must be constructed that characterizes the system suitably; second, a discrete-time implementation must be created that will faithfully represent the model. Depending on the system to be emulated, either the first or second part of the process can be the more challenging. We will treat the two parts separately here.Read More